org.apache.spark.ml.regression

Class GBTRegressionModel

Object

org.apache.spark.ml.PipelineStage

org.apache.spark.ml.Transformer

org.apache.spark.ml.Model<M>

org.apache.spark.ml.PredictionModel<Vector,GBTRegressionModel>

org.apache.spark.ml.regression.GBTRegressionModel

All Implemented Interfaces:

java.io.Serializable, Logging, Params, Identifiable, MLWritable

public class GBTRegressionModel
extends PredictionModel<Vector,GBTRegressionModel>
implements MLWritable, scala.Serializable

Gradient-Boosted Trees (GBTs) model for regression. It supports both continuous and categorical features. param: _trees Decision trees in the ensemble. param: _treeWeights Weights for the decision trees in the ensemble.

See Also:

Serialized Form

Constructor Summary

Constructors

Constructor and Description
GBTRegressionModel(String uid, DecisionTreeRegressionModel[] _trees, double[] _treeWeights) Construct a GBTRegressionModel

Method Summary

Modifier and Type	Method and Description
static BooleanParam	cacheNodeIds()
static IntParam	checkpointInterval()
static Params	clear(Param<?> param)
GBTRegressionModel	copy(ParamMap extra) Creates a copy of this instance with the same UID and some extra params.
double[]	evaluateEachIteration(Dataset<?> dataset, String loss) Method to compute error or loss for every iteration of gradient boosting.
static String	explainParam(Param<?> param)
static String	explainParams()
static ParamMap	extractParamMap()
static ParamMap	extractParamMap(ParamMap extra)
Vector	featureImportances() Estimate of the importance of each feature.
static Param<String>	featuresCol()
static Param<String>	featureSubsetStrategy()
static <T> scala.Option<T>	get(Param<T> param)
static boolean	getCacheNodeIds()
static int	getCheckpointInterval()
static <T> scala.Option<T>	getDefault(Param<T> param)
static String	getFeaturesCol()
static String	getFeatureSubsetStrategy()
static String	getImpurity()
static String	getLabelCol()
static String	getLossType()
static int	getMaxBins()
static int	getMaxDepth()
static int	getMaxIter()
static int	getMaxMemoryInMB()
static double	getMinInfoGain()
static int	getMinInstancesPerNode()
int	getNumTrees() Number of trees in ensemble
static <T> T	getOrDefault(Param<T> param)
static Param<Object>	getParam(String paramName)
static String	getPredictionCol()
static long	getSeed()
static double	getStepSize()
static double	getSubsamplingRate()
static String	getValidationIndicatorCol()
static double	getValidationTol()
static <T> boolean	hasDefault(Param<T> param)
static boolean	hasParam(String paramName)
static boolean	hasParent()
static Param<String>	impurity()
static boolean	isDefined(Param<?> param)
static boolean	isSet(Param<?> param)
static Param<String>	labelCol()
static GBTRegressionModel	load(String path)
static Param<String>	lossType()
static IntParam	maxBins()
static IntParam	maxDepth()
static IntParam	maxIter()
static IntParam	maxMemoryInMB()
static DoubleParam	minInfoGain()
static IntParam	minInstancesPerNode()
int	numFeatures() Returns the number of features the model was trained on.
int	numTrees() Number of trees in ensemble
static Param<?>[]	params()
static void	parent_$eq(Estimator<M> x$1)
static Estimator<M>	parent()
double	predict(Vector features) Predict label for the given features.
static Param<String>	predictionCol()
static MLReader<GBTRegressionModel>	read()
static void	save(String path)
static LongParam	seed()
static <T> Params	set(Param<T> param, T value)
static org.apache.spark.ml.tree.DecisionTreeParams	setCacheNodeIds(boolean value)
static org.apache.spark.ml.tree.DecisionTreeParams	setCheckpointInterval(int value)
static M	setFeaturesCol(String value)
static org.apache.spark.ml.tree.TreeEnsembleParams	setFeatureSubsetStrategy(String value)
static org.apache.spark.ml.tree.TreeRegressorParams	setImpurity(String value)
static org.apache.spark.ml.tree.DecisionTreeParams	setMaxBins(int value)
static org.apache.spark.ml.tree.DecisionTreeParams	setMaxDepth(int value)
static org.apache.spark.ml.tree.GBTParams	setMaxIter(int value)
static org.apache.spark.ml.tree.DecisionTreeParams	setMaxMemoryInMB(int value)
static org.apache.spark.ml.tree.DecisionTreeParams	setMinInfoGain(double value)
static org.apache.spark.ml.tree.DecisionTreeParams	setMinInstancesPerNode(int value)
static M	setParent(Estimator<M> parent)
static M	setPredictionCol(String value)
static org.apache.spark.ml.tree.DecisionTreeParams	setSeed(long value)
static org.apache.spark.ml.tree.GBTParams	setStepSize(double value)
static org.apache.spark.ml.tree.TreeEnsembleParams	setSubsamplingRate(double value)
static DoubleParam	stepSize()
static DoubleParam	subsamplingRate()
static String	toDebugString()
String	toString()
static int	totalNumNodes()
static Dataset<Row>	transform(Dataset<?> dataset)
static Dataset<Row>	transform(Dataset<?> dataset, ParamMap paramMap)
static Dataset<Row>	transform(Dataset<?> dataset, ParamPair<?> firstParamPair, ParamPair<?>... otherParamPairs)
static Dataset<Row>	transform(Dataset<?> dataset, ParamPair<?> firstParamPair, scala.collection.Seq<ParamPair<?>> otherParamPairs)
static StructType	transformSchema(StructType schema)
DecisionTreeRegressionModel[]	trees()
double[]	treeWeights()
String	uid() An immutable unique ID for the object and its derivatives.
StructType	validateAndTransformSchema(StructType schema, boolean fitting, DataType featuresDataType) Validates and transforms the input schema with the provided param map.
static Param<String>	validationIndicatorCol()
static DoubleParam	validationTol()
MLWriter	write() Returns an MLWriter instance for this ML instance.

