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--- |
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title: Im2col Layer |
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--- |
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# im2col |
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* File type: `Im2col` |
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* Header: [`./include/caffe/layers/im2col_layer.hpp`](https://github.com/BVLC/caffe/blob/master/include/caffe/layers/im2col_layer.hpp) |
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* CPU implementation: [`./src/caffe/layers/im2col_layer.cpp`](https://github.com/BVLC/caffe/blob/master/src/caffe/layers/im2col_layer.cpp) |
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* CUDA GPU implementation: [`./src/caffe/layers/im2col_layer.cu`](https://github.com/BVLC/caffe/blob/master/src/caffe/layers/im2col_layer.cu) |
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`Im2col` is a helper for doing the image-to-column transformation that you most |
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likely do not need to know about. This is used in Caffe's original convolution |
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to do matrix multiplication by laying out all patches into a matrix. |
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