message: Fix feature fraction per tree.
diff: @@ -724,9 +724,9 @@ class GradientBoostedDecisionTreeModel(object):
  active_handlers_current_layer = (
  active_handlers_current_layer <
  self._learner_config.feature_fraction_per_tree)
  - active_handlers = array_ops.stack(active_handlers_current_layer,
  - array_ops.ones(
  - [len(handlers)], dtype=dtypes.bool))
  + active_handlers = array_ops.stack([
  + active_handlers_current_layer,
  + array_ops.ones([len(handlers)], dtype=dtypes.bool)], axis=1)
  else:
  active_handlers = array_ops.ones([len(handlers), 2], dtype=dtypes.bool)
  