[GitHub] [incubator-mxnet] karan6181 opened a new pull request #14350: [MXNET-1335][WIP][fit api]Text Sentiment Classification examples using Gluon fit() API

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karan6181 opened a new pull request #14350: [MXNET-1335][WIP][fit api]Text Sentiment Classification examples using Gluon fit() API
URL: https://github.com/apache/incubator-mxnet/pull/14350
 
 
   ## Description ##
   This PR adds Text Sentiment Classification examples using Gluon fit() API. This PR depends on its parent PR([14346](https://github.com/apache/incubator-mxnet/pull/14346)).
   
   JIRA epic can be found here: <https://issues.apache.org/jira/projects/MXNET/issues/MXNET-1335>
   
   The examples has been modified from D2L Gluon [book](http://d2l.ai/chapter_natural-language-processing/index.html). This examples shows that the fit() API helps in reducing the training script by approx. 25 lines, and also the target users doesn't need to write their own training loop.
   
   Note: We have covered some of the models, more to be added soon.  
   
   ## Checklist ##
   ### Essentials ###
   Please feel free to remove inapplicable items for your PR.
   - [x] The PR title starts with [MXNET-1335](https://issues.apache.org/jira/projects/MXNET/issues/MXNET-1335)
   - [ ] Changes are complete (i.e. I finished coding on this PR)
   - [ ] 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)
   - [ ] 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
   - [ ] To the my best knowledge, examples are either not affected by this change, or have been fixed to be compatible with this change
   
   ### Changes ###
   - [ ] Feature1, tests, (and when applicable, API doc)
   - [ ] Feature2, tests, (and when applicable, API doc)
   
   ## Comments ##
   - If this change is a backward incompatible change, why must this change be made.
   - Interesting edge cases to note here
   

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