Glenn Jocher
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GitHub
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--- |
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comments: true |
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description: MobileSAM is a lightweight adaptation of the Segment Anything Model (SAM) designed for mobile applications. It maintains the full functionality of the original SAM while significantly improving speed, making it suitable for CPU-only edge devices, such as mobile phones. |
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keywords: MobileSAM, Faster Segment Anything, Segment Anything, Segment Anything Model, SAM, Meta SAM, image segmentation, promptable segmentation, zero-shot performance, SA-1B dataset, advanced architecture, auto-annotation, Ultralytics, pre-trained models, SAM base, SAM large, instance segmentation, computer vision, AI, artificial intelligence, machine learning, data annotation, segmentation masks, detection model, YOLO detection model, bibtex, Meta AI |
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--- |
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 |
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# Faster Segment Anything (MobileSAM) |
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The MobileSAM paper is now available on [ResearchGate](https://www.researchgate.net/publication/371851844_Faster_Segment_Anything_Towards_Lightweight_SAM_for_Mobile_Applications) and [arXiv](https://arxiv.org/pdf/2306.14289.pdf). The most recent version will initially appear on ResearchGate due to the delayed content update on arXiv. |
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A demonstration of MobileSAM running on a CPU can be accessed at this [demo link](https://huggingface.co/spaces/dhkim2810/MobileSAM). The performance on a Mac i5 CPU takes approximately 3 seconds. On the Hugging Face demo, the interface and lower-performance CPUs contribute to a slower response, but it continues to function effectively. |
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MobileSAM is implemented in various projects including [Grounding-SAM](https://github.com/IDEA-Research/Grounded-Segment-Anything), [AnyLabeling](https://github.com/vietanhdev/anylabeling), and [SegmentAnythingin3D](https://github.com/Jumpat/SegmentAnythingin3D). |
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MobileSAM is trained on a single GPU with a 100k dataset (1% of the original images) in less than a day. The code for this training will be made available in the future. |
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## Adapting from SAM to MobileSAM |
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Since MobileSAM retains the same pipeline as the original SAM, we have incorporated the original's pre-processing, post-processing, and all other interfaces. Consequently, those currently using the original SAM can transition to MobileSAM with minimal effort. |
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MobileSAM performs comparably to the original SAM and retains the same pipeline except for a change in the image encoder. Specifically, we replace the original heavyweight ViT-H encoder (632M) with a smaller Tiny-ViT (5M). On a single GPU, MobileSAM operates at about 12ms per image: 8ms on the image encoder and 4ms on the mask decoder. |
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The following table provides a comparison of ViT-based image encoders: |
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| Image Encoder | Original SAM | MobileSAM | |
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|---------------|--------------|-----------| |
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| Parameters | 611M | 5M | |
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| Speed | 452ms | 8ms | |
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Both the original SAM and MobileSAM utilize the same prompt-guided mask decoder: |
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| Mask Decoder | Original SAM | MobileSAM | |
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|--------------|--------------|-----------| |
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| Parameters | 3.876M | 3.876M | |
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| Speed | 4ms | 4ms | |
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Here is the comparison of the whole pipeline: |
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| Whole Pipeline (Enc+Dec) | Original SAM | MobileSAM | |
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|--------------------------|--------------|-----------| |
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| Parameters | 615M | 9.66M | |
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| Speed | 456ms | 12ms | |
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The performance of MobileSAM and the original SAM are demonstrated using both a point and a box as prompts. |
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With its superior performance, MobileSAM is approximately 5 times smaller and 7 times faster than the current FastSAM. More details are available at the [MobileSAM project page](https://github.com/ChaoningZhang/MobileSAM). |
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## Testing MobileSAM in Ultralytics |
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Just like the original SAM, we offer a straightforward testing method in Ultralytics, including modes for both Point and Box prompts. |
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### Model Download |
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You can download the model [here](https://github.com/ChaoningZhang/MobileSAM/blob/master/weights/mobile_sam.pt). |
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### Point Prompt |
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```python |
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from ultralytics import SAM |
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# Load the model |
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model = SAM('mobile_sam.pt') |
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# Predict a segment based on a point prompt |
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model.predict('ultralytics/assets/zidane.jpg', points=[900, 370], labels=[1]) |
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``` |
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### Box Prompt |
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```python |
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from ultralytics import SAM |
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# Load the model |
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model = SAM('mobile_sam.pt') |
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# Predict a segment based on a box prompt |
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model.predict('ultralytics/assets/zidane.jpg', bboxes=[439, 437, 524, 709]) |
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``` |
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We have implemented `MobileSAM` and `SAM` using the same API. For more usage information, please see the [SAM page](./sam.md). |
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### Citing MobileSAM |
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If you find MobileSAM useful in your research or development work, please consider citing our paper: |
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```bibtex |
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@article{mobile_sam, |
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title={Faster Segment Anything: Towards Lightweight SAM for Mobile Applications}, |
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author={Zhang, Chaoning and Han, Dongshen and Qiao, Yu and Kim, Jung Uk and Bae, Sung Ho and Lee, Seungkyu and Hong, Choong Seon}, |
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journal={arXiv preprint arXiv:2306.14289}, |
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year={2023} |
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} |
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``` |
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--- |
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description: Learn how to use the ResizeLongestSide module in Ultralytics YOLO for automatic image resizing. Resize your images with ease. |
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keywords: ResizeLongestSide, Ultralytics YOLO, automatic image resizing, image resizing |
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--- |
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## ResizeLongestSide |
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--- |
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### ::: ultralytics.vit.sam.autosize.ResizeLongestSide |
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<br><br> |
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--- |
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description: Learn about the SamAutomaticMaskGenerator module in Ultralytics YOLO, an automatic mask generator for image segmentation. |
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keywords: SamAutomaticMaskGenerator, Ultralytics YOLO, automatic mask generator, image segmentation |
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--- |
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## SamAutomaticMaskGenerator |
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--- |
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### ::: ultralytics.vit.sam.modules.mask_generator.SamAutomaticMaskGenerator |
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<br><br> |
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--- |
