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65 lines
2.3 KiB
65 lines
2.3 KiB
# Ultralytics YOLO 🚀, AGPL-3.0 license |
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from functools import partial |
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import torch |
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from ultralytics.yolo.utils import IterableSimpleNamespace, yaml_load |
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from ultralytics.yolo.utils.checks import check_yaml |
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from .trackers import BOTSORT, BYTETracker |
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TRACKER_MAP = {'bytetrack': BYTETracker, 'botsort': BOTSORT} |
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def on_predict_start(predictor, persist=False): |
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""" |
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Initialize trackers for object tracking during prediction. |
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Args: |
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predictor (object): The predictor object to initialize trackers for. |
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persist (bool, optional): Whether to persist the trackers if they already exist. Defaults to False. |
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Raises: |
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AssertionError: If the tracker_type is not 'bytetrack' or 'botsort'. |
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""" |
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if hasattr(predictor, 'trackers') and persist: |
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return |
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tracker = check_yaml(predictor.args.tracker) |
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cfg = IterableSimpleNamespace(**yaml_load(tracker)) |
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assert cfg.tracker_type in ['bytetrack', 'botsort'], \ |
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f"Only support 'bytetrack' and 'botsort' for now, but got '{cfg.tracker_type}'" |
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trackers = [] |
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for _ in range(predictor.dataset.bs): |
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tracker = TRACKER_MAP[cfg.tracker_type](args=cfg, frame_rate=30) |
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trackers.append(tracker) |
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predictor.trackers = trackers |
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def on_predict_postprocess_end(predictor): |
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"""Postprocess detected boxes and update with object tracking.""" |
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bs = predictor.dataset.bs |
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im0s = predictor.batch[1] |
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for i in range(bs): |
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det = predictor.results[i].boxes.cpu().numpy() |
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if len(det) == 0: |
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continue |
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tracks = predictor.trackers[i].update(det, im0s[i]) |
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if len(tracks) == 0: |
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continue |
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idx = tracks[:, -1].astype(int) |
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predictor.results[i] = predictor.results[i][idx] |
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predictor.results[i].update(boxes=torch.as_tensor(tracks[:, :-1])) |
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def register_tracker(model, persist): |
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""" |
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Register tracking callbacks to the model for object tracking during prediction. |
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Args: |
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model (object): The model object to register tracking callbacks for. |
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persist (bool): Whether to persist the trackers if they already exist. |
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""" |
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model.add_callback('on_predict_start', partial(on_predict_start, persist=persist)) |
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model.add_callback('on_predict_postprocess_end', on_predict_postprocess_end)
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