Function pool2d

2D Pooling. Arguments: x: Tensor or variable. pool_size: tuple of 2 integers. strides: tuple of 2 integers. padding: string, `"same"` or `"valid"`. data_format: string, `"channels_last"` or `"channels_first"`. pool_mode: string, `"max"` or `"avg"`. Returns:

(x,
           pool_size,
           strides=(1, 1),
           padding='valid',
           data_format=None,
           pool_mode='max')