Add 3d correlation based on matrix multiplication
Fix errors in the gradient definition
Small fixes
Add PyDecref(cols) when an error occurs
Rename conv_gemm to corr_gemm
Update flops method
Fix typos
Add optimization for the GpuCorr3dMM
Add GpuCorr3d optimization tests
Fix subsampling in GpuCorr3dMM_gradWeigth
Update doc
Fix test precision
Update doc
Small fixes
Enable c_code_cache_version of GpuCorrMM3d
Update doc, correct link format
Merge pull request #2114 from ballasn/Corr3DMM

Add 3d correlation based on blas matrix multiplication