1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
|
# Copyright 2018 The TensorFlow Authors. All Rights Reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
# ==============================================================================
"""Utilities related to layer/model functionality."""
# TODO(b/110718070): Move these functions back to tensorflow/python/keras/utils
# once __init__ files no longer require all of tf.keras to be imported together.
from __future__ import absolute_import
from __future__ import division
from __future__ import print_function
def is_layer(obj):
"""Implicit check for Layer-like objects."""
# TODO(b/110718070): Replace with isinstance(obj, base_layer.Layer).
return (hasattr(obj, "call")
and hasattr(obj, "build")
and hasattr(obj, "variables"))
def gather_trainable_weights(trainable, sub_layers, extra_variables):
"""Lists the trainable weights for an object with sub-layers.
Args:
trainable: Whether the object collecting the variables is trainable.
sub_layers: A flat list of Layer objects owned by this object, to collect
variables from.
extra_variables: Any extra variables to include. Their `.trainable` property
is used to categorize them.
Returns:
A list of collected trainable weights/variables.
"""
if not trainable:
return []
weights = []
for layer in sub_layers:
weights += layer.trainable_weights
trainable_extra_variables = [
v for v in extra_variables if v.trainable]
return weights + trainable_extra_variables
def gather_non_trainable_weights(trainable, sub_layers, extra_variables):
"""Lists the non-trainable weights for an object with sub-layers.
Args:
trainable: Whether the object collecting the variables is trainable.
sub_layers: A flat list of Layer objects owned by this object, to collect
variables from.
extra_variables: Any extra variables to include. Their `.trainable` property
is used to categorize them.
Returns:
A list of collected non-trainable weights/variables.
"""
trainable_extra_variables = []
non_trainable_extra_variables = []
for v in extra_variables:
if v.trainable:
trainable_extra_variables.append(v)
else:
non_trainable_extra_variables.append(v)
weights = []
for layer in sub_layers:
weights += layer.non_trainable_weights
if not trainable:
trainable_weights = []
for layer in sub_layers:
trainable_weights += layer.trainable_weights
return (trainable_weights + trainable_extra_variables
+ weights + non_trainable_extra_variables)
return weights + non_trainable_extra_variables
|
