moveforever opened a new pull request #18411: URL: https://github.com/apache/incubator-mxnet/pull/18411
## Description ## (Brief description on what this PR is about) In recommendation, there appear many features: - dense features, for instance, ctr, item exposure, item click, item statis features, etc. - one-hot categorical features, for instance, user's network, user's gender, item_id to score - mulit-hot categorical features, for instance, user profiles which describes interest, and there exists much interests for a user. So the length of the multi-hot categorical features is variable. The sample can be as followed.  The row is splited by ^A(\001). There are five columns. The first column is label, supporting multi labels. And the second column is dense feature, and the third column is categorical feature, and the the fourth column is multi-hot categorical feature which can be splited by comma , and the fifth column is sparse feature which is support wide input for google wide and deep model. The sample contains many formated features which are storaged by csv or sparse. So it is complicated. To high performance parse the sample, i implent c++ DataIter. Train at gpu will not be hold back by cpu parsing sample. In the meantimes, part code of dmlc-core is mended where is in https://github.com/moveforever/dmlc-core-recomm_data_iter/commit/7aa77953799d0ac152ddc5d3d32bf36988bbac36 Reference:https://github.com/apache/incubator-mxnet/issues/18346 ## Checklist ## ### Essentials ### Please feel free to remove inapplicable items for your PR. - [ ] The PR title starts with [MXNET-$JIRA_ID], where $JIRA_ID refers to the relevant [JIRA issue](https://issues.apache.org/jira/projects/MXNET/issues) created (except PRs with tiny changes) - [ ] Changes are complete (i.e. I finished coding on this PR) - [ ] All changes have test coverage: - Unit tests are added for small changes to verify correctness (e.g. adding a new operator) - Nightly tests are added for complicated/long-running ones (e.g. changing distributed kvstore) - Build tests will be added for build configuration changes (e.g. adding a new build option with NCCL) - [ ] Code is well-documented: - For user-facing API changes, API doc string has been updated. - For new C++ functions in header files, their functionalities and arguments are documented. - For new examples, README.md is added to explain the what the example does, the source of the dataset, expected performance on test set and reference to the original paper if applicable - Check the API doc at https://mxnet-ci-doc.s3-accelerate.dualstack.amazonaws.com/PR-$PR_ID/$BUILD_ID/index.html - [ ] To the best of my 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 ---------------------------------------------------------------- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. For queries about this service, please contact Infrastructure at: [email protected]
