[jira] [Created] (FLINK-13834) Add class for PolynomialExpansionMapper

[Shang Yuanchun (Jira)]

Xu Yang created FLINK-13834:
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             Summary: Add class for PolynomialExpansionMapper
                 Key: FLINK-13834
                 URL: https://issues.apache.org/jira/browse/FLINK-13834
             Project: Flink
          Issue Type: Sub-task
          Components: Library / Machine Learning
            Reporter: Xu Yang


Polynomial expansion is the process of expanding your features into a polynomial space, which is formulated by an n-degree combination of original dimensions. Take a 2-variable feature vector as an example: (x, y), if we want to expand it with degree 2, then we get (x, x * x, y, x * y, y * y).
 * Add PolynomialExpansionMapper for the operation of the vector polynomial expansion.
 * Add VectorPolynomialExpandParams for the parameters of PolynomialExpansionMapper.
 * Add PolynomialExpansionMapperTest for the test example.



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