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description: Learn about PromptPredictor - a module in Ultralytics VIT SAM that predicts image captions based on prompts. Get started today!. |
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keywords: PromptPredictor, Ultralytics, YOLO, VIT SAM, image captioning, deep learning, computer vision |
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--- |
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## PromptPredictor |
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--- |
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### ::: ultralytics.vit.sam.modules.prompt_predictor.PromptPredictor |
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<br><br> |
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--- |
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description: Learn about the Conv2d_BN, MBConv, ConvLayer, Attention, BasicLayer, and TinyViT modules. |
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keywords: Conv2d_BN, MBConv, ConvLayer, Attention, BasicLayer, TinyViT |
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--- |
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## Conv2d_BN |
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--- |
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### ::: ultralytics.vit.sam.modules.tiny_encoder.Conv2d_BN |
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<br><br> |
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## PatchEmbed |
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--- |
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### ::: ultralytics.vit.sam.modules.tiny_encoder.PatchEmbed |
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<br><br> |
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## MBConv |
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--- |
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### ::: ultralytics.vit.sam.modules.tiny_encoder.MBConv |
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<br><br> |
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## PatchMerging |
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--- |
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### ::: ultralytics.vit.sam.modules.tiny_encoder.PatchMerging |
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<br><br> |
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## ConvLayer |
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--- |
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### ::: ultralytics.vit.sam.modules.tiny_encoder.ConvLayer |
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<br><br> |
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## Mlp |
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--- |
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### ::: ultralytics.vit.sam.modules.tiny_encoder.Mlp |
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<br><br> |
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## Attention |
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--- |
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### ::: ultralytics.vit.sam.modules.tiny_encoder.Attention |
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<br><br> |
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## TinyViTBlock |
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--- |
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### ::: ultralytics.vit.sam.modules.tiny_encoder.TinyViTBlock |
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<br><br> |
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## BasicLayer |
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--- |
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### ::: ultralytics.vit.sam.modules.tiny_encoder.BasicLayer |
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<br><br> |
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## LayerNorm2d |
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--- |
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### ::: ultralytics.vit.sam.modules.tiny_encoder.LayerNorm2d |
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<br><br> |
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## TinyViT |
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--- |
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### ::: ultralytics.vit.sam.modules.tiny_encoder.TinyViT |
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<br><br> |
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--- |
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description: Learn how to use FastSAM in Ultralytics YOLO to improve object detection accuracy and speed. |
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keywords: FastSAM, object detection, accuracy, speed, Ultralytics YOLO |
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--- |
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## FastSAM |
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--- |
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### ::: ultralytics.yolo.fastsam.model.FastSAM |
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<br><br> |
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--- |
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description: FastSAMPredictor API reference and usage guide for the Ultralytics YOLO object detection library. |
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keywords: FastSAMPredictor, API, reference, usage, guide, Ultralytics, YOLO, object detection, library |
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--- |
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## FastSAMPredictor |
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--- |
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### ::: ultralytics.yolo.fastsam.predict.FastSAMPredictor |
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<br><br> |
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--- |
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description: Learn how to use FastSAMPrompt in Ultralytics YOLO for fast and efficient object detection and tracking. |
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keywords: FastSAMPrompt, Ultralytics YOLO, object detection, tracking, fast, efficient |
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--- |
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## FastSAMPrompt |
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--- |
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### ::: ultralytics.yolo.fastsam.prompt.FastSAMPrompt |
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<br><br> |
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--- |
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description: Learn how to adjust bounding boxes to the image border in Ultralytics YOLO framework. Improve object detection accuracy by accounting for image borders. |
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keywords: adjust_bboxes_to_image_border, Ultralytics YOLO, object detection, bounding boxes, image border |
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--- |
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## adjust_bboxes_to_image_border |
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--- |
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### ::: ultralytics.yolo.fastsam.utils.adjust_bboxes_to_image_border |
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<br><br> |
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## bbox_iou |
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--- |
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### ::: ultralytics.yolo.fastsam.utils.bbox_iou |
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<br><br> |
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--- |
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description: Learn about the FastSAMValidator module in Ultralytics YOLO. Validate and evaluate Segment Anything Model (SAM) datasets for object detection models with ease. |
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keywords: FastSAMValidator, Ultralytics YOLO, SAM datasets, object detection, validation, evaluation |
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--- |
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## FastSAMValidator |
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--- |
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### ::: ultralytics.yolo.fastsam.val.FastSAMValidator |
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<br><br> |
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# Ultralytics YOLO 🚀, AGPL-3.0 license |
# Ultralytics YOLO 🚀, AGPL-3.0 license |
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from .build import build_sam # noqa |
from .model import SAM |
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from .model import SAM # noqa |
from .predict import Predictor |
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from .modules.prompt_predictor import PromptPredictor # noqa |
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# from .build import build_sam |
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__all__ = 'SAM', 'Predictor' # tuple or list |
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# Ultralytics YOLO 🚀, AGPL-3.0 license |
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# Copyright (c) Meta Platforms, Inc. and affiliates. |
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# All rights reserved. |
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# This source code is licensed under the license found in the |
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# LICENSE file in the root directory of this source tree. |
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from copy import deepcopy |
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from typing import Tuple |
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import numpy as np |
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import torch |
