python深度学习tensorflow卷积层示例教程_python_

conv2d( input, filter, strides, padding, use_cudnn_on_gpu=None, data_format=None, name=None )

conv1=tf.nn.conv2d(x, W, strides=[1, 1, 1, 1], padding='SAME')

conv2d( inputs, filters, kernel_size, strides=(1, 1), padding='valid', data_format='channels_last', dilation_rate=(1, 1), activation=None, use_bias=True, kernel_initializer=None, bias_initializer=tf.zeros_initializer(), kernel_regularizer=None, bias_regularizer=None, activity_regularizer=None, trainable=True, name=None, reuse=None )

# Copyright 2015 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. # ============================================================================= # pylint: disable=unused-import,g-bad-import-order """Contains the convolutional layer classes and their functional aliases. """ from __future__ import absolute_import from __future__ import division from __future__ import print_function import six from six.moves import xrange # pylint: disable=redefined-builtin import numpy as np from tensorflow.python.framework import ops from tensorflow.python.ops import array_ops from tensorflow.python.ops import control_flow_ops from tensorflow.python.ops import nn from tensorflow.python.ops import math_ops from tensorflow.python.ops import init_ops from tensorflow.python.ops import standard_ops from tensorflow.python.ops import variable_scope as vs from tensorflow.python.layers import base from tensorflow.python.layers import utils class _Conv(base._Layer): # pylint: disable=protected-access """Abstract nD convolution layer (private, used as implementation base). This layer creates a convolution kernel that is convolved (actually cross-correlated) with the layer input to produce a tensor of outputs. If `use_bias` is True (and a `bias_initializer` is provided), a bias vector is created and added to the outputs. Finally, if `activation` is not `None`, it is applied to the outputs as well. Arguments: rank: An integer, the rank of the convolution, e.g. "2" for 2D convolution. filters: Integer, the dimensionality of the output space (i.e. the number of filters in the convolution). kernel_size: An integer or tuple/list of n integers, specifying the length of the convolution window. strides: An integer or tuple/list of n integers, specifying the stride length of the convolution. Specifying any stride value != 1 is incompatible with specifying any `dilation_rate` value != 1. padding: One of `"valid"` or `"same"` (case-insensitive). data_format: A string, one of `channels_last` (default) or `channels_first`. The ordering of the dimensions in the inputs. `channels_last` corresponds to inputs with shape `(batch, ..., channels)` while `channels_first` corresponds to inputs with shape `(batch, channels, ...)`. dilation_rate: An integer or tuple/list of n integers, specifying the dilation rate to use for dilated convolution. Currently, specifying any `dilation_rate` value != 1 is incompatible with specifying any `strides` value != 1. activation: Activation function. Set it to None to maintain a linear activation. use_bias: Boolean, whether the layer uses a bias. kernel_initializer: An initializer for the convolution kernel. bias_initializer: An initializer for the bias vector. If None, no bias will be applied. kernel_regularizer: Optional regularizer for the convolution kernel. bias_regularizer: Optional regularizer for the bias vector. activity_regularizer: Regularizer function for the output. trainable: Boolean, if `True` also add variables to the graph collection `GraphKeys.TRAINABLE_VARIABLES` (see `tf.Variable`). name: A string, the name of the layer. """ def __init__(self, rank, filters, kernel_size, strides=1, padding='valid', data_format='channels_last', dilation_rate=1, activation=None, use_bias=True, kernel_initializer=None, bias_initializer=init_ops.zeros_initializer(), kernel_regularizer=None, bias_regularizer=None, activity_regularizer=None, trainable=True, name=None, **kwargs): super(_Conv, self).__init__(trainable=trainable, name=name, **kwargs) self.rank = rank self.filters = filters self.kernel_size = utils.normalize_tuple(kernel_size, rank, 'kernel_size') self.strides = utils.normalize_tuple(strides, rank, 'strides') self.padding = utils.normalize_padding(padding) self.data_format = utils.normalize_data_format(data_format) self.dilation_rate = utils.normalize_tuple( dilation_rate, rank, 'dilation_rate') self.activation = activation self.use_bias = use_bias self.kernel_initializer = kernel_initializer self.bias_initializer = bias_initializer self.kernel_regularizer = kernel_regularizer self.bias_regularizer = bias_regularizer self.activity_regularizer = activity_regularizer def build(self, input_shape): if len(input_shape) != self.rank + 2: raise ValueError('Inputs should have rank ' + str(self.rank + 2) + 'Received input shape:', str(input_shape)) if self.data_format == 'channels_first': channel_axis = 1 else: channel_axis = -1 if input_shape[channel_axis] is None: raise ValueError('The channel dimension of the inputs ' 'should be defined. Found `None`.') input_dim = input_shape[channel_axis] kernel_shape = self.kernel_size + (input_dim, self.filters) self.kernel = vs.get_variable('kernel', shape=kernel_shape, initializer=self.kernel_initializer, regularizer=self.kernel_regularizer, trainable=True, dtype=self.dtype) if self.use_bias: self.bias = vs.get_variable('bias', shape=(self.filters,), initializer=self.bias_initializer, regularizer=self.bias_regularizer, trainable=True, dtype=self.dtype) else: self.bias = None def call(self, inputs): outputs = nn.convolution( input=inputs, filter=self.kernel, dilation_rate=self.dilation_rate, strides=self.strides, padding=self.padding.upper(), data_format=utils.convert_data_format(self.data_format, self.rank + 2)) if self.bias is not None: if self.rank != 2 and self.data_format == 'channels_first': # bias_add does not support channels_first for non-4D inputs. if self.rank == 1: bias = array_ops.reshape(self.bias, (1, self.filters, 1)) if self.rank == 3: bias = array_ops.reshape(self.bias, (1, self.filters, 1, 1)) outputs += bias else: outputs = nn.bias_add( outputs, self.bias, data_format=utils.convert_data_format(self.data_format, 4)) # Note that we passed rank=4 because bias_add will only accept # NHWC and NCWH even if the rank of the inputs is 3 or 5. if self.activation is not None: return self.activation(outputs) return outputs class Conv1D(_Conv): """1D convolution layer (e.g. temporal convolution). This layer creates a convolution kernel that is convolved (actually cross-correlated) with the layer input to produce a tensor of outputs. If `use_bias` is True (and a `bias_initializer` is provided), a bias vector is created and added to the outputs. Finally, if `activation` is not `None`, it is applied to the outputs as well. Arguments: filters: Integer, the dimensionality of the output space (i.e. the number of filters in the convolution). kernel_size: An integer or tuple/list of a single integer, specifying the length of the 1D convolution window. strides: An integer or tuple/list of a single integer, specifying the stride length of the convolution. Specifying any stride value != 1 is incompatible with specifying any `dilation_rate` value != 1. padding: One of `"valid"` or `"same"` (case-insensitive). data_format: A string, one of `channels_last` (default) or `channels_first`. The ordering of the dimensions in the inputs. `channels_last` corresponds to inputs with shape `(batch, length, channels)` while `channels_first` corresponds to inputs with shape `(batch, channels, length)`. dilat
                
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