This is an umbrella for improvements to learning Gradient Boosted Trees: GBTClassifier, GBTRegressor.
Note: Aspects of GBTs which are related to individual trees should be listed under SPARK-14045.
spark.ml GBT algs need to use random seed
Refine Tree Predictions in Gradient Boosting to Improve Prediction Accuracy.
Feature Importance for GBT
Support Tree-Based Feature Transformation for ML
Add instance weight support for GBTs
Predicted Probability per training instance for Gradient Boosted Trees
GradientBoostedTreesModel doesn't have featureSubsetStrategy parameter
Add random seed to GBTClassifier, GBTRegressor
Add fit with validation set to spark.ml GBT
DecisionTree improvement umbrella