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from torch.nn import functional as F |
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from torchvision.transforms.functional import resize, to_pil_image # type: ignore |
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class ResizeLongestSide: |
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""" |
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Resizes images to the longest side 'target_length', as well as provides |
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methods for resizing coordinates and boxes. Provides methods for |
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transforming both numpy array and batched torch tensors. |
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""" |
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def __init__(self, target_length: int) -> None: |
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self.target_length = target_length |
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def apply_image(self, image: np.ndarray) -> np.ndarray: |
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""" |
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Expects a numpy array with shape HxWxC in uint8 format. |
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""" |
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target_size = self.get_preprocess_shape(image.shape[0], image.shape[1], self.target_length) |
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return np.array(resize(to_pil_image(image), target_size)) |
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def apply_coords(self, coords: np.ndarray, original_size: Tuple[int, ...]) -> np.ndarray: |
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""" |
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Expects a numpy array of length 2 in the final dimension. Requires the |
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original image size in (H, W) format. |
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""" |
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old_h, old_w = original_size |
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new_h, new_w = self.get_preprocess_shape(original_size[0], original_size[1], self.target_length) |
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coords = deepcopy(coords).astype(float) |
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coords[..., 0] = coords[..., 0] * (new_w / old_w) |
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coords[..., 1] = coords[..., 1] * (new_h / old_h) |
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return coords |
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def apply_boxes(self, boxes: np.ndarray, original_size: Tuple[int, ...]) -> np.ndarray: |
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""" |
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Expects a numpy array shape Bx4. Requires the original image size |
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in (H, W) format. |
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""" |
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boxes = self.apply_coords(boxes.reshape(-1, 2, 2), original_size) |
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return boxes.reshape(-1, 4) |
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def apply_image_torch(self, image: torch.Tensor) -> torch.Tensor: |
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""" |
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Expects batched images with shape BxCxHxW and float format. This |
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transformation may not exactly match apply_image. apply_image is |
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the transformation expected by the model. |
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""" |
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# Expects an image in BCHW format. May not exactly match apply_image. |
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target_size = self.get_preprocess_shape(image.shape[2], image.shape[3], self.target_length) |
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return F.interpolate(image, target_size, mode='bilinear', align_corners=False, antialias=True) |
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def apply_coords_torch(self, coords: torch.Tensor, original_size: Tuple[int, ...]) -> torch.Tensor: |
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""" |
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Expects a torch tensor with length 2 in the last dimension. Requires the |
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original image size in (H, W) format. |
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""" |
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old_h, old_w = original_size |
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new_h, new_w = self.get_preprocess_shape(original_size[0], original_size[1], self.target_length) |
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coords = deepcopy(coords).to(torch.float) |
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coords[..., 0] = coords[..., 0] * (new_w / old_w) |
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coords[..., 1] = coords[..., 1] * (new_h / old_h) |
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return coords |
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def apply_boxes_torch(self, boxes: torch.Tensor, original_size: Tuple[int, ...]) -> torch.Tensor: |
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""" |
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Expects a torch tensor with shape Bx4. Requires the original image |
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size in (H, W) format. |
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""" |
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boxes = self.apply_coords_torch(boxes.reshape(-1, 2, 2), original_size) |
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return boxes.reshape(-1, 4) |
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@staticmethod |
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def get_preprocess_shape(oldh: int, oldw: int, long_side_length: int) -> Tuple[int, int]: |
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""" |
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Compute the output size given input size and target long side length. |
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""" |
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scale = long_side_length * 1.0 / max(oldh, oldw) |
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newh, neww = oldh * scale, oldw * scale |
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neww = int(neww + 0.5) |
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newh = int(newh + 0.5) |
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return (newh, neww) |
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@ -1,353 +0,0 @@ |
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# Ultralytics YOLO 🚀, AGPL-3.0 license |
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# Copyright (c) Meta Platforms, Inc. and affiliates. |
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# All rights reserved. |
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# This source code is licensed under the license found in the |
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# LICENSE file in the root directory of this source tree. |
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from typing import Any, Dict, List, Optional, Tuple |
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import numpy as np |
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import torch |
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from torchvision.ops.boxes import batched_nms, box_area # type: ignore |
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from ..amg import (MaskData, area_from_rle, batch_iterator, batched_mask_to_box, box_xyxy_to_xywh, |
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build_all_layer_point_grids, calculate_stability_score, coco_encode_rle, generate_crop_boxes, |
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is_box_near_crop_edge, mask_to_rle_pytorch, remove_small_regions, rle_to_mask, uncrop_boxes_xyxy, |
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uncrop_masks, uncrop_points) |
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from .prompt_predictor import PromptPredictor |
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from .sam import Sam |
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class SamAutomaticMaskGenerator: |
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def __init__( |
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self, |
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model: Sam, |
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points_per_side: Optional[int] = 32, |
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points_per_batch: int = 64, |
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pred_iou_thresh: float = 0.88, |
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stability_score_thresh: float = 0.95, |
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stability_score_offset: float = 1.0, |
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box_nms_thresh: float = 0.7, |
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crop_n_layers: int = 0, |
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||||||
crop_nms_thresh: float = 0.7, |
|
||||||
crop_overlap_ratio: float = 512 / 1500, |
|
||||||
crop_n_points_downscale_factor: int = 1, |
|
||||||
point_grids: Optional[List[np.ndarray]] = None, |
|
||||||
min_mask_region_area: int = 0, |
|
||||||
output_mode: str = 'binary_mask', |
|
||||||
) -> None: |
|
||||||
""" |
|
||||||
Using a SAM model, generates masks for the entire image. |
|
||||||
