Refactor TFLite example. Support FP32, Fp16, INT8 models (#17317)
Co-authored-by: UltralyticsAssistant <web@ultralytics.com> Co-authored-by: Glenn Jocher <glenn.jocher@ultralytics.com>pull/17311/head
Mohammed Yasin
3 weeks ago
committed by
GitHub
parent
788387831a
commit
d28caa9a58
5 changed files with 277 additions and 374 deletions
@ -1,65 +0,0 @@ |
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# YOLOv8 - Int8-TFLite Runtime |
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Welcome to the YOLOv8 Int8 TFLite Runtime for efficient and optimized object detection project. This README provides comprehensive instructions for installing and using our YOLOv8 implementation. |
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## Installation |
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Ensure a smooth setup by following these steps to install necessary dependencies. |
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### Installing Required Dependencies |
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Install all required dependencies with this simple command: |
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```bash |
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pip install -r requirements.txt |
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``` |
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### Installing `tflite-runtime` |
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To load TFLite models, install the `tflite-runtime` package using: |
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```bash |
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pip install tflite-runtime |
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``` |
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### Installing `tensorflow-gpu` (For NVIDIA GPU Users) |
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Leverage GPU acceleration with NVIDIA GPUs by installing `tensorflow-gpu`: |
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```bash |
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pip install tensorflow-gpu |
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``` |
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**Note:** Ensure you have compatible GPU drivers installed on your system. |
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### Installing `tensorflow` (CPU Version) |
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For CPU usage or non-NVIDIA GPUs, install TensorFlow with: |
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```bash |
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pip install tensorflow |
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``` |
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## Usage |
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Follow these instructions to run YOLOv8 after successful installation. |
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Convert the YOLOv8 model to Int8 TFLite format: |
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```bash |
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yolo export model=yolov8n.pt imgsz=640 format=tflite int8 |
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``` |
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Locate the Int8 TFLite model in `yolov8n_saved_model`. Choose `best_full_integer_quant` or verify quantization at [Netron](https://netron.app/). Then, execute the following in your terminal: |
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```bash |
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python main.py --model yolov8n_full_integer_quant.tflite --img image.jpg --conf-thres 0.5 --iou-thres 0.5 |
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``` |
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Replace `best_full_integer_quant.tflite` with your model file's path, `image.jpg` with your input image, and adjust the confidence (conf-thres) and IoU thresholds (iou-thres) as necessary. |
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### Output |
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The output is displayed as annotated images, showcasing the model's detection capabilities: |
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 |
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# Ultralytics YOLO 🚀, AGPL-3.0 license |
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import argparse |
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import cv2 |
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import numpy as np |
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from tflite_runtime import interpreter as tflite |
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from ultralytics.utils import ASSETS, yaml_load |
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from ultralytics.utils.checks import check_yaml |
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# Declare as global variables, can be updated based trained model image size |
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img_width = 640 |
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img_height = 640 |
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class LetterBox: |
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"""Resizes and reshapes images while maintaining aspect ratio by adding padding, suitable for YOLO models.""" |
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def __init__( |
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self, new_shape=(img_width, img_height), auto=False, scaleFill=False, scaleup=True, center=True, stride=32 |
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): |
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"""Initializes LetterBox with parameters for reshaping and transforming image while maintaining aspect ratio.""" |
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self.new_shape = new_shape |
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self.auto = auto |
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self.scaleFill = scaleFill |
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self.scaleup = scaleup |
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self.stride = stride |
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self.center = center # Put the image in the middle or top-left |
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def __call__(self, labels=None, image=None): |
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"""Return updated labels and image with added border.""" |
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if labels is None: |
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labels = {} |
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img = labels.get("img") if image is None else image |
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shape = img.shape[:2] # current shape [height, width] |
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new_shape = labels.pop("rect_shape", self.new_shape) |
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if isinstance(new_shape, int): |
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new_shape = (new_shape, new_shape) |
