GlobalAveragePooling3D
类tf_keras.layers.GlobalAveragePooling3D(data_format=None, keepdims=False, **kwargs)
针对 3D 数据的全局平均池化操作。
参数
channels_last
(默认)或 channels_first
。输入中维度的顺序。channels_last
对应形状为 (batch, spatial_dim1, spatial_dim2, spatial_dim3, channels)
的输入,而 channels_first
对应形状为 (batch, channels, spatial_dim1, spatial_dim2, spatial_dim3)
的输入。未指定时,使用位于 ~/.keras/keras.json
的 TF-Keras 配置文件中 image_data_format
的值(如果存在),否则使用 'channels_last'。默认为 'channels_last'。keepdims
为 False
(默认),则空间维度会降低张量的秩。如果 keepdims
为 True
,则空间维度将保留,长度为 1。其行为与 tf.reduce_mean
或 np.mean
相同。输入形状
data_format='channels_last'
:形状为 (batch_size, spatial_dim1, spatial_dim2, spatial_dim3, channels)
的 5D 张量data_format='channels_first'
:形状为 (batch_size, channels, spatial_dim1, spatial_dim2, spatial_dim3)
的 5D 张量输出形状
keepdims
=False:形状为 (batch_size, channels)
的 2D 张量。keepdims
=Truedata_format='channels_last'
:形状为 (batch_size, 1, 1, 1, channels)
的 5D 张量data_format='channels_first'
:形状为 (batch_size, channels, 1, 1, 1)
的 5D 张量