Generates a grid of point prompts over the image, then filters |
|
||||||
low quality and duplicate masks. The default settings are chosen |
|
||||||
for SAM with a ViT-H backbone. |
|
||||||
|
|
||||||
Arguments: |
|
||||||
model (Sam): The SAM model to use for mask prediction. |
|
||||||
points_per_side (int, None): The number of points to be sampled |
|
||||||
along one side of the image. The total number of points is |
|
||||||
points_per_side**2. If None, 'point_grids' must provide explicit |
|
||||||
point sampling. |
|
||||||
points_per_batch (int): Sets the number of points run simultaneously |
|
||||||
by the model. Higher numbers may be faster but use more GPU memory. |
|
||||||
pred_iou_thresh (float): A filtering threshold in [0,1], using the |
|
||||||
model's predicted mask quality. |
|
||||||
stability_score_thresh (float): A filtering threshold in [0,1], using |
|
||||||
the stability of the mask under changes to the cutoff used to binarize |
|
||||||
the model's mask predictions. |
|
||||||
stability_score_offset (float): The amount to shift the cutoff when |
|
||||||
calculated the stability score. |
|
||||||
box_nms_thresh (float): The box IoU cutoff used by non-maximal |
|
||||||
suppression to filter duplicate masks. |
|
||||||
crop_n_layers (int): If >0, mask prediction will be run again on |
|
||||||
crops of the image. Sets the number of layers to run, where each |
|
||||||
layer has 2**i_layer number of image crops. |
|
||||||
crop_nms_thresh (float): The box IoU cutoff used by non-maximal |
|
||||||
suppression to filter duplicate masks between different crops. |
|
||||||
crop_overlap_ratio (float): Sets the degree to which crops overlap. |
|
||||||
In the first crop layer, crops will overlap by this fraction of |
|
||||||
the image length. Later layers with more crops scale down this overlap. |
|
||||||
crop_n_points_downscale_factor (int): The number of points-per-side |
|
||||||
sampled in layer n is scaled down by crop_n_points_downscale_factor**n. |
|
||||||
point_grids (list(np.ndarray), None): A list over explicit grids |
|
||||||
of points used for sampling, normalized to [0,1]. The nth grid in the |
|
||||||
list is used in the nth crop layer. Exclusive with points_per_side. |
|
||||||
min_mask_region_area (int): If >0, postprocessing will be applied |
|
||||||
to remove disconnected regions and holes in masks with area smaller |
|
||||||
than min_mask_region_area. Requires opencv. |
|
||||||
output_mode (str): The form masks are returned in. Can be 'binary_mask', |
|
||||||
'uncompressed_rle', or 'coco_rle'. 'coco_rle' requires pycocotools. |
|
||||||
For large resolutions, 'binary_mask' may consume large amounts of |
|
||||||
memory. |
|
||||||
""" |
|
||||||
|
|
||||||
assert (points_per_side is None) != (point_grids is None), \ |
|
||||||
'Exactly one of points_per_side or point_grid must be provided.' |
|
||||||
if points_per_side is not None: |
|
||||||
self.point_grids = build_all_layer_point_grids( |
|
||||||
points_per_side, |
|
||||||
crop_n_layers, |
|
||||||
crop_n_points_downscale_factor, |
|
||||||
) |
|
||||||
elif point_grids is not None: |
|
||||||
self.point_grids = point_grids |
|
||||||
else: |
|
||||||
raise ValueError("Can't have both points_per_side and point_grid be None.") |
|
||||||
|
|
||||||
assert output_mode in {'binary_mask', 'uncompressed_rle', 'coco_rle'}, f'Unknown output_mode {output_mode}.' |
|
||||||
if output_mode == 'coco_rle': |
|
||||||
from pycocotools import mask as mask_utils # type: ignore # noqa: F401 |
|
||||||
|
|
||||||
if min_mask_region_area > 0: |
|
||||||
import cv2 # type: ignore # noqa: F401 |
|
||||||
|
|
||||||
self.predictor = PromptPredictor(model) |
|
||||||
self.points_per_batch = points_per_batch |
|
||||||
self.pred_iou_thresh = pred_iou_thresh |
|
||||||
self.stability_score_thresh = stability_score_thresh |
|
||||||
self.stability_score_offset = stability_score_offset |
|
||||||
self.box_nms_thresh = box_nms_thresh |
|
||||||
self.crop_n_layers = crop_n_layers |
|
||||||
self.crop_nms_thresh = crop_nms_thresh |
|
||||||
self.crop_overlap_ratio = crop_overlap_ratio |
|
||||||
self.crop_n_points_downscale_factor = crop_n_points_downscale_factor |
|
||||||
self.min_mask_region_area = min_mask_region_area |
|
||||||
self.output_mode = output_mode |
|
||||||
|
|
||||||
# TODO: Temporary implementation for compatibility |
|
||||||
def __call__(self, image: np.ndarray, augment=False, visualize=False) -> List[Dict[str, Any]]: |
|
||||||
return self.generate(image) |
|
||||||
|
|
||||||
@torch.no_grad() |
|
||||||
def generate(self, image: np.ndarray) -> List[Dict[str, Any]]: |
|
||||||
""" |
|
||||||
Generates masks for the given image. |
|
||||||
|
|
||||||
Arguments: |
|
||||||
image (np.ndarray): The image to generate masks for, in HWC uint8 format. |
|
||||||
|
|
||||||
Returns: |
|
||||||
list(dict(str, any)): A list over records for masks. Each record is a dict containing the following keys: |
|
||||||
segmentation (dict(str, any), np.ndarray): The mask. If |
|
||||||
output_mode='binary_mask', is an array of shape HW. Otherwise, |
|
||||||
is a dictionary containing the RLE. |
|
||||||
bbox (list(float)): The box around the mask, in XYWH format. |
|
||||||
area (int): The area in pixels of the mask. |
|
||||||
predicted_iou (float): The model's own prediction of the mask's |
|
||||||
quality. This is filtered by the pred_iou_thresh parameter. |
|
||||||
point_coords (list(list(float))): The point coordinates input |
|
||||||
to the model to generate this mask. |
|
||||||
stability_score (float): A measure of the mask's quality. This |
|
||||||
is filtered on using the stability_score_thresh parameter. |
|
||||||
crop_box (list(float)): The crop of the image used to generate |
|
||||||
the mask, given in XYWH format. |
|
||||||
""" |
|
||||||
|
|
||||||
# Generate masks |
|
||||||
mask_data = self._generate_masks(image) |
|
||||||
|
|
||||||
# Filter small disconnected regions and holes in masks |
|
||||||
if self.min_mask_region_area > 0: |
|
||||||
mask_data = self.postprocess_small_regions( |
|
||||||
mask_data, |
|
||||||
self.min_mask_region_area, |
|
||||||
max(self.box_nms_thresh, self.crop_nms_thresh), |
|
||||||
) |
|
||||||
|
|
||||||
# Encode masks |
|
||||||
if self.output_mode == 'coco_rle': |
|
||||||
mask_data['segmentations'] = [coco_encode_rle(rle) for rle in mask_data['rles']] |
|
||||||
elif self.output_mode == 'binary_mask': |
|
||||||
mask_data['segmentations'] = [rle_to_mask(rle) for rle in mask_data['rles']] |
|
||||||
else: |
|
||||||
mask_data['segmentations'] = mask_data['rles'] |
|
||||||
|
|
||||||
# Write mask records |
|
||||||
curr_anns = [] |
|
||||||
for idx in range(len(mask_data['segmentations'])): |
|
||||||
ann = { |
|
||||||
'segmentation': mask_data['segmentations'][idx], |
|
||||||
'area': area_from_rle(mask_data['rles'][idx]), |
|
||||||
'bbox': box_xyxy_to_xywh(mask_data['boxes'][idx]).tolist(), |
|
||||||
'predicted_iou': mask_data['iou_preds'][idx].item(), |
|
||||||
'point_coords': [mask_data['points'][idx].tolist()], |
|
||||||
'stability_score': mask_data['stability_score'][idx].item(), |
|
||||||
'crop_box': box_xyxy_to_xywh(mask_data['crop_boxes'][idx]).tolist(), } |
|
||||||
curr_anns.append(ann) |
|
||||||
|
|
||||||
return curr_anns |
|
||||||
|
|
||||||
def _generate_masks(self, image: np.ndarray) -> MaskData: |
|
||||||
orig_size = image.shape[:2] |
|
||||||
crop_boxes, layer_idxs = generate_crop_boxes(orig_size, self.crop_n_layers, self.crop_overlap_ratio) |
|
||||||
|
|
||||||
# Iterate over image crops |
|
||||||
data = MaskData() |
|
||||||
for crop_box, layer_idx in zip(crop_boxes, layer_idxs): |
|
||||||
crop_data = self._process_crop(image, crop_box, layer_idx, orig_size) |
|
||||||
data.cat(crop_data) |
|
||||||
|
|
||||||
# Remove duplicate masks between crops |
|
||||||
if len(crop_boxes) > 1: |
|
||||||
# Prefer masks from smaller crops |
|
||||||
scores = 1 / box_area(data['crop_boxes']) |
|
||||||
scores = scores.to(data['boxes'].device) |
|
||||||
keep_by_nms = batched_nms( |
|
||||||
data['boxes'].float(), |
|
||||||
scores, |
|
||||||
torch.zeros_like(data['boxes'][:, 0]), # categories |
|
||||||
iou_threshold=self.crop_nms_thresh, |
|
||||||
) |
|
||||||
data.filter(keep_by_nms) |
|
||||||
|
|
||||||
data.to_numpy() |
|
||||||
return data |
|
||||||
|
|
||||||
def _process_crop( |
|
||||||
self, |
|
||||||
image: np.ndarray, |
|
||||||
crop_box: List[int], |
|
||||||
crop_layer_idx: int, |
|
||||||
orig_size: Tuple[int, ...], |
|
||||||
) -> MaskData: |
|
||||||
# Crop the image and calculate embeddings |
|
||||||
x0, y0, x1, y1 = crop_box |
|
||||||
cropped_im = image[y0:y1, x0:x1, :] |
|
||||||
cropped_im_size = cropped_im.shape[:2] |
|
||||||
self.predictor.set_image(cropped_im) |
|
||||||
|
|
||||||
# Get points for this crop |
|
||||||
points_scale = np.array(cropped_im_size)[None, ::-1] |
|
||||||
points_for_image = self.point_grids[crop_layer_idx] * points_scale |
|
||||||
|
|
||||||
# Generate masks for this crop in batches |
|
||||||
data = MaskData() |
|
||||||
for (points, ) in batch_iterator(self.points_per_batch, points_for_image): |
|
||||||
batch_data = self._process_batch(points, cropped_im_size, crop_box, orig_size) |
|
||||||
data.cat(batch_data) |
|
||||||
del batch_data |
|
||||||
self.predictor.reset_image() |
|
||||||
|
|
||||||
# Remove duplicates within this crop. |
|
||||||
keep_by_nms = batched_nms( |
|
||||||
data['boxes'].float(), |
|
||||||
data['iou_preds'], |
|
||||||
torch.zeros_like(data['boxes'][:, 0]), # categories |
|
||||||
iou_threshold=self.box_nms_thresh, |
|
||||||
) |
|
||||||
data.filter(keep_by_nms) |
|
||||||
|
|
||||||
# Return to the original image frame |
|
||||||
data['boxes'] = uncrop_boxes_xyxy(data['boxes'], crop_box) |
|
||||||
data['points'] = uncrop_points(data['points'], crop_box) |
|
||||||
data['crop_boxes'] = torch.tensor([crop_box for _ in range(len(data['rles']))]) |
|
||||||
|
|
||||||
return data |
|
||||||