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# Scale ratio (new / old) |
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r = min(new_shape[0] / shape[0], new_shape[1] / shape[1]) |
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if not self.scaleup: # only scale down, do not scale up (for better val mAP) |
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r = min(r, 1.0) |
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# Compute padding |
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ratio = r, r # width, height ratios |
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new_unpad = int(round(shape[1] * r)), int(round(shape[0] * r)) |
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dw, dh = new_shape[1] - new_unpad[0], new_shape[0] - new_unpad[1] # wh padding |
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if self.auto: # minimum rectangle |
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dw, dh = np.mod(dw, self.stride), np.mod(dh, self.stride) # wh padding |
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elif self.scaleFill: # stretch |
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dw, dh = 0.0, 0.0 |
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new_unpad = (new_shape[1], new_shape[0]) |
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ratio = new_shape[1] / shape[1], new_shape[0] / shape[0] # width, height ratios |
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if self.center: |
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dw /= 2 # divide padding into 2 sides |
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dh /= 2 |
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if shape[::-1] != new_unpad: # resize |
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img = cv2.resize(img, new_unpad, interpolation=cv2.INTER_LINEAR) |
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top, bottom = int(round(dh - 0.1)) if self.center else 0, int(round(dh + 0.1)) |
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left, right = int(round(dw - 0.1)) if self.center else 0, int(round(dw + 0.1)) |
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img = cv2.copyMakeBorder( |
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img, top, bottom, left, right, cv2.BORDER_CONSTANT, value=(114, 114, 114) |
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) # add border |
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if labels.get("ratio_pad"): |
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labels["ratio_pad"] = (labels["ratio_pad"], (left, top)) # for evaluation |
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if len(labels): |
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labels = self._update_labels(labels, ratio, dw, dh) |
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labels["img"] = img |
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labels["resized_shape"] = new_shape |
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return labels |
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else: |
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return img |
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def _update_labels(self, labels, ratio, padw, padh): |
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"""Update labels.""" |
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labels["instances"].convert_bbox(format="xyxy") |
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labels["instances"].denormalize(*labels["img"].shape[:2][::-1]) |
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labels["instances"].scale(*ratio) |
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labels["instances"].add_padding(padw, padh) |
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return labels |
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class Yolov8TFLite: |
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"""Class for performing object detection using YOLOv8 model converted to TensorFlow Lite format.""" |
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def __init__(self, tflite_model, input_image, confidence_thres, iou_thres): |
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""" |
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Initializes an instance of the Yolov8TFLite class. |
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Args: |
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tflite_model: Path to the TFLite model. |
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input_image: Path to the input image. |
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confidence_thres: Confidence threshold for filtering detections. |
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iou_thres: IoU (Intersection over Union) threshold for non-maximum suppression. |
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""" |
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self.tflite_model = tflite_model |
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self.input_image = input_image |
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self.confidence_thres = confidence_thres |
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self.iou_thres = iou_thres |
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# Load the class names from the COCO dataset |
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self.classes = yaml_load(check_yaml("coco8.yaml"))["names"] |
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# Generate a color palette for the classes |
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self.color_palette = np.random.uniform(0, 255, size=(len(self.classes), 3)) |
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def draw_detections(self, img, box, score, class_id): |
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""" |
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Draws bounding boxes and labels on the input image based on the detected objects. |
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Args: |
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img: The input image to draw detections on. |
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box: Detected bounding box. |
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score: Corresponding detection score. |
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class_id: Class ID for the detected object. |
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Returns: |
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None |
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""" |
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# Extract the coordinates of the bounding box |
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x1, y1, w, h = box |
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# Retrieve the color for the class ID |
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color = self.color_palette[class_id] |
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# Draw the bounding box on the image |
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cv2.rectangle(img, (int(x1), int(y1)), (int(x1 + w), int(y1 + h)), color, 2) |
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# Create the label text with class name and score |