Methods inherited from class org.apache.spark.ml.PredictionModel

setFeaturesCol, setPredictionCol, transform, transformSchema

Methods inherited from class org.apache.spark.ml.Model

hasParent, parent, setParent

Methods inherited from class org.apache.spark.ml.Transformer

transform, transform, transform

Methods inherited from class Object

equals, getClass, hashCode, notify, notifyAll, wait, wait, wait

Methods inherited from interface org.apache.spark.ml.util.MLWritable

save

Methods inherited from interface org.apache.spark.ml.param.shared.HasLabelCol

getLabelCol, labelCol

Methods inherited from interface org.apache.spark.ml.param.shared.HasFeaturesCol

featuresCol, getFeaturesCol

Methods inherited from interface org.apache.spark.ml.param.shared.HasPredictionCol

getPredictionCol, predictionCol

Methods inherited from interface org.apache.spark.ml.param.Params

clear, copyValues, defaultCopy, defaultParamMap, explainParam, explainParams, extractParamMap, extractParamMap, get, getDefault, getOrDefault, getParam, hasDefault, hasParam, isDefined, isSet, paramMap, params, set, set, set, setDefault, setDefault, shouldOwn

Methods inherited from interface org.apache.spark.internal.Logging

initializeLogging, initializeLogIfNecessary, initializeLogIfNecessary, isTraceEnabled, log_, log, logDebug, logDebug, logError, logError, logInfo, logInfo, logName, logTrace, logTrace, logWarning, logWarning

Constructor Detail

GBTRegressionModel

public GBTRegressionModel(String uid,
                          DecisionTreeRegressionModel[] _trees,
                          double[] _treeWeights)

Construct a GBTRegressionModel

Parameters:

_trees - Decision trees in the ensemble.