|
|
||||||
def _process_batch( |
|
||||||
self, |
|
||||||
points: np.ndarray, |
|
||||||
im_size: Tuple[int, ...], |
|
||||||
crop_box: List[int], |
|
||||||
orig_size: Tuple[int, ...], |
|
||||||
) -> MaskData: |
|
||||||
orig_h, orig_w = orig_size |
|
||||||
|
|
||||||
# Run model on this batch |
|
||||||
transformed_points = self.predictor.transform.apply_coords(points, im_size) |
|
||||||
in_points = torch.as_tensor(transformed_points, device=self.predictor.device) |
|
||||||
in_labels = torch.ones(in_points.shape[0], dtype=torch.int, device=in_points.device) |
|
||||||
masks, iou_preds, _ = self.predictor.predict_torch( |
|
||||||
in_points[:, None, :], |
|
||||||
in_labels[:, None], |
|
||||||
multimask_output=True, |
|
||||||
return_logits=True, |
|
||||||
) |
|
||||||
|
|
||||||
# Serialize predictions and store in MaskData |
|
||||||
data = MaskData( |
|
||||||
masks=masks.flatten(0, 1), |
|
||||||
iou_preds=iou_preds.flatten(0, 1), |
|
||||||
points=torch.as_tensor(points.repeat(masks.shape[1], axis=0)), |
|
||||||
) |
|
||||||
del masks |
|
||||||
|
|
||||||
# Filter by predicted IoU |
|
||||||
if self.pred_iou_thresh > 0.0: |
|
||||||
keep_mask = data['iou_preds'] > self.pred_iou_thresh |
|
||||||
data.filter(keep_mask) |
|
||||||
|
|
||||||
# Calculate stability score |
|
||||||
data['stability_score'] = calculate_stability_score(data['masks'], self.predictor.model.mask_threshold, |
|
||||||
self.stability_score_offset) |
|
||||||
if self.stability_score_thresh > 0.0: |
|
||||||
keep_mask = data['stability_score'] >= self.stability_score_thresh |
|
||||||
data.filter(keep_mask) |
|
||||||
|
|
||||||
# Threshold masks and calculate boxes |
|
||||||
data['masks'] = data['masks'] > self.predictor.model.mask_threshold |
|
||||||
data['boxes'] = batched_mask_to_box(data['masks']) |
|
||||||
|
|
||||||
# Filter boxes that touch crop boundaries |
|
||||||
keep_mask = ~is_box_near_crop_edge(data['boxes'], crop_box, [0, 0, orig_w, orig_h]) |
|
||||||
if not torch.all(keep_mask): |
|
||||||
data.filter(keep_mask) |
|
||||||
|
|
||||||
# Compress to RLE |
|
||||||
data['masks'] = uncrop_masks(data['masks'], crop_box, orig_h, orig_w) |
|
||||||
data['rles'] = mask_to_rle_pytorch(data['masks']) |
|
||||||
del data['masks'] |
|
||||||
|
|
||||||
return data |
|
||||||
|
|
||||||
@staticmethod |
|
||||||
def postprocess_small_regions(mask_data: MaskData, min_area: int, nms_thresh: float) -> MaskData: |
|
||||||
""" |
|
||||||
Removes small disconnected regions and holes in masks, then reruns |
|
||||||
box NMS to remove any new duplicates. |
|
||||||
|
|
||||||
Edits mask_data in place. |
|
||||||
|
|
||||||
Requires open-cv as a dependency. |
|
||||||
""" |
|
||||||
if len(mask_data['rles']) == 0: |
|
||||||
return mask_data |
|
||||||
|
|
||||||
# Filter small disconnected regions and holes |
|
||||||
new_masks = [] |
|
||||||
scores = [] |
|
||||||
for rle in mask_data['rles']: |
|
||||||
mask = rle_to_mask(rle) |
|
||||||
|
|
||||||
mask, changed = remove_small_regions(mask, min_area, mode='holes') |
|
||||||
unchanged = not changed |
|
||||||
mask, changed = remove_small_regions(mask, min_area, mode='islands') |
|
||||||
unchanged = unchanged and not changed |
|
||||||
|
|
||||||
new_masks.append(torch.as_tensor(mask).unsqueeze(0)) |
|
||||||
# Give score=0 to changed masks and score=1 to unchanged masks |
|
||||||
# so NMS will prefer ones that didn't need postprocessing |
|
||||||
scores.append(float(unchanged)) |
|
||||||
|
|
||||||
# Recalculate boxes and remove any new duplicates |
|
||||||
masks = torch.cat(new_masks, dim=0) |
|
||||||
boxes = batched_mask_to_box(masks) |
|
||||||
keep_by_nms = batched_nms( |
|
||||||
boxes.float(), |
|
||||||
torch.as_tensor(scores), |
|
||||||
torch.zeros_like(boxes[:, 0]), # categories |
|
||||||
iou_threshold=nms_thresh, |
|
||||||
) |
|
||||||
|
|
||||||
# Only recalculate RLEs for masks that have changed |
|
||||||
for i_mask in keep_by_nms: |
|
||||||
if scores[i_mask] == 0.0: |
|
||||||
mask_torch = masks[i_mask].unsqueeze(0) |
|
||||||
mask_data['rles'][i_mask] = mask_to_rle_pytorch(mask_torch)[0] |
|
||||||
mask_data['boxes'][i_mask] = boxes[i_mask] # update res directly |
|
||||||
mask_data.filter(keep_by_nms) |
|
||||||
|
|
||||||
return mask_data |
|
||||||
@ -1,242 +0,0 @@ |
|||||||
# Ultralytics YOLO 🚀, AGPL-3.0 license |
|
||||||
|
|
||||||
from typing import Optional, Tuple |
|
||||||
|
|
||||||
import numpy as np |
|
||||||
import torch |
|
||||||
|
|
||||||
from ..autosize import ResizeLongestSide |
|
||||||
from .sam import Sam |
|
||||||
|
|
||||||
|
|
||||||
class PromptPredictor: |
|
||||||
|
|
||||||
def __init__(self, sam_model: Sam) -> None: |
|
||||||
""" |
|
||||||
Uses SAM to calculate the image embedding for an image, and then |
|
||||||
allow repeated, efficient mask prediction given prompts. |
|
||||||
|
|
||||||
Arguments: |
|
||||||
sam_model (Sam): The model to use for mask prediction. |
|
||||||
""" |
|
||||||
super().__init__() |
|
||||||
self.model = sam_model |
|
||||||
self.transform = ResizeLongestSide(sam_model.image_encoder.img_size) |
|
||||||
self.reset_image() |
|
||||||
|
|
||||||
def set_image(self, image: np.ndarray, image_format: str = 'RGB') -> None: |
|
||||||
""" |
|
||||||
Calculates the image embeddings for the provided image, allowing |
|
||||||
masks to be predicted with the 'predict' method. |
|
||||||
|
|
||||||
Arguments: |
|
||||||
image (np.ndarray): The image for calculating masks. Expects an |
|
||||||
image in HWC uint8 format, with pixel values in [0, 255]. |
|
||||||
image_format (str): The color format of the image, in ['RGB', 'BGR']. |
|
||||||
""" |
|
||||||
assert image_format in {'RGB', 'BGR'}, f"image_format must be in ['RGB', 'BGR'], is {image_format}." |
|
||||||
if image_format != self.model.image_format: |
|
||||||
image = image[..., ::-1] |
|
||||||
|
|
||||||
# Transform the image to the form expected by the model |
|
||||||
input_image = self.transform.apply_image(image) |
|
||||||
input_image_torch = torch.as_tensor(input_image, device=self.device) |
|
||||||
input_image_torch = input_image_torch.permute(2, 0, 1).contiguous()[None, :, :, :] |
|
||||||
|
|
||||||
self.set_torch_image(input_image_torch, image.shape[:2]) |
|
||||||
|
|
||||||
@torch.no_grad() |
|
||||||
def set_torch_image(self, transformed_image: torch.Tensor, original_image_size: Tuple[int, ...]) -> None: |
|
||||||
""" |
|
||||||
Calculates the image embeddings for the provided image, allowing |
|
||||||
masks to be predicted with the 'predict' method. Expects the input |
|
||||||
image to be already transformed to the format expected by the model. |
|
||||||
|
|
||||||
Arguments: |
|
||||||
transformed_image (torch.Tensor): The input image, with shape |
|
||||||
1x3xHxW, which has been transformed with ResizeLongestSide. |
|
||||||
original_image_size (tuple(int, int)): The size of the image |
|
||||||
before transformation, in (H, W) format. |
|
||||||
""" |
|
||||||
if len(transformed_image.shape) != 4 \ |
|
||||||
or transformed_image.shape[1] != 3 \ |
|
||||||
or max(*transformed_image.shape[2:]) != self.model.image_encoder.img_size: |
|
||||||
raise ValueError('set_torch_image input must be BCHW with long side {self.model.image_encoder.img_size}.') |
|
||||||
self.reset_image() |
|
||||||
|
|
||||||
self.original_size = original_image_size |
|
||||||
self.input_size = tuple(transformed_image.shape[-2:]) |
|
||||||
input_image = self.model.preprocess(transformed_image) |
|
||||||
self.features = self.model.image_encoder(input_image) |
|
||||||
self.is_image_set = True |
|
||||||
|
|
||||||
def predict( |
|
||||||
self, |
|
||||||
point_coords: Optional[np.ndarray] = None, |
|
||||||
point_labels: Optional[np.ndarray] = None, |
|
||||||
box: Optional[np.ndarray] = None, |
|
||||||
mask_input: Optional[np.ndarray] = None, |
|
||||||
multimask_output: bool = True, |
|
||||||
return_logits: bool = False, |
|
||||||
) -> Tuple[np.ndarray, np.ndarray, np.ndarray]: |
|
||||||
""" |
|
||||||
Predict masks for the given input prompts, using the currently set image. |
|
||||||
|
|
||||||
Arguments: |
|
||||||
point_coords (np.ndarray, None): A Nx2 array of point prompts to the |
|
||||||
model. Each point is in (X,Y) in pixels. |
|
||||||
point_labels (np.ndarray, None): A length N array of labels for the |
|
||||||
point prompts. 1 indicates a foreground point and 0 indicates a |
|
||||||
background point. |
|
||||||
box (np.ndarray, None): A length 4 array given a box prompt to the |
|
||||||
model, in XYXY format. |
|
||||||
mask_input (np.ndarray): A low resolution mask input to the model, typically |
|
||||||
coming from a previous prediction iteration. Has form 1xHxW, where |
|
||||||
for SAM, H=W=256. |
|
||||||
multimask_output (bool): If true, the model will return three masks. |
|
||||||
For ambiguous input prompts (such as a single click), this will often |
|
||||||
produce better masks than a single prediction. If only a single |
|
||||||
mask is needed, the model's predicted quality score can be used |
|
||||||
to select the best mask. For non-ambiguous prompts, such as multiple |
|
||||||
input prompts, multimask_output=False can give better results. |
|
||||||
return_logits (bool): If true, returns un-thresholded masks logits |
|
||||||
instead of a binary mask. |
|
||||||
|
|
||||||
Returns: |
|
||||||
(np.ndarray): The output masks in CxHxW format, where C is the |
|
||||||
number of masks, and (H, W) is the original image size. |
|
||||||
(np.ndarray): An array of length C containing the model's |
|
||||||
predictions for the quality of each mask. |
|
||||||
(np.ndarray): An array of shape CxHxW, where C is the number |
|
||||||
of masks and H=W=256. These low resolution logits can be passed to |
|
||||||
a subsequent iteration as mask input. |
|
||||||
""" |
|
||||||
if not self.is_image_set: |
|
||||||
raise RuntimeError('An image must be set with .set_image(...) before mask prediction.') |
|
||||||
|
|
||||||
# Transform input prompts |
|