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label = f"{self.classes[class_id]}: {score:.2f}" |
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# Calculate the dimensions of the label text |
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(label_width, label_height), _ = cv2.getTextSize(label, cv2.FONT_HERSHEY_SIMPLEX, 0.5, 1) |
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# Calculate the position of the label text |
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label_x = x1 |
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label_y = y1 - 10 if y1 - 10 > label_height else y1 + 10 |
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# Draw a filled rectangle as the background for the label text |
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cv2.rectangle( |
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img, |
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(int(label_x), int(label_y - label_height)), |
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(int(label_x + label_width), int(label_y + label_height)), |
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color, |
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cv2.FILLED, |
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) |
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# Draw the label text on the image |
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cv2.putText(img, label, (int(label_x), int(label_y)), cv2.FONT_HERSHEY_SIMPLEX, 0.5, (0, 0, 0), 1, cv2.LINE_AA) |
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def preprocess(self): |
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""" |
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Preprocesses the input image before performing inference. |
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Returns: |
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image_data: Preprocessed image data ready for inference. |
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""" |
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# Read the input image using OpenCV |
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self.img = cv2.imread(self.input_image) |
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print("image before", self.img) |
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# Get the height and width of the input image |
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self.img_height, self.img_width = self.img.shape[:2] |
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letterbox = LetterBox(new_shape=[img_width, img_height], auto=False, stride=32) |
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image = letterbox(image=self.img) |
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image = [image] |
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image = np.stack(image) |
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image = image[..., ::-1].transpose((0, 3, 1, 2)) |
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img = np.ascontiguousarray(image) |
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# n, h, w, c |
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image = img.astype(np.float32) |
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return image / 255 |
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def postprocess(self, input_image, output): |
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""" |
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Performs post-processing on the model's output to extract bounding boxes, scores, and class IDs. |
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Args: |
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input_image (numpy.ndarray): The input image. |
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output (numpy.ndarray): The output of the model. |
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Returns: |
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numpy.ndarray: The input image with detections drawn on it. |
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""" |
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# Transpose predictions outside the loop |
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output = [np.transpose(pred) for pred in output] |
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boxes = [] |
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scores = [] |
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class_ids = [] |
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# Vectorize extraction of bounding boxes, scores, and class IDs |
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for pred in output: |
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x, y, w, h = pred[:, 0], pred[:, 1], pred[:, 2], pred[:, 3] |
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x1 = x - w / 2 |
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y1 = y - h / 2 |
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boxes.extend(np.column_stack([x1, y1, w, h])) |
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# Argmax and score extraction for all predictions at once |
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idx = np.argmax(pred[:, 4:], axis=1) |
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scores.extend(pred[np.arange(pred.shape[0]), idx + 4]) |
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class_ids.extend(idx) |
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# Precompute gain and pad once |
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img_height, img_width = input_image.shape[:2] |
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gain = min(img_width / self.img_width, img_height / self.img_height) |
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pad = ( |
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round((img_width - self.img_width * gain) / 2 - 0.1), |
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round((img_height - self.img_height * gain) / 2 - 0.1), |
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) |
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# Non-Maximum Suppression (NMS) in one go |
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indices = cv2.dnn.NMSBoxes(boxes, scores, self.confidence_thres, self.iou_thres) |
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# Process selected indices |
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for i in indices.flatten(): |
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box = boxes[i] |
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box[0] = (box[0] - pad[0]) / gain |
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box[1] = (box[1] - pad[1]) / gain |
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box[2] = box[2] / gain |
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box[3] = box[3] / gain |
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score = scores[i] |
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class_id = class_ids[i] |
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if score > 0.25: |
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# Draw the detection on the input image |