_treeWeights - Weights for the decision trees in the ensemble.

uid - (undocumented)

Method Detail

read

public static MLReader<GBTRegressionModel> read()

load

public static GBTRegressionModel load(String path)

params

public static Param<?>[] params()

explainParam

public static String explainParam(Param<?> param)

explainParams

public static String explainParams()

isSet

public static final boolean isSet(Param<?> param)

isDefined

public static final boolean isDefined(Param<?> param)

hasParam

public static boolean hasParam(String paramName)

getParam

public static Param<Object> getParam(String paramName)

set

public static final <T> Params set(Param<T> param,
                                   T value)

get

public static final <T> scala.Option<T> get(Param<T> param)

clear

public static final Params clear(Param<?> param)

getOrDefault

public static final <T> T getOrDefault(Param<T> param)

getDefault

public static final <T> scala.Option<T> getDefault(Param<T> param)

hasDefault

public static final <T> boolean hasDefault(Param<T> param)

extractParamMap

public static final ParamMap extractParamMap(ParamMap extra)

extractParamMap

public static final ParamMap extractParamMap()

transform

public static Dataset<Row> transform(Dataset<?> dataset,
                                     ParamPair<?> firstParamPair,
                                     scala.collection.Seq<ParamPair<?>> otherParamPairs)

transform

public static Dataset<Row> transform(Dataset<?> dataset,
                                     ParamMap paramMap)

transform

public static Dataset<Row> transform(Dataset<?> dataset,
                                     ParamPair<?> firstParamPair,
                                     ParamPair<?>... otherParamPairs)

parent

public static Estimator<M> parent()

parent_$eq

public static void parent_$eq(Estimator<M> x$1)

setParent

public static M setParent(Estimator<M> parent)

hasParent

public static boolean hasParent()

labelCol

public static final Param<String> labelCol()

getLabelCol

public static final String getLabelCol()

featuresCol

public static final Param<String> featuresCol()

getFeaturesCol

public static final String getFeaturesCol()

predictionCol

public static final Param<String> predictionCol()

getPredictionCol

public static final String getPredictionCol()

setFeaturesCol

public static M setFeaturesCol(String value)

setPredictionCol

public static M setPredictionCol(String value)

transformSchema

public static StructType transformSchema(StructType schema)

transform

public static Dataset<Row> transform(Dataset<?> dataset)

checkpointInterval

public static final IntParam checkpointInterval()

getCheckpointInterval

public static final int getCheckpointInterval()

seed

public static final LongParam seed()

getSeed

public static final long getSeed()

maxDepth

public static final IntParam maxDepth()

maxBins

public static final IntParam maxBins()

minInstancesPerNode

public static final IntParam minInstancesPerNode()

minInfoGain

public static final DoubleParam minInfoGain()

maxMemoryInMB

public static final IntParam maxMemoryInMB()

cacheNodeIds

public static final BooleanParam cacheNodeIds()

setMaxDepth

public static org.apache.spark.ml.tree.DecisionTreeParams setMaxDepth(int value)

getMaxDepth

public static final int getMaxDepth()

setMaxBins

public static org.apache.spark.ml.tree.DecisionTreeParams setMaxBins(int value)

getMaxBins

public static final int getMaxBins()

setMinInstancesPerNode

public static org.apache.spark.ml.tree.DecisionTreeParams setMinInstancesPerNode(int value)

getMinInstancesPerNode

public static final int getMinInstancesPerNode()

setMinInfoGain

public static org.apache.spark.ml.tree.DecisionTreeParams setMinInfoGain(double value)

getMinInfoGain

public static final double getMinInfoGain()

setSeed

public static org.apache.spark.ml.tree.DecisionTreeParams setSeed(long value)

setMaxMemoryInMB

public static org.apache.spark.ml.tree.DecisionTreeParams setMaxMemoryInMB(int value)

getMaxMemoryInMB

public static final int getMaxMemoryInMB()

