what do the parameters “dilation_h”、“dilation_w” mean in function im2col_cpu

[Eniac-Xie]

Hello everyone！

Could you tell me what is the purpose of the parameters “dilation_h”、“dilation_w” in function im2col_cpu：

template
void im2col_cpu(const Dtype* data_im, const int channels,
const int height, const int width, const int kernel_h, const int kernel_w,
const int pad_h, const int pad_w,
const int stride_h, const int stride_w,
const int dilation_h, const int dilation_w,
Dtype* data_col)

[shelhamer]

See #3452 and https://github.com/BVLC/caffe/blob/master/src/caffe/proto/caffe.proto#L556-L559.

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