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self.draw_detections(input_image, box, score, class_id) |
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return input_image |
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def main(self): |
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""" |
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Performs inference using a TFLite model and returns the output image with drawn detections. |
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Returns: |
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output_img: The output image with drawn detections. |
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""" |
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# Create an interpreter for the TFLite model |
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interpreter = tflite.Interpreter(model_path=self.tflite_model) |
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self.model = interpreter |
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interpreter.allocate_tensors() |
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# Get the model inputs |
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input_details = interpreter.get_input_details() |
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output_details = interpreter.get_output_details() |
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# Store the shape of the input for later use |
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input_shape = input_details[0]["shape"] |
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self.input_width = input_shape[1] |
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self.input_height = input_shape[2] |
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# Preprocess the image data |
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img_data = self.preprocess() |
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img_data = img_data |
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# img_data = img_data.cpu().numpy() |
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# Set the input tensor to the interpreter |
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print(input_details[0]["index"]) |
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print(img_data.shape) |
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img_data = img_data.transpose((0, 2, 3, 1)) |
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scale, zero_point = input_details[0]["quantization"] |
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img_data_int8 = (img_data / scale + zero_point).astype(np.int8) |
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interpreter.set_tensor(input_details[0]["index"], img_data_int8) |
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# Run inference |
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interpreter.invoke() |
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# Get the output tensor from the interpreter |
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output = interpreter.get_tensor(output_details[0]["index"]) |
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scale, zero_point = output_details[0]["quantization"] |
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output = (output.astype(np.float32) - zero_point) * scale |
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output[:, [0, 2]] *= img_width |
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output[:, [1, 3]] *= img_height |
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print(output) |
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# Perform post-processing on the outputs to obtain output image. |
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return self.postprocess(self.img, output) |
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if __name__ == "__main__": |
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# Create an argument parser to handle command-line arguments |
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parser = argparse.ArgumentParser() |
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parser.add_argument( |
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"--model", type=str, default="yolov8n_full_integer_quant.tflite", help="Input your TFLite model." |
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) |
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parser.add_argument("--img", type=str, default=str(ASSETS / "bus.jpg"), help="Path to input image.") |
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parser.add_argument("--conf-thres", type=float, default=0.5, help="Confidence threshold") |
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parser.add_argument("--iou-thres", type=float, default=0.5, help="NMS IoU threshold") |
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args = parser.parse_args() |
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# Create an instance of the Yolov8TFLite class with the specified arguments |
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detection = Yolov8TFLite(args.model, args.img, args.conf_thres, args.iou_thres) |
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# Perform object detection and obtain the output image |
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output_image = detection.main() |
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# Display the output image in a window |
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cv2.imshow("Output", output_image) |
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# Wait for a key press to exit |
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cv2.waitKey(0) |
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@ -0,0 +1,55 @@ |
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# YOLOv8 - TFLite Runtime |
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This example shows how to run inference with YOLOv8 TFLite model. It supports FP32, FP16 and INT8 models. |
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## Installation |
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### Installing `tflite-runtime` |
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To load TFLite models, install the `tflite-runtime` package using: |
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```bash |
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pip install tflite-runtime |
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``` |
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|
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### Installing `tensorflow-gpu` (For NVIDIA GPU Users) |
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Leverage GPU acceleration with NVIDIA GPUs by installing `tensorflow-gpu`: |
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```bash |
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pip install tensorflow-gpu |
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``` |
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**Note:** Ensure you have compatible GPU drivers installed on your system. |
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|
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### Installing `tensorflow` (CPU Version) |
