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## What changes were proposed in this pull request? This PR updates MLlib APIs to accept `Dataset[_]` as input where `DataFrame` was the input type. This PR doesn't change the output type. In Java, `Dataset[_]` maps to `Dataset<?>`, which includes `Dataset<Row>`. Some implementations were changed in order to return `DataFrame`. Tests and examples were updated. Note that this is a breaking change for subclasses of Transformer/Estimator. Lol, we don't have to rename the input argument, which has been `dataset` since Spark 1.2. TODOs: - [x] update MiMaExcludes (seems all covered by explicit filters from SPARK-13920) - [x] Python - [x] add a new test to accept Dataset[LabeledPoint] - [x] remove unused imports of Dataset ## How was this patch tested? Exiting unit tests with some modifications. cc: rxin jkbradley Author: Xiangrui Meng <meng@databricks.com> Closes #12274 from mengxr/SPARK-14500. |
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