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122 lines
5.3 KiB
122 lines
5.3 KiB
# Ultralytics YOLO 🚀, AGPL-3.0 license
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from ultralytics.cfg import TASK2DATA, TASK2METRIC
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from ultralytics.utils import DEFAULT_CFG_DICT, LOGGER, NUM_THREADS
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def run_ray_tune(model,
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space: dict = None,
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grace_period: int = 10,
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gpu_per_trial: int = None,
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max_samples: int = 10,
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**train_args):
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"""
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Runs hyperparameter tuning using Ray Tune.
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Args:
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model (YOLO): Model to run the tuner on.
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space (dict, optional): The hyperparameter search space. Defaults to None.
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grace_period (int, optional): The grace period in epochs of the ASHA scheduler. Defaults to 10.
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gpu_per_trial (int, optional): The number of GPUs to allocate per trial. Defaults to None.
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max_samples (int, optional): The maximum number of trials to run. Defaults to 10.
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train_args (dict, optional): Additional arguments to pass to the `train()` method. Defaults to {}.
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Returns:
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(dict): A dictionary containing the results of the hyperparameter search.
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Raises:
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ModuleNotFoundError: If Ray Tune is not installed.
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"""
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if train_args is None:
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train_args = {}
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try:
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from ray import tune
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from ray.air import RunConfig
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from ray.air.integrations.wandb import WandbLoggerCallback
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from ray.tune.schedulers import ASHAScheduler
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except ImportError:
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raise ModuleNotFoundError('Tuning hyperparameters requires Ray Tune. Install with: pip install "ray[tune]"')
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try:
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import wandb
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assert hasattr(wandb, '__version__')
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except (ImportError, AssertionError):
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wandb = False
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default_space = {
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# 'optimizer': tune.choice(['SGD', 'Adam', 'AdamW', 'NAdam', 'RAdam', 'RMSProp']),
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'lr0': tune.uniform(1e-5, 1e-1),
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'lrf': tune.uniform(0.01, 1.0), # final OneCycleLR learning rate (lr0 * lrf)
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'momentum': tune.uniform(0.6, 0.98), # SGD momentum/Adam beta1
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'weight_decay': tune.uniform(0.0, 0.001), # optimizer weight decay 5e-4
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'warmup_epochs': tune.uniform(0.0, 5.0), # warmup epochs (fractions ok)
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'warmup_momentum': tune.uniform(0.0, 0.95), # warmup initial momentum
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'box': tune.uniform(0.02, 0.2), # box loss gain
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'cls': tune.uniform(0.2, 4.0), # cls loss gain (scale with pixels)
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'hsv_h': tune.uniform(0.0, 0.1), # image HSV-Hue augmentation (fraction)
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'hsv_s': tune.uniform(0.0, 0.9), # image HSV-Saturation augmentation (fraction)
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'hsv_v': tune.uniform(0.0, 0.9), # image HSV-Value augmentation (fraction)
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'degrees': tune.uniform(0.0, 45.0), # image rotation (+/- deg)
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'translate': tune.uniform(0.0, 0.9), # image translation (+/- fraction)
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'scale': tune.uniform(0.0, 0.9), # image scale (+/- gain)
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'shear': tune.uniform(0.0, 10.0), # image shear (+/- deg)
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'perspective': tune.uniform(0.0, 0.001), # image perspective (+/- fraction), range 0-0.001
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'flipud': tune.uniform(0.0, 1.0), # image flip up-down (probability)
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'fliplr': tune.uniform(0.0, 1.0), # image flip left-right (probability)
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'mosaic': tune.uniform(0.0, 1.0), # image mixup (probability)
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'mixup': tune.uniform(0.0, 1.0), # image mixup (probability)
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'copy_paste': tune.uniform(0.0, 1.0)} # segment copy-paste (probability)
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def _tune(config):
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"""
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Trains the YOLO model with the specified hyperparameters and additional arguments.
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Args:
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config (dict): A dictionary of hyperparameters to use for training.
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Returns:
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None.
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"""
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model._reset_callbacks()
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config.update(train_args)
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model.train(**config)
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# Get search space
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if not space:
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space = default_space
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LOGGER.warning('WARNING ⚠️ search space not provided, using default search space.')
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# Get dataset
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data = train_args.get('data', TASK2DATA[model.task])
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space['data'] = data
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if 'data' not in train_args:
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LOGGER.warning(f'WARNING ⚠️ data not provided, using default "data={data}".')
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# Define the trainable function with allocated resources
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trainable_with_resources = tune.with_resources(_tune, {'cpu': NUM_THREADS, 'gpu': gpu_per_trial or 0})
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# Define the ASHA scheduler for hyperparameter search
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asha_scheduler = ASHAScheduler(time_attr='epoch',
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metric=TASK2METRIC[model.task],
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mode='max',
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max_t=train_args.get('epochs') or DEFAULT_CFG_DICT['epochs'] or 100,
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grace_period=grace_period,
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reduction_factor=3)
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# Define the callbacks for the hyperparameter search
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tuner_callbacks = [WandbLoggerCallback(project='YOLOv8-tune')] if wandb else []
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# Create the Ray Tune hyperparameter search tuner
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tuner = tune.Tuner(trainable_with_resources,
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param_space=space,
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tune_config=tune.TuneConfig(scheduler=asha_scheduler, num_samples=max_samples),
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run_config=RunConfig(callbacks=tuner_callbacks, storage_path='./runs/tune'))
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# Run the hyperparameter search
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tuner.fit()
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# Return the results of the hyperparameter search
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return tuner.get_results()
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