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For CPU usage or non-NVIDIA GPUs, install TensorFlow with: |
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```bash |
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pip install tensorflow |
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``` |
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|
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## Usage |
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|
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Follow these instructions to run YOLOv8 after successful installation. |
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Convert the YOLOv8 model to TFLite format: |
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|
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```bash |
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yolo export model=yolov8n.pt imgsz=640 format=tflite int8 |
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``` |
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Locate the TFLite model in `yolov8n_saved_model`. Then, execute the following in your terminal: |
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```bash |
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python main.py --model yolov8n_full_integer_quant.tflite --img image.jpg --conf 0.25 --iou 0.45 --metadata "metadata.yaml" |
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``` |
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Replace `best_full_integer_quant.tflite` with the TFLite model path, `image.jpg` with the input image path, `metadata.yaml` with the one generated by `ultralytics` during export, and adjust the confidence (conf) and IoU thresholds (iou) as necessary. |
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### Output |
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The output would show the detections along with the class labels and confidences of each detected object. |
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 |
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@ -0,0 +1,221 @@ |
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# Ultralytics YOLO 🚀, AGPL-3.0 license |
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import argparse |
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from typing import Tuple, Union |
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import cv2 |
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import numpy as np |
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import tensorflow as tf |
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import yaml |
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from ultralytics.utils import ASSETS |
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try: |
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from tflite_runtime.interpreter import Interpreter |
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except ImportError: |
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import tensorflow as tf |
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Interpreter = tf.lite.Interpreter |
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class YOLOv8TFLite: |
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""" |
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YOLOv8TFLite. |
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A class for performing object detection using the YOLOv8 model with TensorFlow Lite. |
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Attributes: |
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model (str): Path to the TensorFlow Lite model file. |
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conf (float): Confidence threshold for filtering detections. |
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iou (float): Intersection over Union threshold for non-maximum suppression. |
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metadata (Optional[str]): Path to the metadata file, if any. |
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Methods: |
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detect(img_path: str) -> np.ndarray: |
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Performs inference and returns the output image with drawn detections. |
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""" |
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def __init__(self, model: str, conf: float = 0.25, iou: float = 0.45, metadata: Union[str, None] = None): |
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""" |
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Initializes an instance of the YOLOv8TFLite class. |
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Args: |
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model (str): Path to the TFLite model. |
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conf (float, optional): Confidence threshold for filtering detections. Defaults to 0.25. |
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iou (float, optional): IoU (Intersection over Union) threshold for non-maximum suppression. Defaults to 0.45. |
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metadata (Union[str, None], optional): Path to the metadata file or None if not used. Defaults to None. |
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""" |
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self.conf = conf |
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self.iou = iou |
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if metadata is None: |
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self.classes = {i: i for i in range(1000)} |
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else: |
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with open(metadata) as f: |
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self.classes = yaml.safe_load(f)["names"] |
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np.random.seed(42) |
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self.color_palette = np.random.uniform(128, 255, size=(len(self.classes), 3)) |
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self.model = Interpreter(model_path=model) |
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self.model.allocate_tensors() |
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input_details = self.model.get_input_details()[0] |
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self.in_width, self.in_height = input_details["shape"][1:3] |
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self.in_index = input_details["index"] |
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self.in_scale, self.in_zero_point = input_details["quantization"] |
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self.int8 = input_details["dtype"] == np.int8 |
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output_details = self.model.get_output_details()[0] |
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self.out_index = output_details["index"] |
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self.out_scale, self.out_zero_point = output_details["quantization"] |
