[GitHub] haojin2 opened a new pull request #10931: [MXNET-349] [WIP] Histogram Operator

[GitBox <gi...@apache.org>]

haojin2 opened a new pull request #10931: [MXNET-349] [WIP] Histogram Operator
URL: https://github.com/apache/incubator-mxnet/pull/10931
 
 
   ## Description ##
   This PR implements histogram operator.
   
   ## Checklist ##
   ### Essentials ###
   - [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)
   - Nightly tests are added for complicated/long-running ones (e.g. changing distributed kvstore)
   - Build tests will be added for build configuration changes (e.g. adding a new build option with NCCL)
   - [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. 
   - For new examples, README.md is added to explain the what the example does, the source of the dataset, expected performance on test set and reference to the original paper if applicable
   - 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 ###
   - [x] Implementation of internal _histogram operator
   - [x] User-facing Python interface
   - [x] Unit tests
   
   ## Comments ##
   The user-facing interface resembles basic behaviors of Numpy's histogram: https://docs.scipy.org/doc/numpy-1.14.0/reference/generated/numpy.histogram.html.
   Three versions are supported:
   histogram(x, bins=7) - divided into 7 equal bins in the range of [x.min, x.max]
   histogram(x, bins=7, range=(a,b)) - divided into 7 equal bins in the range of [a, b], anything outside the range is ignored
   histogram(x, bins=NDArray) - bin bounds are specified by the bins NDArray.

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