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106 lines
3.6 KiB
106 lines
3.6 KiB
5 years ago
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from __future__ import absolute_import, division
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from .auto import tqdm as tqdm_auto
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from copy import deepcopy
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try:
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import keras
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except ImportError as e:
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try:
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from tensorflow import keras
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except ImportError:
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raise e
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__author__ = {"github.com/": ["casperdcl"]}
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__all__ = ['TqdmCallback']
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class TqdmCallback(keras.callbacks.Callback):
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"""`keras` callback for epoch and batch progress"""
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@staticmethod
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def bar2callback(bar, pop=None, delta=(lambda logs: 1)):
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def callback(_, logs=None):
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n = delta(logs)
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if logs:
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if pop:
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logs = deepcopy(logs)
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[logs.pop(i, 0) for i in pop]
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bar.set_postfix(logs, refresh=False)
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bar.update(n)
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return callback
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def __init__(self, epochs=None, data_size=None, batch_size=None, verbose=1,
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tqdm_class=tqdm_auto):
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"""
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Parameters
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----------
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epochs : int, optional
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data_size : int, optional
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Number of training pairs.
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batch_size : int, optional
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Number of training pairs per batch.
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verbose : int
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0: epoch, 1: batch (transient), 2: batch. [default: 1].
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Will be set to `0` unless both `data_size` and `batch_size`
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are given.
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tqdm_class : optional
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`tqdm` class to use for bars [default: `tqdm.auto.tqdm`].
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"""
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self.tqdm_class = tqdm_class
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self.epoch_bar = tqdm_class(total=epochs, unit='epoch')
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self.on_epoch_end = self.bar2callback(self.epoch_bar)
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if data_size and batch_size:
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self.batches = batches = (data_size + batch_size - 1) // batch_size
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else:
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self.batches = batches = None
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self.verbose = verbose
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if verbose == 1:
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self.batch_bar = tqdm_class(total=batches, unit='batch',
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leave=False)
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self.on_batch_end = self.bar2callback(
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self.batch_bar,
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pop=['batch', 'size'],
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delta=lambda logs: logs.get('size', 1))
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def on_train_begin(self, *_, **__):
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params = self.params.get
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auto_total = params('epochs', params('nb_epoch', None))
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if auto_total is not None:
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self.epoch_bar.reset(total=auto_total)
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def on_epoch_begin(self, *_, **__):
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if self.verbose:
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params = self.params.get
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total = params('samples', params(
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'nb_sample', params('steps', None))) or self.batches
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if self.verbose == 2:
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if hasattr(self, 'batch_bar'):
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self.batch_bar.close()
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self.batch_bar = self.tqdm_class(
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total=total, unit='batch', leave=True,
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unit_scale=1 / (params('batch_size', 1) or 1))
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self.on_batch_end = self.bar2callback(
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self.batch_bar,
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pop=['batch', 'size'],
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delta=lambda logs: logs.get('size', 1))
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elif self.verbose == 1:
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self.batch_bar.unit_scale = 1 / (params('batch_size', 1) or 1)
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self.batch_bar.reset(total=total)
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else:
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raise KeyError('Unknown verbosity')
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def on_train_end(self, *_, **__):
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if self.verbose:
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self.batch_bar.close()
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self.epoch_bar.close()
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@staticmethod
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def _implements_train_batch_hooks():
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return True
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@staticmethod
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def _implements_test_batch_hooks():
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return True
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@staticmethod
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def _implements_predict_batch_hooks():
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return True
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