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|
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def letterbox(self, img: np.ndarray, new_shape: Tuple = (640, 640)) -> Tuple[np.ndarray, Tuple[float, float]]: |
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"""Resizes and reshapes images while maintaining aspect ratio by adding padding, suitable for YOLO models.""" |
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shape = img.shape[:2] # current shape [height, width] |
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|
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# Scale ratio (new / old) |
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r = min(new_shape[0] / shape[0], new_shape[1] / shape[1]) |
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|
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# Compute padding |
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new_unpad = int(round(shape[1] * r)), int(round(shape[0] * r)) |
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dw, dh = (new_shape[1] - new_unpad[0]) / 2, (new_shape[0] - new_unpad[1]) / 2 # wh padding |
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|
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if shape[::-1] != new_unpad: # resize |
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img = cv2.resize(img, new_unpad, interpolation=cv2.INTER_LINEAR) |
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top, bottom = int(round(dh - 0.1)), int(round(dh + 0.1)) |
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left, right = int(round(dw - 0.1)), int(round(dw + 0.1)) |
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img = cv2.copyMakeBorder(img, top, bottom, left, right, cv2.BORDER_CONSTANT, value=(114, 114, 114)) |
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|
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return img, (top / img.shape[0], left / img.shape[1]) |
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|
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def draw_detections(self, img: np.ndarray, box: np.ndarray, score: np.float32, class_id: int) -> None: |
||||
""" |
||||
Draws bounding boxes and labels on the input image based on the detected objects. |
||||
|
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Args: |
||||
img (np.ndarray): The input image to draw detections on. |
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box (np.ndarray): Detected bounding box in the format [x1, y1, width, height]. |
||||
score (np.float32): Corresponding detection score. |
||||
class_id (int): Class ID for the detected object. |
||||
|
||||
Returns: |
||||
None |
||||
""" |
||||
x1, y1, w, h = box |
||||
color = self.color_palette[class_id] |
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|
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cv2.rectangle(img, (int(x1), int(y1)), (int(x1 + w), int(y1 + h)), color, 2) |
||||
|
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label = f"{self.classes[class_id]}: {score:.2f}" |
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|
||||
(label_width, label_height), _ = cv2.getTextSize(label, cv2.FONT_HERSHEY_SIMPLEX, 0.5, 1) |
||||
|
||||
label_x = x1 |
||||
label_y = y1 - 10 if y1 - 10 > label_height else y1 + 10 |
||||
|
||||
cv2.rectangle( |
||||
img, |
||||
(int(label_x), int(label_y - label_height)), |
||||
(int(label_x + label_width), int(label_y + label_height)), |
||||
color, |
||||
cv2.FILLED, |
||||
) |
||||
|
||||
cv2.putText(img, label, (int(label_x), int(label_y)), cv2.FONT_HERSHEY_SIMPLEX, 0.5, (0, 0, 0), 1, cv2.LINE_AA) |
||||
|
||||
def preprocess(self, img: np.ndarray) -> Tuple[np.ndarray, Tuple[float, float]]: |
||||
""" |
||||
Preprocesses the input image before performing inference. |
||||
|
||||
Args: |
||||
img (np.ndarray): The input image to be preprocessed. |
||||
|
||||
Returns: |
||||
Tuple[np.ndarray, Tuple[float, float]]: A tuple containing: |
||||
- The preprocessed image (np.ndarray). |
||||
- A tuple of two float values representing the padding applied (top/bottom, left/right). |
||||
""" |
||||
img, pad = self.letterbox(img, (self.in_width, self.in_height)) |
||||
img = img[..., ::-1][None] # N,H,W,C for TFLite |
||||
img = np.ascontiguousarray(img) |
||||
img = img.astype(np.float32) |
||||
return img / 255, pad |
||||
|
||||
def postprocess(self, img: np.ndarray, outputs: np.ndarray, pad: Tuple[float, float]) -> np.ndarray: |
||||
""" |
||||
Performs post-processing on the model's output to extract bounding boxes, scores, and class IDs. |
||||
|
||||
Args: |
||||
img (numpy.ndarray): The input image. |
||||
outputs (numpy.ndarray): The output of the model. |
||||
pad (Tuple[float, float]): Padding used by letterbox. |
||||
|
||||
Returns: |
||||
numpy.ndarray: The input image with detections drawn on it. |
||||
""" |
||||
outputs[:, 0] -= pad[1] |
||||
outputs[:, 1] -= pad[0] |
||||
outputs[:, :4] *= max(img.shape) |
||||
|
||||
outputs = outputs.transpose(0, 2, 1) |
||||
outputs[..., 0] -= outputs[..., 2] / 2 |
||||
outputs[..., 1] -= outputs[..., 3] / 2 |
||||
|
||||
for out in outputs: |
||||
scores = out[:, 4:].max(-1) |
||||
keep = scores > self.conf |
||||
boxes = out[keep, :4] |
||||
scores = scores[keep] |
||||
class_ids = out[keep, 4:].argmax(-1) |
||||
|
||||
indices = cv2.dnn.NMSBoxes(boxes, scores, self.conf, self.iou).flatten() |
||||
|
||||
[self.draw_detections(img, boxes[i], scores[i], class_ids[i]) for i in indices] |
||||
|
||||
return img |
||||
|
||||
def detect(self, img_path: str) -> np.ndarray: |
||||
""" |
||||
Performs inference using a TFLite model and returns the output image with drawn detections. |
||||
|
||||
Args: |
||||
img_path (str): The path to the input image file. |
||||
|
||||
Returns: |
||||
np.ndarray: The output image with drawn detections. |
||||
""" |
||||
img = cv2.imread(img_path) |
||||
x, pad = self.preprocess(img) |
||||
if self.int8: |
||||
x = (x / self.in_scale + self.in_zero_point).astype(np.int8) |
||||
self.model.set_tensor(self.in_index, x) |
||||
|
||||
self.model.invoke() |
||||
|
||||
y = self.model.get_tensor(self.out_index) |
||||
|
||||
if self.int8: |
||||
y = (y.astype(np.float32) - self.out_zero_point) * self.out_scale |
||||
|
||||
return self.postprocess(img, y, pad) |
||||
|
||||
|
||||
if __name__ == "__main__": |
||||
parser = argparse.ArgumentParser() |
||||
parser.add_argument( |
||||
"--model", |
||||
type=str, |
||||
default="yolov8n_saved_model/yolov8n_full_integer_quant.tflite", |
||||
help="Path to TFLite model.", |
||||
) |
||||
parser.add_argument("--img", type=str, default=str(ASSETS / "bus.jpg"), help="Path to input image") |
||||
parser.add_argument("--conf", type=float, default=0.25, help="Confidence threshold") |
||||
parser.add_argument("--iou", type=float, default=0.45, help="NMS IoU threshold") |
||||
parser.add_argument("--metadata", type=str, default="yolov8n_saved_model/metadata.yaml", help="Metadata yaml") |
||||
args = parser.parse_args() |
||||
|
||||
detector = YOLOv8TFLite(args.model, args.conf, args.iou, args.metadata) |
||||
result = detector.detect(str(ASSETS / "bus.jpg"))[..., ::-1] |
||||
|
||||
cv2.imshow("Output", result) |
||||
cv2.waitKey(0) |
||||
Loading…
Reference in new issue