[jira] [Created] (FLINK-13835) Add class for FeatureHasherMapper.

[Shang Yuanchun (Jira)]

Xu Yang created FLINK-13835:
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             Summary: Add class for FeatureHasherMapper.
                 Key: FLINK-13835
                 URL: https://issues.apache.org/jira/browse/FLINK-13835
             Project: Flink
          Issue Type: Sub-task
          Components: Library / Machine Learning
            Reporter: Xu Yang


FeatureHasherMapper is a transformer to project a number of categorical or numerical features into a feature vector of a specified dimension.
 * Add FeatureHasherMapper for the operation of the FeatureHasherMapper.
 * Add FeatureHasherParams for the params of FeatureHasherMapper.
 * Add FeatureHasherMapperTest for the test example.



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