||||||
coords_torch, labels_torch, box_torch, mask_input_torch = None, None, None, None |
|
||||||
if point_coords is not None: |
|
||||||
assert (point_labels is not None), 'point_labels must be supplied if point_coords is supplied.' |
|
||||||
point_coords = self.transform.apply_coords(point_coords, self.original_size) |
|
||||||
coords_torch = torch.as_tensor(point_coords, dtype=torch.float, device=self.device) |
|
||||||
labels_torch = torch.as_tensor(point_labels, dtype=torch.int, device=self.device) |
|
||||||
coords_torch, labels_torch = coords_torch[None, :, :], labels_torch[None, :] |
|
||||||
if box is not None: |
|
||||||
box = self.transform.apply_boxes(box, self.original_size) |
|
||||||
box_torch = torch.as_tensor(box, dtype=torch.float, device=self.device) |
|
||||||
box_torch = box_torch[None, :] |
|
||||||
if mask_input is not None: |
|
||||||
mask_input_torch = torch.as_tensor(mask_input, dtype=torch.float, device=self.device) |
|
||||||
mask_input_torch = mask_input_torch[None, :, :, :] |
|
||||||
|
|
||||||
masks, iou_predictions, low_res_masks = self.predict_torch( |
|
||||||
coords_torch, |
|
||||||
labels_torch, |
|
||||||
box_torch, |
|
||||||
mask_input_torch, |
|
||||||
multimask_output, |
|
||||||
return_logits=return_logits, |
|
||||||
) |
|
||||||
|
|
||||||
masks_np = masks[0].detach().cpu().numpy() |
|
||||||
iou_predictions_np = iou_predictions[0].detach().cpu().numpy() |
|
||||||
low_res_masks_np = low_res_masks[0].detach().cpu().numpy() |
|
||||||
return masks_np, iou_predictions_np, low_res_masks_np |
|
||||||
|
|
||||||
@torch.no_grad() |
|
||||||
def predict_torch( |
|
||||||
self, |
|
||||||
point_coords: Optional[torch.Tensor], |
|
||||||
point_labels: Optional[torch.Tensor], |
|
||||||
boxes: Optional[torch.Tensor] = None, |
|
||||||
mask_input: Optional[torch.Tensor] = None, |
|
||||||
multimask_output: bool = True, |
|
||||||
return_logits: bool = False, |
|
||||||
) -> Tuple[torch.Tensor, torch.Tensor, torch.Tensor]: |
|
||||||
""" |
|
||||||
Predict masks for the given input prompts, using the currently set image. |
|
||||||
Input prompts are batched torch tensors and are expected to already be |
|
||||||
transformed to the input frame using ResizeLongestSide. |
|
||||||
|
|
||||||
Arguments: |
|
||||||
point_coords (torch.Tensor, None): A BxNx2 array of point prompts to the |
|
||||||
model. Each point is in (X,Y) in pixels. |
|
||||||
point_labels (torch.Tensor, None): A BxN array of labels for the |
|
||||||
point prompts. 1 indicates a foreground point and 0 indicates a |
|
||||||
background point. |
|
||||||
boxes (np.ndarray, None): A Bx4 array given a box prompt to the |
|
||||||
model, in XYXY format. |
|
||||||
mask_input (np.ndarray): A low resolution mask input to the model, typically |
|
||||||
coming from a previous prediction iteration. Has form Bx1xHxW, where |
|
||||||
for SAM, H=W=256. Masks returned by a previous iteration of the |
|
||||||
predict method do not need further transformation. |
|
||||||
multimask_output (bool): If true, the model will return three masks. |
|
||||||
For ambiguous input prompts (such as a single click), this will often |
|
||||||
produce better masks than a single prediction. If only a single |
|
||||||
mask is needed, the model's predicted quality score can be used |
|
||||||
to select the best mask. For non-ambiguous prompts, such as multiple |
|
||||||
input prompts, multimask_output=False can give better results. |
|
||||||
return_logits (bool): If true, returns un-thresholded masks logits |
|
||||||
instead of a binary mask. |
|
||||||
|
|
||||||
Returns: |
|
||||||
(torch.Tensor): The output masks in BxCxHxW format, where C is the |
|
||||||
number of masks, and (H, W) is the original image size. |
|
||||||
(torch.Tensor): An array of shape BxC containing the model's |
|
||||||
predictions for the quality of each mask. |
|
||||||
(torch.Tensor): An array of shape BxCxHxW, where C is the number |
|
||||||
of masks and H=W=256. These low res logits can be passed to |
|
||||||
a subsequent iteration as mask input. |
|
||||||
""" |
|
||||||
if not self.is_image_set: |
|
||||||
raise RuntimeError('An image must be set with .set_image(...) before mask prediction.') |
|
||||||
|
|
||||||
points = (point_coords, point_labels) if point_coords is not None else None |
|
||||||
# Embed prompts |
|
||||||
sparse_embeddings, dense_embeddings = self.model.prompt_encoder( |
|
||||||
points=points, |
|
||||||
boxes=boxes, |
|
||||||
masks=mask_input, |
|
||||||
) |
|
||||||
|
|
||||||
# Predict masks |
|
||||||
low_res_masks, iou_predictions = self.model.mask_decoder( |
|
||||||
image_embeddings=self.features, |
|
||||||
image_pe=self.model.prompt_encoder.get_dense_pe(), |
|
||||||
sparse_prompt_embeddings=sparse_embeddings, |
|
||||||
dense_prompt_embeddings=dense_embeddings, |
|
||||||
multimask_output=multimask_output, |
|
||||||
) |
|
||||||
|
|
||||||
# Upscale the masks to the original image resolution |
|
||||||
masks = self.model.postprocess_masks(low_res_masks, self.input_size, self.original_size) |
|
||||||
|
|
||||||
if not return_logits: |
|
||||||
masks = masks > self.model.mask_threshold |
|
||||||
|
|
||||||
return masks, iou_predictions, low_res_masks |
|
||||||
|
|
||||||
def get_image_embedding(self) -> torch.Tensor: |
|
||||||
""" |
|
||||||
Returns the image embeddings for the currently set image, with |
|
||||||
shape 1xCxHxW, where C is the embedding dimension and (H,W) are |
|
||||||
the embedding spatial dimension of SAM (typically C=256, H=W=64). |
|
||||||
""" |
|
||||||
if not self.is_image_set: |
|
||||||
raise RuntimeError('An image must be set with .set_image(...) to generate an embedding.') |
|
||||||
assert self.features is not None, 'Features must exist if an image has been set.' |
|
||||||
return self.features |
|
||||||
|
|
||||||
@property |
|
||||||
def device(self) -> torch.device: |
|
||||||
return self.model.device |
|
||||||
|
|
||||||
def reset_image(self) -> None: |
|
||||||
"""Resets the currently set image.""" |
|
||||||
self.is_image_set = False |
|
||||||
self.features = None |
|
||||||
self.orig_h = None |
|
||||||
self.orig_w = None |
|
||||||
self.input_h = None |
|
||||||
self.input_w = None |
|
||||||
@ -0,0 +1,653 @@ |
|||||||
|
# Ultralytics YOLO 🚀, AGPL-3.0 license |
||||||
|
|
||||||
|
# -------------------------------------------------------- |
||||||
|
# TinyViT Model Architecture |
||||||
|
# Copyright (c) 2022 Microsoft |
||||||
|
# Adapted from LeViT and Swin Transformer |
||||||
|
# LeViT: (https://github.com/facebookresearch/levit) |
||||||
|
# Swin: (https://github.com/microsoft/swin-transformer) |
||||||
|
# Build the TinyViT Model |
||||||
|
# -------------------------------------------------------- |
||||||
|
|
||||||
|
import itertools |
||||||
|
from typing import Tuple |
||||||
|
|
||||||
|
import torch |
||||||
|
import torch.nn as nn |
||||||
|
import torch.nn.functional as F |
||||||
|
import torch.utils.checkpoint as checkpoint |
||||||
|
|
||||||
|
from ultralytics.yolo.utils.instance import to_2tuple |
||||||
|
|
||||||
|
|
||||||
|
class Conv2d_BN(torch.nn.Sequential): |
||||||
|
|
||||||
|
def __init__(self, a, b, ks=1, stride=1, pad=0, dilation=1, groups=1, bn_weight_init=1): |
||||||
|
super().__init__() |
||||||
|
self.add_module('c', torch.nn.Conv2d(a, b, ks, stride, pad, dilation, groups, bias=False)) |
||||||
|
bn = torch.nn.BatchNorm2d(b) |
||||||
|
torch.nn.init.constant_(bn.weight, bn_weight_init) |
||||||
|
torch.nn.init.constant_(bn.bias, 0) |
||||||
|
self.add_module('bn', bn) |
||||||
|
|
||||||
|
@torch.no_grad() |
||||||
|
def fuse(self): |
||||||
|
c, bn = self._modules.values() |
||||||
|
w = bn.weight / (bn.running_var + bn.eps) ** 0.5 |
||||||
|
w = c.weight * w[:, None, None, None] |
||||||
|
b = bn.bias - bn.running_mean * bn.weight / \ |
||||||
|
(bn.running_var + bn.eps)**0.5 |
||||||
|
m = torch.nn.Conv2d(w.size(1) * self.c.groups, |
||||||
|
w.size(0), |
||||||
|
w.shape[2:], |
||||||
|
stride=self.c.stride, |
||||||
|
padding=self.c.padding, |
||||||
|
dilation=self.c.dilation, |
||||||
|
groups=self.c.groups) |
||||||
|
m.weight.data.copy_(w) |
||||||
|
m.bias.data.copy_(b) |
||||||
|
return m |
||||||
|
|
||||||
|
|
||||||
|
# NOTE: This module and timm package is needed only for training. |
||||||
|
# from ultralytics.yolo.utils.checks import check_requirements |
||||||
|
# check_requirements('timm') |
||||||
|
# from timm.models.layers import DropPath as TimmDropPath |
||||||
|
# from timm.models.layers import trunc_normal_ |
||||||
|
# class DropPath(TimmDropPath): |
||||||
|
# |
||||||
|
# def __init__(self, drop_prob=None): |
||||||
|
# super().__init__(drop_prob=drop_prob) |
||||||
|
# self.drop_prob = drop_prob |
||||||
|
# |
||||||
|
# def __repr__(self): |
||||||
|
# msg = super().__repr__() |
||||||
|
# msg += f'(drop_prob={self.drop_prob})' |
||||||
|
# return msg |
||||||
|
|
||||||
|
|
||||||
|
class PatchEmbed(nn.Module): |
||||||
|
|
||||||
|
def __init__(self, in_chans, embed_dim, resolution, activation): |
||||||
|
super().__init__() |
||||||
|
img_size: Tuple[int, int] = to_2tuple(resolution) |
||||||
|
self.patches_resolution = (img_size[0] // 4, img_size[1] // 4) |
||||||
|
self.num_patches = self.patches_resolution[0] * \ |
||||||
|
self.patches_resolution[1] |
||||||
|
self.in_chans = in_chans |
||||||
|
self.embed_dim = embed_dim |
||||||
|
n = embed_dim |
||||||
|
self.seq = nn.Sequential( |
||||||
|
Conv2d_BN(in_chans, n // 2, 3, 2, 1), |
||||||
|
activation(), |
||||||
|
Conv2d_BN(n // 2, n, 3, 2, 1), |
||||||
|
) |
||||||
|
|
||||||
|
def forward(self, x): |
||||||
|
return self.seq(x) |
||||||
|
|
||||||
|
|
||||||
|
class MBConv(nn.Module): |
||||||
|
|
||||||
|
def __init__(self, in_chans, out_chans, expand_ratio, activation, drop_path): |
||||||
|
super().__init__() |
||||||
|
self.in_chans = in_chans |
||||||
|
self.hidden_chans = int(in_chans * expand_ratio) |
||||||
|
self.out_chans = out_chans |
