tf.nn.conv2d

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

padding: A string from: "SAME", "VALID". The type of padding algorithm to use.

注意padding爲same輸出feature map尺寸不變
padding爲valid則爲：（size-flitersize）/stride + 1