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_size, height, width, channels) while channels_first corresponds to inputs with shape (batch_size, channels,height, width). It defaults to the image_data_format value found in your Keras config file at ~/.keras/keras.json. If you never set it, then it will be channels_last. |
这个参数在很多层里面都有，字符串类型，'channels_last '或者'channels_first'，指定输入 层 中的数据的格式。
'channels_last '：(batch_size, height, width, channels)
'channels_first'： (batch_size, channels,height, width)
这个默认值是配置在本地的~/.keras/keras.json. 文件中，也就是如果安装好tensorflow后就已经配置好了，如果你从来没更改过，默认就是channels_last 。
以下是我的本地keras.json的配置信息。
