Add im2col

[itsubaki]

No description provided.

[codecov]

Codecov Report

Merging #14 (c9c9329) into main (e5ba425) will increase coverage by 0.45%.
The diff coverage is 100.00%.

❗ Current head c9c9329 differs from pull request most recent head 6365469. Consider uploading reports for the commit 6365469 to get more accurate results

@@            Coverage Diff             @@
##             main      #14      +/-   ##
==========================================
+ Coverage   95.45%   95.91%   +0.45%     
==========================================
  Files          31       32       +1     
  Lines         792      881      +89     
==========================================
+ Hits          756      845      +89     
  Misses         24       24              
  Partials       12       12              

Impacted Files	Coverage Δ
layer/batch_norm.go	100.00% <100.00%> (ø)
layer/conv.go	100.00% <100.00%> (ø)
math/matrix/matrix.go	100.00% <100.00%> (ø)
optimizer/adagrad.go	100.00% <100.00%> (ø)

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