||||||
|
|
||||||
|
self.conv1 = Conv2d_BN(in_chans, self.hidden_chans, ks=1) |
||||||
|
self.act1 = activation() |
||||||
|
|
||||||
|
self.conv2 = Conv2d_BN(self.hidden_chans, self.hidden_chans, ks=3, stride=1, pad=1, groups=self.hidden_chans) |
||||||
|
self.act2 = activation() |
||||||
|
|
||||||
|
self.conv3 = Conv2d_BN(self.hidden_chans, out_chans, ks=1, bn_weight_init=0.0) |
||||||
|
self.act3 = activation() |
||||||
|
|
||||||
|
# NOTE: `DropPath` is needed only for training. |
||||||
|
# self.drop_path = DropPath(drop_path) if drop_path > 0. else nn.Identity() |
||||||
|
self.drop_path = nn.Identity() |
||||||
|
|
||||||
|
def forward(self, x): |
||||||
|
shortcut = x |
||||||
|
|
||||||
|
x = self.conv1(x) |
||||||
|
x = self.act1(x) |
||||||
|
|
||||||
|
x = self.conv2(x) |
||||||
|
x = self.act2(x) |
||||||
|
|
||||||
|
x = self.conv3(x) |
||||||
|
|
||||||
|
x = self.drop_path(x) |
||||||
|
|
||||||
|
x += shortcut |
||||||
|
x = self.act3(x) |
||||||
|
|
||||||
|
return x |
||||||
|
|
||||||
|
|
||||||
|
class PatchMerging(nn.Module): |
||||||
|
|
||||||
|
def __init__(self, input_resolution, dim, out_dim, activation): |
||||||
|
super().__init__() |
||||||
|
|
||||||
|
self.input_resolution = input_resolution |
||||||
|
self.dim = dim |
||||||
|
self.out_dim = out_dim |
||||||
|
self.act = activation() |
||||||
|
self.conv1 = Conv2d_BN(dim, out_dim, 1, 1, 0) |
||||||
|
stride_c = 2 |
||||||
|
if (out_dim == 320 or out_dim == 448 or out_dim == 576): |
||||||
|
stride_c = 1 |
||||||
|
self.conv2 = Conv2d_BN(out_dim, out_dim, 3, stride_c, 1, groups=out_dim) |
||||||
|
self.conv3 = Conv2d_BN(out_dim, out_dim, 1, 1, 0) |
||||||
|
|
||||||
|
def forward(self, x): |
||||||
|
if x.ndim == 3: |
||||||
|
H, W = self.input_resolution |
||||||
|
B = len(x) |
||||||
|
# (B, C, H, W) |
||||||
|
x = x.view(B, H, W, -1).permute(0, 3, 1, 2) |
||||||
|
|
||||||
|
x = self.conv1(x) |
||||||
|
x = self.act(x) |
||||||
|
|
||||||
|
x = self.conv2(x) |
||||||
|
x = self.act(x) |
||||||
|
x = self.conv3(x) |
||||||
|
x = x.flatten(2).transpose(1, 2) |
||||||
|
return x |
||||||
|
|
||||||
|
|
||||||
|
class ConvLayer(nn.Module): |
||||||
|
|
||||||
|
def __init__( |
||||||
|
self, |
||||||
|
dim, |
||||||
|
input_resolution, |
||||||
|
depth, |
||||||
|
activation, |
||||||
|
drop_path=0., |
||||||
|
downsample=None, |
||||||
|
use_checkpoint=False, |
||||||
|
out_dim=None, |
||||||
|
conv_expand_ratio=4., |
||||||
|
): |
||||||
|
|
||||||
|
super().__init__() |
||||||
|
self.dim = dim |
||||||
|
self.input_resolution = input_resolution |
||||||
|
self.depth = depth |
||||||
|
self.use_checkpoint = use_checkpoint |
||||||
|
|
||||||
|
# build blocks |
||||||
|
self.blocks = nn.ModuleList([ |
||||||
|
MBConv( |
||||||
|
dim, |
||||||
|
dim, |
||||||
|
conv_expand_ratio, |
||||||
|
activation, |
||||||
|
drop_path[i] if isinstance(drop_path, list) else drop_path, |
||||||
|
) for i in range(depth)]) |
||||||
|
|
||||||
|
# patch merging layer |
||||||
|
if downsample is not None: |
||||||
|
self.downsample = downsample(input_resolution, dim=dim, out_dim=out_dim, activation=activation) |
||||||
|
else: |
||||||
|
self.downsample = None |
||||||
|
|
||||||
|
def forward(self, x): |
||||||
|
for blk in self.blocks: |
||||||
|
if self.use_checkpoint: |
||||||
|
x = checkpoint.checkpoint(blk, x) |
||||||
|
else: |
||||||
|
x = blk(x) |
||||||
|
if self.downsample is not None: |
||||||
|
x = self.downsample(x) |
||||||
|
return x |
||||||
|
|
||||||
|
|
||||||
|
class Mlp(nn.Module): |
||||||
|
|
||||||
|
def __init__(self, in_features, hidden_features=None, out_features=None, act_layer=nn.GELU, drop=0.): |
||||||
|
super().__init__() |
||||||
|
out_features = out_features or in_features |
||||||
|
hidden_features = hidden_features or in_features |
||||||
|
self.norm = nn.LayerNorm(in_features) |
||||||
|
self.fc1 = nn.Linear(in_features, hidden_features) |
||||||
|
self.fc2 = nn.Linear(hidden_features, out_features) |
||||||
|
self.act = act_layer() |
||||||
|
self.drop = nn.Dropout(drop) |
||||||
|
|
||||||
|
def forward(self, x): |
||||||
|
x = self.norm(x) |
||||||
|
|
||||||
|
x = self.fc1(x) |
||||||
|
x = self.act(x) |
||||||
|
x = self.drop(x) |
||||||
|
x = self.fc2(x) |
||||||
|
x = self.drop(x) |
||||||
|
return x |
||||||
|
|
||||||
|
|
||||||
|
class Attention(torch.nn.Module): |
||||||
|
|
||||||
|
def __init__( |
||||||
|
self, |
||||||
|
dim, |
||||||
|
key_dim, |
||||||
|
num_heads=8, |
||||||
|
attn_ratio=4, |
||||||
|
resolution=(14, 14), |
||||||
|
): |
||||||
|
super().__init__() |
||||||
|
# (h, w) |
||||||
|
assert isinstance(resolution, tuple) and len(resolution) == 2 |
||||||
|
self.num_heads = num_heads |
||||||
|
self.scale = key_dim ** -0.5 |
||||||
|
self.key_dim = key_dim |
||||||
|
self.nh_kd = nh_kd = key_dim * num_heads |
||||||
|
self.d = int(attn_ratio * key_dim) |
||||||
|
self.dh = int(attn_ratio * key_dim) * num_heads |
||||||
|
self.attn_ratio = attn_ratio |
||||||
|
h = self.dh + nh_kd * 2 |
||||||
|
|
||||||
|
self.norm = nn.LayerNorm(dim) |
||||||
|
self.qkv = nn.Linear(dim, h) |
||||||
|
self.proj = nn.Linear(self.dh, dim) |
||||||
|
|
||||||
|
points = list(itertools.product(range(resolution[0]), range(resolution[1]))) |
||||||
|
N = len(points) |
||||||
|
attention_offsets = {} |
||||||
|
idxs = [] |
||||||
|
for p1 in points: |
||||||
|
for p2 in points: |
||||||
|
offset = (abs(p1[0] - p2[0]), abs(p1[1] - p2[1])) |
||||||
|
if offset not in attention_offsets: |
||||||
|
attention_offsets[offset] = len(attention_offsets) |
||||||
|
idxs.append(attention_offsets[offset]) |
||||||
|
self.attention_biases = torch.nn.Parameter(torch.zeros(num_heads, len(attention_offsets))) |
||||||
|
self.register_buffer('attention_bias_idxs', torch.LongTensor(idxs).view(N, N), persistent=False) |
||||||
|
|
||||||
|
@torch.no_grad() |
||||||
|
def train(self, mode=True): |
||||||
|
super().train(mode) |
||||||
|
if mode and hasattr(self, 'ab'): |
||||||
|
del self.ab |
||||||
|
else: |
||||||
|
self.ab = self.attention_biases[:, self.attention_bias_idxs] |
||||||
|
|
||||||
|
def forward(self, x): # x (B,N,C) |
||||||
|
B, N, _ = x.shape |
||||||
|
|
||||||
|
# Normalization |
||||||
|
x = self.norm(x) |
||||||
|
|
||||||
|
qkv = self.qkv(x) |
||||||
|
# (B, N, num_heads, d) |
||||||
|
q, k, v = qkv.view(B, N, self.num_heads, -1).split([self.key_dim, self.key_dim, self.d], dim=3) |
||||||
|
# (B, num_heads, N, d) |
||||||
|
q = q.permute(0, 2, 1, 3) |
||||||
|
k = k.permute(0, 2, 1, 3) |
||||||
|
v = v.permute(0, 2, 1, 3) |
||||||
|
self.ab = self.ab.to(self.attention_biases.device) |
||||||
|
|
||||||
|
attn = ((q @ k.transpose(-2, -1)) * self.scale + |
||||||
|
(self.attention_biases[:, self.attention_bias_idxs] if self.training else self.ab)) |
||||||
|
attn = attn.softmax(dim=-1) |
||||||
|
x = (attn @ v).transpose(1, 2).reshape(B, N, self.dh) |
||||||
|
x = self.proj(x) |
||||||
|
return x |
||||||
|
|
||||||
|
|
||||||
|
class TinyViTBlock(nn.Module): |
||||||
|
r""" TinyViT Block. |
||||||
|
|
||||||
|
Args: |
||||||
|
dim (int): Number of input channels. |
||||||
|
input_resolution (tuple[int, int]): Input resolution. |
||||||
|
num_heads (int): Number of attention heads. |
||||||
|
window_size (int): Window size. |
||||||
|
mlp_ratio (float): Ratio of mlp hidden dim to embedding dim. |
||||||
|
drop (float, optional): Dropout rate. Default: 0.0 |
||||||
|
drop_path (float, optional): Stochastic depth rate. Default: 0.0 |
||||||
|
local_conv_size (int): the kernel size of the convolution between |
||||||
|
Attention and MLP. Default: 3 |
||||||
|
activation (torch.nn): the activation function. Default: nn.GELU |
||||||
|
""" |
||||||
|
|
||||||
|
def __init__( |
||||||
|
self, |
||||||
|
dim, |
||||||
|
input_resolution, |
||||||
|
num_heads, |
||||||
|
window_size=7, |
||||||
|
mlp_ratio=4., |
||||||
|
drop=0., |
||||||
|
drop_path=0., |
||||||
|
local_conv_size=3, |
||||||
|
activation=nn.GELU, |
||||||
|
): |
||||||
|
super().__init__() |
||||||
|
self.dim = dim |
||||||
|
self.input_resolution = input_resolution |
||||||
|
self.num_heads = num_heads |
||||||
|
assert window_size > 0, 'window_size must be greater than 0' |
||||||
|
self.window_size = window_size |
||||||
|
self.mlp_ratio = mlp_ratio |
||||||
|
|
||||||
|
# NOTE: `DropPath` is needed only for training. |
||||||
|
# self.drop_path = DropPath(drop_path) if drop_path > 0. else nn.Identity() |
||||||
|
self.drop_path = nn.Identity() |
||||||
|
|
||||||
|
assert dim % num_heads == 0, 'dim must be divisible by num_heads' |
||||||
|
head_dim = dim // num_heads |
||||||
|
|
||||||
|
window_resolution = (window_size, window_size) |
||||||
|
self.attn = Attention(dim, head_dim, num_heads, attn_ratio=1, resolution=window_resolution) |
||||||
|
|
||||||
|
mlp_hidden_dim = int(dim * mlp_ratio) |
||||||
|
mlp_activation = activation |
||||||
|
self.mlp = Mlp(in_features=dim, hidden_features=mlp_hidden_dim, act_layer=mlp_activation, drop=drop) |
||||||
|
|
||||||
|
pad = local_conv_size // 2 |
||||||
|
self.local_conv = Conv2d_BN(dim, dim, ks=local_conv_size, stride=1, pad=pad, groups=dim) |
||||||
|
|
||||||
|
def forward(self, x): |
||||||
|
H, W = self.input_resolution |
||||||
|
B, L, C = x.shape |
||||||
|
assert L == H * W, 'input feature has wrong size' |
||||||
|
res_x = x |
||||||
|
if H == self.window_size and W == self.window_size: |
||||||
|
x = self.attn(x) |
||||||
|
else: |
||||||
|
x = x.view(B, H, W, C) |
||||||
|
pad_b = (self.window_size - H % self.window_size) % self.window_size |
||||||
|
pad_r = (self.window_size - W % self.window_size) % self.window_size |
||||||
|
padding = pad_b > 0 or pad_r > 0 |
||||||
|
|
||||||
|
if padding: |
||||||
|
x = F.pad(x, (0, 0, 0, pad_r, 0, pad_b)) |
||||||
|
|
||||||
|
pH, pW = H + pad_b, W + pad_r |
||||||
|
nH = pH // self.window_size |
||||||
|
nW = pW // self.window_size |
||||||
|
# window partition |
||||||
|
x = x.view(B, nH, self.window_size, nW, self.window_size, |
||||||
|
