86 lines
2.8 KiB
Python
86 lines
2.8 KiB
Python
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# Copyright 2015 The TensorFlow Authors. All Rights Reserved.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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# ==============================================================================
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"""Layer that computes the maximum (element-wise) of several inputs."""
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import tensorflow.compat.v2 as tf
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from keras.layers.merging.base_merge import _Merge
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# isort: off
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from tensorflow.python.util.tf_export import keras_export
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@keras_export("keras.layers.Maximum")
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class Maximum(_Merge):
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"""Layer that computes the maximum (element-wise) a list of inputs.
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It takes as input a list of tensors, all of the same shape, and returns
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a single tensor (also of the same shape).
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>>> tf.keras.layers.Maximum()([np.arange(5).reshape(5, 1),
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... np.arange(5, 10).reshape(5, 1)])
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<tf.Tensor: shape=(5, 1), dtype=int64, numpy=
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array([[5],
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[6],
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[7],
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[8],
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[9]])>
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>>> x1 = tf.keras.layers.Dense(8)(np.arange(10).reshape(5, 2))
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>>> x2 = tf.keras.layers.Dense(8)(np.arange(10, 20).reshape(5, 2))
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>>> maxed = tf.keras.layers.Maximum()([x1, x2])
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>>> maxed.shape
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TensorShape([5, 8])
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"""
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def _merge_function(self, inputs):
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output = inputs[0]
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for i in range(1, len(inputs)):
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output = tf.maximum(output, inputs[i])
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return output
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@keras_export("keras.layers.maximum")
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def maximum(inputs, **kwargs):
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"""Functional interface to compute maximum (element-wise) list of `inputs`.
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This is equivalent to the `tf.keras.layers.Maximum` layer.
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For example:
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```python
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input1 = tf.keras.layers.Input(shape=(16,))
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x1 = tf.keras.layers.Dense(8, activation='relu')(input1) #shape=(None, 8)
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input2 = tf.keras.layers.Input(shape=(32,))
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x2 = tf.keras.layers.Dense(8, activation='relu')(input2) #shape=(None, 8)
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max_inp=tf.keras.layers.maximum([x1,x2]) #shape=(None, 8)
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out = tf.keras.layers.Dense(4)(max_inp)
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model = tf.keras.models.Model(inputs=[input1, input2], outputs=out)
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```
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Args:
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inputs: A list of input tensors of same shape.
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**kwargs: Standard layer keyword arguments.
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Returns:
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A tensor (of same shape as input tensor) with the element-wise
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maximum of the inputs.
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Raises:
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ValueError: If input tensors are of different shape.
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"""
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return Maximum(**kwargs)(inputs)
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