Seth Hendrickson created SPARK-12326:
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Summary: Move GBT implementation from spark.mllib to spark.ml
Key: SPARK-12326
URL: https://issues.apache.org/jira/browse/SPARK-12326
Project: Spark
Issue Type: Improvement
Components: ML, MLlib
Reporter: Seth Hendrickson
Several improvements can be made to gradient boosted trees, but are not
possible without moving the GBT implementation to spark.ml (e.g. rawPrediction
column, feature importance). This Jira is for moving the current GBT
implementation to spark.ml, which will have roughly the following steps:
1. Copy the implementation to spark.ml and change spark.ml classes to use that
implementation. Current tests will ensure that the implementations learn
exactly the same models.
2. Move the decision tree helper classes over to spark.ml (e.g. Impurity,
InformationGainStats, ImpurityStats, DTStatsAggregator, etc...). Since
eventually all tree implementations will reside in spark.ml, the helper classes
should as well.
3. Remove the spark.mllib implementation, and make the spark.mllib APIs
wrappers around the spark.ml implementation. The spark.ml tests will again
ensure that we do not change any behavior.
4. Move the unit tests to spark.ml, and change the spark.mllib unit tests to
verify model equivalence.
Steps 2, 3, and 4 should be in separate Jiras.
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