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"""Metaclass for callback functions."""
from abc import ABC
from typing import Callable, List, Type
class Callback(ABC):
"""Metaclass for callbacks used in training."""
def on_fit_begin(self) -> None:
"""Called when fit begins."""
pass
def on_fit_end(self) -> None:
"""Called when fit ends."""
pass
def on_train_epoch_begin(self) -> None:
"""Called at the beginning of an epoch."""
pass
def on_train_epoch_end(self) -> None:
"""Called at the end of an epoch."""
pass
def on_val_epoch_begin(self) -> None:
"""Called at the beginning of an epoch."""
pass
def on_val_epoch_end(self) -> None:
"""Called at the end of an epoch."""
pass
def on_train_batch_begin(self) -> None:
"""Called at the beginning of an epoch."""
pass
def on_train_batch_end(self) -> None:
"""Called at the end of an epoch."""
pass
def on_val_batch_begin(self) -> None:
"""Called at the beginning of an epoch."""
pass
def on_val_batch_end(self) -> None:
"""Called at the end of an epoch."""
pass
class CallbackList:
"""Container for abstracting away callback calls."""
def __init__(self, callbacks: List[Callable] = None) -> None:
"""TBC."""
self._callbacks = callbacks if callbacks is not None else []
def append(self, callback: Type[Callback]) -> None:
"""Append new callback to callback list."""
self.callbacks.append(callback)
def on_fit_begin(self) -> None:
"""Called when fit begins."""
for _ in self._callbacks:
pass
def on_fit_end(self) -> None:
"""Called when fit ends."""
pass
def on_train_epoch_begin(self) -> None:
"""Called at the beginning of an epoch."""
pass
def on_train_epoch_end(self) -> None:
"""Called at the end of an epoch."""
pass
def on_val_epoch_begin(self) -> None:
"""Called at the beginning of an epoch."""
pass
def on_val_epoch_end(self) -> None:
"""Called at the end of an epoch."""
pass
def on_train_batch_begin(self) -> None:
"""Called at the beginning of an epoch."""
pass
def on_train_batch_end(self) -> None:
"""Called at the end of an epoch."""
pass
def on_val_batch_begin(self) -> None:
"""Called at the beginning of an epoch."""
pass
def on_val_batch_end(self) -> None:
"""Called at the end of an epoch."""
pass
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