C).transpose(2, 3).reshape(B * nH * nW, self.window_size * self.window_size, C) |
||||||
|
x = self.attn(x) |
||||||
|
# window reverse |
||||||
|
x = x.view(B, nH, nW, self.window_size, self.window_size, C).transpose(2, 3).reshape(B, pH, pW, C) |
||||||
|
|
||||||
|
if padding: |
||||||
|
x = x[:, :H, :W].contiguous() |
||||||
|
|
||||||
|
x = x.view(B, L, C) |
||||||
|
|
||||||
|
x = res_x + self.drop_path(x) |
||||||
|
|
||||||
|
x = x.transpose(1, 2).reshape(B, C, H, W) |
||||||
|
x = self.local_conv(x) |
||||||
|
x = x.view(B, C, L).transpose(1, 2) |
||||||
|
|
||||||
|
x = x + self.drop_path(self.mlp(x)) |
||||||
|
return x |
||||||
|
|
||||||
|
def extra_repr(self) -> str: |
||||||
|
return f'dim={self.dim}, input_resolution={self.input_resolution}, num_heads={self.num_heads}, ' \ |
||||||
|
f'window_size={self.window_size}, mlp_ratio={self.mlp_ratio}' |
||||||
|
|
||||||
|
|
||||||
|
class BasicLayer(nn.Module): |
||||||
|
""" A basic TinyViT layer for one stage. |
||||||
|
|
||||||
|
Args: |
||||||
|
dim (int): Number of input channels. |
||||||
|
input_resolution (tuple[int]): Input resolution. |
||||||
|
depth (int): Number of blocks. |
||||||
|
num_heads (int): Number of attention heads. |
||||||
|
window_size (int): Local window size. |
||||||
|
mlp_ratio (float): Ratio of mlp hidden dim to embedding dim. |
||||||
|
drop (float, optional): Dropout rate. Default: 0.0 |
||||||
|
drop_path (float | tuple[float], optional): Stochastic depth rate. Default: 0.0 |
||||||
|
downsample (nn.Module | None, optional): Downsample layer at the end of the layer. Default: None |
||||||
|
use_checkpoint (bool): Whether to use checkpointing to save memory. Default: False. |
||||||
|
local_conv_size (int): the kernel size of the depthwise convolution between attention and MLP. Default: 3 |
||||||
|
activation (torch.nn): the activation function. Default: nn.GELU |
||||||
|
out_dim (int | optional): the output dimension of the layer. Default: None |
||||||
|
""" |
||||||
|
|
||||||
|
def __init__( |
||||||
|
self, |
||||||
|
dim, |
||||||
|
input_resolution, |
||||||
|
depth, |
||||||
|
num_heads, |
||||||
|
window_size, |
||||||
|
mlp_ratio=4., |
||||||
|
drop=0., |
||||||
|
drop_path=0., |
||||||
|
downsample=None, |
||||||
|
use_checkpoint=False, |
||||||
|
local_conv_size=3, |
||||||
|
activation=nn.GELU, |
||||||
|
out_dim=None, |
||||||
|
): |
||||||
|
|
||||||
|
super().__init__() |
||||||
|
self.dim = dim |
||||||
|
self.input_resolution = input_resolution |
||||||
|
self.depth = depth |
||||||
|
self.use_checkpoint = use_checkpoint |
||||||
|
|
||||||
|
# build blocks |
||||||
|
self.blocks = nn.ModuleList([ |
||||||
|
TinyViTBlock( |
||||||
|
dim=dim, |
||||||
|
input_resolution=input_resolution, |
||||||
|
num_heads=num_heads, |
||||||
|
window_size=window_size, |
||||||
|
mlp_ratio=mlp_ratio, |
||||||
|
drop=drop, |
||||||
|
drop_path=drop_path[i] if isinstance(drop_path, list) else drop_path, |
||||||
|
local_conv_size=local_conv_size, |
||||||
|
activation=activation, |
||||||
|
) for i in range(depth)]) |
||||||
|
|
||||||
|
# patch merging layer |
||||||
|
if downsample is not None: |
||||||
|
self.downsample = downsample(input_resolution, dim=dim, out_dim=out_dim, activation=activation) |
||||||
|
else: |
||||||
|
self.downsample = None |
||||||
|
|
||||||
|
def forward(self, x): |
||||||
|
for blk in self.blocks: |
||||||
|
if self.use_checkpoint: |
||||||
|
x = checkpoint.checkpoint(blk, x) |
||||||
|
else: |
||||||
|
x = blk(x) |
||||||
|
if self.downsample is not None: |
||||||
|
x = self.downsample(x) |
||||||
|
return x |
||||||
|
|
||||||
|
def extra_repr(self) -> str: |
||||||
|
return f'dim={self.dim}, input_resolution={self.input_resolution}, depth={self.depth}' |
||||||
|
|
||||||
|
|
||||||
|
class LayerNorm2d(nn.Module): |
||||||
|
|
||||||
|
def __init__(self, num_channels: int, eps: float = 1e-6) -> None: |
||||||
|
super().__init__() |
||||||
|
self.weight = nn.Parameter(torch.ones(num_channels)) |
||||||
|
self.bias = nn.Parameter(torch.zeros(num_channels)) |
||||||
|
self.eps = eps |
||||||
|
|
||||||
|
def forward(self, x: torch.Tensor) -> torch.Tensor: |
||||||
|
u = x.mean(1, keepdim=True) |
||||||
|
s = (x - u).pow(2).mean(1, keepdim=True) |
||||||
|
x = (x - u) / torch.sqrt(s + self.eps) |
||||||
|
x = self.weight[:, None, None] * x + self.bias[:, None, None] |
||||||
|
return x |
||||||
|
|
||||||
|
|
||||||
|
class TinyViT(nn.Module): |
||||||
|
|
||||||
|
def __init__( |
||||||
|
self, |
||||||
|
img_size=224, |
||||||
|
in_chans=3, |
||||||
|
num_classes=1000, |
||||||
|
embed_dims=[96, 192, 384, 768], |
||||||
|
depths=[2, 2, 6, 2], |
||||||
|
num_heads=[3, 6, 12, 24], |
||||||
|
window_sizes=[7, 7, 14, 7], |
||||||
|
mlp_ratio=4., |
||||||
|
drop_rate=0., |
||||||
|
drop_path_rate=0.1, |
||||||
|
use_checkpoint=False, |
||||||
|
mbconv_expand_ratio=4.0, |
||||||
|
local_conv_size=3, |
||||||
|
layer_lr_decay=1.0, |
||||||
|
): |
||||||
|
super().__init__() |
||||||
|
self.img_size = img_size |
||||||
|
self.num_classes = num_classes |
||||||
|
self.depths = depths |
||||||
|
self.num_layers = len(depths) |
||||||
|
self.mlp_ratio = mlp_ratio |
||||||
|
|
||||||
|
activation = nn.GELU |
||||||
|
|
||||||
|
self.patch_embed = PatchEmbed(in_chans=in_chans, |
||||||
|
embed_dim=embed_dims[0], |
||||||
|
resolution=img_size, |
||||||
|
activation=activation) |
||||||
|
|
||||||
|
patches_resolution = self.patch_embed.patches_resolution |
||||||
|
self.patches_resolution = patches_resolution |
||||||
|
|
||||||
|
# stochastic depth |
||||||
|
dpr = [x.item() for x in torch.linspace(0, drop_path_rate, sum(depths))] # stochastic depth decay rule |
||||||
|
|
||||||
|
# build layers |
||||||
|
self.layers = nn.ModuleList() |
||||||
|
for i_layer in range(self.num_layers): |
||||||
|
kwargs = dict( |
||||||
|
dim=embed_dims[i_layer], |
||||||
|
input_resolution=(patches_resolution[0] // (2 ** (i_layer - 1 if i_layer == 3 else i_layer)), |
||||||
|
patches_resolution[1] // (2 ** (i_layer - 1 if i_layer == 3 else i_layer))), |
||||||
|
# input_resolution=(patches_resolution[0] // (2 ** i_layer), |
||||||
|
# patches_resolution[1] // (2 ** i_layer)), |
||||||
|
depth=depths[i_layer], |
||||||
|
drop_path=dpr[sum(depths[:i_layer]):sum(depths[:i_layer + 1])], |
||||||
|
downsample=PatchMerging if (i_layer < self.num_layers - 1) else None, |
||||||
|
use_checkpoint=use_checkpoint, |
||||||
|
out_dim=embed_dims[min(i_layer + 1, |
||||||
|
len(embed_dims) - 1)], |
||||||
|
activation=activation, |
||||||
|
) |
||||||
|
if i_layer == 0: |
||||||
|
layer = ConvLayer( |
||||||
|
conv_expand_ratio=mbconv_expand_ratio, |
||||||
|
**kwargs, |
||||||
|
) |
||||||
|
else: |
||||||
|
layer = BasicLayer(num_heads=num_heads[i_layer], |
||||||
|
window_size=window_sizes[i_layer], |
||||||
|
mlp_ratio=self.mlp_ratio, |
||||||
|
drop=drop_rate, |
||||||
|
local_conv_size=local_conv_size, |
||||||
|
**kwargs) |
||||||
|
self.layers.append(layer) |
||||||
|
|
||||||
|
# Classifier head |
||||||
|
self.norm_head = nn.LayerNorm(embed_dims[-1]) |
||||||
|
self.head = nn.Linear(embed_dims[-1], num_classes) if num_classes > 0 else torch.nn.Identity() |
||||||
|
|
||||||
|
# init weights |
||||||
|
self.apply(self._init_weights) |
||||||
|
self.set_layer_lr_decay(layer_lr_decay) |
||||||
|
self.neck = nn.Sequential( |
||||||
|
nn.Conv2d( |
||||||
|
embed_dims[-1], |
||||||
|
256, |
||||||
|
kernel_size=1, |
||||||
|
bias=False, |
||||||
|
), |
||||||
|
LayerNorm2d(256), |
||||||
|
nn.Conv2d( |
||||||
|
256, |
||||||
|
256, |
||||||
|
kernel_size=3, |
||||||
|
padding=1, |
||||||
|
bias=False, |
||||||
|
), |
||||||
|
LayerNorm2d(256), |
||||||
|
) |
||||||
|
|
||||||
|
def set_layer_lr_decay(self, layer_lr_decay): |
||||||
|
decay_rate = layer_lr_decay |
||||||
|
|
||||||
|
# layers -> blocks (depth) |
||||||
|
depth = sum(self.depths) |
||||||
|
lr_scales = [decay_rate ** (depth - i - 1) for i in range(depth)] |
||||||
|
|
||||||
|
def _set_lr_scale(m, scale): |
||||||
|
for p in m.parameters(): |
||||||
|
p.lr_scale = scale |
||||||
|
|
||||||
|
self.patch_embed.apply(lambda x: _set_lr_scale(x, lr_scales[0])) |
||||||
|
i = 0 |
||||||
|
for layer in self.layers: |
||||||
|
for block in layer.blocks: |
||||||
|
block.apply(lambda x: _set_lr_scale(x, lr_scales[i])) |
||||||
|
i += 1 |
||||||
|
if layer.downsample is not None: |
||||||
|
layer.downsample.apply(lambda x: _set_lr_scale(x, lr_scales[i - 1])) |
||||||
|
assert i == depth |
||||||
|
for m in [self.norm_head, self.head]: |
||||||
|
m.apply(lambda x: _set_lr_scale(x, lr_scales[-1])) |
||||||
|
|
||||||
|
for k, p in self.named_parameters(): |
||||||
|
p.param_name = k |
||||||
|
|
||||||
|
def _check_lr_scale(m): |
||||||
|
for p in m.parameters(): |
||||||
|
assert hasattr(p, 'lr_scale'), p.param_name |
||||||
|
|
||||||
|
self.apply(_check_lr_scale) |
||||||
|
|
||||||
|
def _init_weights(self, m): |
||||||
|
if isinstance(m, nn.Linear): |
||||||
|
# NOTE: This initialization is needed only for training. |
||||||
|
# trunc_normal_(m.weight, std=.02) |
||||||
|
if isinstance(m, nn.Linear) and m.bias is not None: |
||||||
|
nn.init.constant_(m.bias, 0) |
||||||
|
elif isinstance(m, nn.LayerNorm): |
||||||
|
nn.init.constant_(m.bias, 0) |
||||||
|
nn.init.constant_(m.weight, 1.0) |
||||||
|
|
||||||
|
@torch.jit.ignore |
||||||
|
def no_weight_decay_keywords(self): |
||||||
|
return {'attention_biases'} |
||||||
|
|
||||||
|
def forward_features(self, x): |
||||||
|
# x: (N, C, H, W) |
||||||
|
x = self.patch_embed(x) |
||||||
|
|
||||||
|
x = self.layers[0](x) |
||||||
|
start_i = 1 |
||||||
|
|
||||||
|
for i in range(start_i, len(self.layers)): |
||||||
|
layer = self.layers[i] |
||||||
|
x = layer(x) |
||||||
|
B, _, C = x.size() |
||||||
|
x = x.view(B, 64, 64, C) |
||||||
|
x = x.permute(0, 3, 1, 2) |
||||||
|
x = self.neck(x) |
||||||
|
return x |
||||||
|
|
||||||
|
def forward(self, x): |
||||||
|
x = self.forward_features(x) |
||||||
|
return x |
||||||
Loading…
Reference in new issue