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[SPARK-21469][ML][EXAMPLES] Adding Examples for FeatureHasher
## What changes were proposed in this pull request? This PR adds ML examples for the FeatureHasher transform in Scala, Java, Python. ## How was this patch tested? Manually ran examples and verified that output is consistent for different APIs Author: Bryan Cutler <cutlerb@gmail.com> Closes #19024 from BryanCutler/ml-examples-FeatureHasher-SPARK-21810.
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- docs/ml-features.md 87 additions, 4 deletionsdocs/ml-features.md
- examples/src/main/java/org/apache/spark/examples/ml/JavaFeatureHasherExample.java 69 additions, 0 deletions...rg/apache/spark/examples/ml/JavaFeatureHasherExample.java
- examples/src/main/python/ml/feature_hasher_example.py 46 additions, 0 deletionsexamples/src/main/python/ml/feature_hasher_example.py
- examples/src/main/scala/org/apache/spark/examples/ml/FeatureHasherExample.scala 50 additions, 0 deletions...a/org/apache/spark/examples/ml/FeatureHasherExample.scala
- mllib/src/main/scala/org/apache/spark/ml/feature/FeatureHasher.scala 4 additions, 3 deletions...ain/scala/org/apache/spark/ml/feature/FeatureHasher.scala
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