API-Related Changes¶

H2O-3 does its best to keep backwards compatibility between major versions, but sometimes breaking changes are needed in order to improve code quality and to address issues. This section provides a list of current breaking changes between specific releases.

From 3.32.0.1¶

The deprecated``h2o-scala`` module has been removed.

From 3.30.1.2¶

The max_hit_ratio_k param is deprecated in version 3.30.1.2 and will be completely removed in the next major version, 3.32.0.1.

From 3.30.0.5¶

The h2o-scala module is deprecated in version 3.30.0.5 and will be completely removed in the next major version, 3.30.1.1.

From 3.30.0.4¶

The following options are no longer supported by native XGBoost and have been removed.

min_sum_hessian_in_leaf
min_data_in_leaf

From 3.28 or Below to 3.30¶

Java API¶

hex.grid.HyperSpaceWalker and hex.grid.HyperspaceWalker.HyperSpaceIterator interfaces have been simplified. Users implementing those interfaces directly, for example to create a custom grid search exploration algorithm, may want to look at the default implementations in h2o-core/src/main/java/hex/grid/HyperSpaceWalker.java if they are facing any issue when compiling against the new interfaces.

From 3.26 or Below to 3.28¶

Java API¶

The following classes were moved:

Until 3.26	From 3.28
`ai.h2o.automl.EventLog`	`ai.h2o.automl.events.EventLog`
`ai.h2o.automl.EventLogEntry`	`ai.h2o.automl.events.EventLogEntry`
`ai.h2o.automl.Leaderboard`	`ai.h2o.automl.leaderboard.Leaderboard`

From 3.22 or Below to 3.24¶

Java API¶

The following classes were moved and/or renamed:

Until 3.22	From 3.24
`hex.StackedEnsembleModel`	`hex.ensemble.StackedEnsembleModel`
`hex.StackedEnsembleModel.MetalearnerAlgorithm`	`hex.ensemble.Metalearner.Algorithm`
`ai.h2o.automl.AutoML.algo`	`ai.h2o.automl.Algo`

Some internal methods of StackedEnsemble and StackedEnsembleModel are no longer public, but this should not impact users.