[jira] [Created] (FLINK-13239) Add unary loss functions

[Xu Yang (JIRA)]

Xu Yang created FLINK-13239:
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             Summary: Add unary loss functions
                 Key: FLINK-13239
                 URL: https://issues.apache.org/jira/browse/FLINK-13239
             Project: Flink
          Issue Type: Sub-task
          Components: Library / Machine Learning
            Reporter: Xu Yang
            Assignee: Xu Yang


Add unary loss function's interface and 9 common used functions:
# ExponentialLossFunc
# HingeLossFunc
# LogisticLossFunc
# LogLossFunc
# PerceptronLossFunc
# ZeroOneLossFunc
# SquareLossFunc
# SvrLossFunc
# HuberLossFunc

More information about loss function, please see：
* https://en.wikipedia.org/wiki/Loss_function
* https://en.wikipedia.org/wiki/Loss_functions_for_classification



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