im2col.py

filter_to_2d

filter matrix -> 2d matrix

data_to_2d

NCHW image matrix -> 2d matrix

filter2d_to_orig

filter (2d matrix) -> original filter

data2d_to_orig

image (2d matrix) -> NCHW image matrix

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to perform convolution: filter2d * data2d

Test

$ python im2col.py -v