yunfengzhou-hub opened a new pull request, #145:
URL: https://github.com/apache/flink-ml/pull/145

   ## What is the purpose of the change
   
   Add Transformer for DCT in Flink ML.
   
   ## Brief change log
   - Added Transformer for DCT.
   - Added java test/example for DCT.
   - Added python source/test/example for HashingTF.
   - The public interface is consistent with DCT in Spark ML.
   
   ## Does this pull request potentially affect one of the following parts:
   - Dependencies (does it add or upgrade a dependency): (yes)
   - The public API, i.e., is any changed class annotated with 
@public(Evolving): (no)
   - Does this pull request introduce a new feature? (yes)
   - If yes, how is the feature documented? (Java doc)


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