[GitHub] sandeep-krishnamurthy opened a new pull request #13837: Image ToTensor operator - GPU support, 3D/4D inputs

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sandeep-krishnamurthy opened a new pull request #13837: Image ToTensor operator - GPU support, 3D/4D inputs
URL: https://github.com/apache/incubator-mxnet/pull/13837
 
 
   ## Description ##
   
   1. Make to_tensor as operator. No contribution to gradient.
   2. Support CPU and GPU. This PR adds GPU supports and re-organizes previously supported CPU.
   3. to_tensor transformation operator can take 3D (c, h, w) or 4D (n, c, h, w) at once. So that a batch of input can be passed in the transformation.
   4. Parallelization with OMP
   5. This is backward compatible change. No existing functionality will be affected.
   
   # Background 
   We can enable users to fuse transformation operators with network graph and export it. This end to end network with transforms + network will greatly simplify inference deployment.
   Related PR for normalize transformation - https://github.com/apache/incubator-mxnet/pull/13802/
   
   ## Checklist ##
   ### Essentials ###
   Please feel free to remove inapplicable items for your PR.
   - [X] Changes are complete (i.e. I finished coding on this PR)
   - [X] All changes have test coverage:
   - Unit tests are added for small changes to verify correctness (e.g. adding a new operator)
   - [X] Code is well-documented: 
   - For user-facing API changes, API doc string has been updated. 
   - For new C++ functions in header files, their functionalities and arguments are documented. 
   - Check the API doc at http://mxnet-ci-doc.s3-accelerate.dualstack.amazonaws.com/PR-$PR_ID/$BUILD_ID/index.html
   - [X] To the my best knowledge, examples are either not affected by this change, or have been fixed to be compatible with this change
   
   ### Changes ###
   - Make to_tensor to accept 3D or 4D input
   - CPU / GPU support
   - No gradient contribution
   - Reorganize like any other operators
   
   ## Comments ##
   - A related PR was raised here https://github.com/apache/incubator-mxnet/pull/13614 reviewed by @apeforest and @stu1130 - I have addressed those comments. I am closing other PR as it was mixing multiple transforms and functionality.
   
   @apeforest @stu1130 @zhreshold @nswamy - For review
   

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