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  1. # YOLOv5 🚀 by Ultralytics, GPL-3.0 license
  2. """
  3. Callback utils
  4. """
  5. class Callbacks:
  6. """"
  7. Handles all registered callbacks for YOLOv5 Hooks
  8. """
  9. def __init__(self):
  10. # Define the available callbacks
  11. self._callbacks = {
  12. 'on_pretrain_routine_start': [],
  13. 'on_pretrain_routine_end': [],
  14. 'on_train_start': [],
  15. 'on_train_epoch_start': [],
  16. 'on_train_batch_start': [],
  17. 'optimizer_step': [],
  18. 'on_before_zero_grad': [],
  19. 'on_train_batch_end': [],
  20. 'on_train_epoch_end': [],
  21. 'on_val_start': [],
  22. 'on_val_batch_start': [],
  23. 'on_val_image_end': [],
  24. 'on_val_batch_end': [],
  25. 'on_val_end': [],
  26. 'on_fit_epoch_end': [], # fit = train + val
  27. 'on_model_save': [],
  28. 'on_train_end': [],
  29. 'on_params_update': [],
  30. 'teardown': [],}
  31. self.stop_training = False # set True to interrupt training
  32. def register_action(self, hook, name='', callback=None):
  33. """
  34. Register a new action to a callback hook
  35. Args:
  36. hook: The callback hook name to register the action to
  37. name: The name of the action for later reference
  38. callback: The callback to fire
  39. """
  40. assert hook in self._callbacks, f"hook '{hook}' not found in callbacks {self._callbacks}"
  41. assert callable(callback), f"callback '{callback}' is not callable"
  42. self._callbacks[hook].append({'name': name, 'callback': callback})
  43. def get_registered_actions(self, hook=None):
  44. """"
  45. Returns all the registered actions by callback hook
  46. Args:
  47. hook: The name of the hook to check, defaults to all
  48. """
  49. return self._callbacks[hook] if hook else self._callbacks
  50. def run(self, hook, *args, **kwargs):
  51. """
  52. Loop through the registered actions and fire all callbacks
  53. Args:
  54. hook: The name of the hook to check, defaults to all
  55. args: Arguments to receive from YOLOv5
  56. kwargs: Keyword Arguments to receive from YOLOv5
  57. """
  58. assert hook in self._callbacks, f"hook '{hook}' not found in callbacks {self._callbacks}"
  59. for logger in self._callbacks[hook]:
  60. logger['callback'](*args, **kwargs)