[jira] [Created] (FLINK-13911) Add the interface of ModelDataConverter, and several base classes that implement this interface.

["Xu Yang (Jira)" <ji...@apache.org>]

Xu Yang created FLINK-13911:
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             Summary: Add the interface of ModelDataConverter, and several base classes that implement this interface.
                 Key: FLINK-13911
                 URL: https://issues.apache.org/jira/browse/FLINK-13911
             Project: Flink
          Issue Type: Sub-task
          Components: Library / Machine Learning
            Reporter: Xu Yang


ModelDataConverter is an interface that defines methods for converting a generic model data object to a collection of rows and the other way around. It is used when we are exporting the model data to a table, as well as loading model data from a table for inference.
 * Add ModelDataConverter which defines the model data conversion methods.
 * Add SimpleModelDataConverter which is a specific model data converter where the model data is represented as meta data and a collection of strings.
 * Add LabeledModelDataConverter which is a specific model data converter where the model data is represented as meta data, a collection of strings, and a collection of label values.
 * Add RichModelDataConverter which is a specific model data converter where the model data is represented as meta data, a collection of strings, and a collection of auxiliary rows.
 * Add ModelConverterUtils which provides utility functions for implementing the above model data converters.



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