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* GH-2368 Adding a basic glossary GH-2368 Minor edits GH-2368 Adding missing READMEs and standardization. resolving readme updates GH-2368 Minor improvements to documentation. Improving some readmes. Further improvement for readmes. Cleaned up the documentation in 'client_example' (#2468) Update for PR Update ACRONYMS.md to remove trivial terms Update ACRONYMS.md to provide detailed explanations for BF16 and BF8 formats Apply suggestion from @spolifroni-amd Co-authored-by: spolifroni-amd <Sandra.Polifroni@amd.com> Apply suggestion from @spolifroni-amd Co-authored-by: spolifroni-amd <Sandra.Polifroni@amd.com> Update README.md to clarify CK Tile API description and remove outdated references to the Tile Engine. revise 37_transpose readme revise 36_copy readme Remove references to the Tile Engine in README files for 19_gemm_multi_d and 35_batched_transpose, and update distribution links for clarity. Remove references to the Tile Engine in multiple README files and update distribution links for consistency and clarity. Remove references to the Tile Engine in README files across multiple examples * GH-2368 Adding a basic glossary GH-2368 Minor edits GH-2368 Adding missing READMEs and standardization. resolving readme updates GH-2368 Minor improvements to documentation. Improving some readmes. Further improvement for readmes. Cleaned up the documentation in 'client_example' (#2468) Update for PR Update ACRONYMS.md to remove trivial terms Update ACRONYMS.md to provide detailed explanations for BF16 and BF8 formats Apply suggestion from @spolifroni-amd Co-authored-by: spolifroni-amd <Sandra.Polifroni@amd.com> Apply suggestion from @spolifroni-amd Co-authored-by: spolifroni-amd <Sandra.Polifroni@amd.com> Update README.md to clarify CK Tile API description and remove outdated references to the Tile Engine. revise 37_transpose readme revise 36_copy readme Remove references to the Tile Engine in README files for 19_gemm_multi_d and 35_batched_transpose, and update distribution links for clarity. Remove references to the Tile Engine in multiple README files and update distribution links for consistency and clarity. Remove references to the Tile Engine in README files across multiple examples Refine README files by removing outdated references to the Tile Engine * Updates based on PR feedback 1 * Updates based on PR feedback 2 * Updates based on PR feedback 3 * Updates based on PR feedback 4 * Updates based on PR feedback 5 * Updates based on PR feedback 6 * Updates based on PR feedback 7 * Updates based on PR feedback 8 * Content Modification of CK Tile Example * Modify the ck_tile gemm config --------- Co-authored-by: AviralGoelAMD <aviral.goel@amd.com> Co-authored-by: ThomasNing <thomas.ning@amd.com>
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Client Example: im2col and col2im Transformations
Theory
This client example demonstrates im2col (image-to-column) and col2im (column-to-image) transformations. These operations are used to convert image data into a matrix form suitable for GEMM-based convolution and reconstruct images from column representations.
Mathematical Formulation:
- im2col: Rearranges image blocks into columns, mapping a 3D/4D tensor to a 2D matrix.
- col2im: Reverses the process, mapping a 2D matrix back to an image tensor.
Algorithmic Background:
- im2col is used to lower convolution to matrix multiplication (GEMM).
- col2im is used to reconstruct the original image or feature map from the column representation.
- These transformations are essential for efficient convolution implementations on GPUs.
How to Run
Prerequisites
Please follow the instructions in the main Build Guide section as a prerequisite to building and running this example.
Build and run
cd composable_kernel/client_example/27_im2col_col2im
mkdir build && cd build
cmake -DCMAKE_CXX_COMPILER=/opt/rocm/bin/hipcc ..
make -j
# Example run (image to column)
./image_to_column
# Example run (column to image)
./column_to_image
Source Code Structure
Directory Layout
client_example/27_im2col_col2im/
├── image_to_column.cpp # im2col: image to column transformation
├── column_to_image.cpp # col2im: column to image transformation
├── CMakeLists.txt # Build configuration for the example
Key Functions
- main() (in each
.cpp):
Sets up input tensors, configures transformation parameters, launches the im2col or col2im kernel, and verifies the result. - im2col/col2im kernel invocation:
Uses the Composable Kernel device API to launch the transformation.
Additional Details
- Supports various image and patch sizes.
- Example parameters can be adjusted in the source for different workloads.
Related Examples
- 52_im2col_col2im: im2col/col2im in the main example directory
- 09_convnd_fwd: N-dimensional convolution using im2col