setCacheNodeIds

public static org.apache.spark.ml.tree.DecisionTreeParams setCacheNodeIds(boolean value)

getCacheNodeIds

public static final boolean getCacheNodeIds()

setCheckpointInterval

public static org.apache.spark.ml.tree.DecisionTreeParams setCheckpointInterval(int value)

subsamplingRate

public static final DoubleParam subsamplingRate()

setSubsamplingRate

public static org.apache.spark.ml.tree.TreeEnsembleParams setSubsamplingRate(double value)

getSubsamplingRate

public static final double getSubsamplingRate()

featureSubsetStrategy

public static final Param<String> featureSubsetStrategy()

setFeatureSubsetStrategy

public static org.apache.spark.ml.tree.TreeEnsembleParams setFeatureSubsetStrategy(String value)

getFeatureSubsetStrategy

public static final String getFeatureSubsetStrategy()

maxIter

public static final IntParam maxIter()

getMaxIter

public static final int getMaxIter()

getStepSize

public static final double getStepSize()

validationIndicatorCol

public static final Param<String> validationIndicatorCol()

getValidationIndicatorCol

public static final String getValidationIndicatorCol()

validationTol

public static final DoubleParam validationTol()

getValidationTol

public static final double getValidationTol()

setMaxIter

public static org.apache.spark.ml.tree.GBTParams setMaxIter(int value)

stepSize

public static final DoubleParam stepSize()

setStepSize

public static org.apache.spark.ml.tree.GBTParams setStepSize(double value)

impurity

public static final Param<String> impurity()

setImpurity

public static org.apache.spark.ml.tree.TreeRegressorParams setImpurity(String value)

getImpurity

public static final String getImpurity()

lossType

public static Param<String> lossType()

getLossType

public static String getLossType()

toDebugString

public static String toDebugString()

totalNumNodes

public static int totalNumNodes()

save

public static void save(String path)
                 throws java.io.IOException

Throws:

java.io.IOException

uid

public String uid()

Description copied from interface: Identifiable

An immutable unique ID for the object and its derivatives.

Specified by:

uid in interface Identifiable

Returns:

(undocumented)

numFeatures

public int numFeatures()

Description copied from class: PredictionModel

Returns the number of features the model was trained on. If unknown, returns -1

Overrides:

numFeatures in class PredictionModel<Vector,GBTRegressionModel>

trees

public DecisionTreeRegressionModel[] trees()

getNumTrees

public int getNumTrees()

Number of trees in ensemble

Returns:

(undocumented)

treeWeights

public double[] treeWeights()

predict

public double predict(Vector features)

Description copied from class: PredictionModel

Predict label for the given features. This method is used to implement transform() and output predictionCol.

Specified by:

predict in class PredictionModel<Vector,GBTRegressionModel>

Parameters:

features - (undocumented)

Returns:

(undocumented)

numTrees

public int numTrees()

Number of trees in ensemble

copy

public GBTRegressionModel copy(ParamMap extra)

Description copied from interface: Params

Creates a copy of this instance with the same UID and some extra params. Subclasses should implement this method and set the return type properly. See defaultCopy().

Specified by:

copy in interface Params

Specified by:

copy in class Model<GBTRegressionModel>

Parameters:

extra - (undocumented)

Returns:

(undocumented)

toString

public String toString()

Specified by:

toString in interface Identifiable

Overrides:

toString in class Object

featureImportances

public Vector featureImportances()

Estimate of the importance of each feature.

Each feature's importance is the average of its importance across all trees in the ensemble The importance vector is normalized to sum to 1. This method is suggested by Hastie et al. (Hastie, Tibshirani, Friedman. "The Elements of Statistical Learning, 2nd Edition." 2001.) and follows the implementation from scikit-learn.

Returns:

(undocumented)

See Also:

DecisionTreeRegressionModel.featureImportances

evaluateEachIteration

public double[] evaluateEachIteration(Dataset<?> dataset,
                                      String loss)

Method to compute error or loss for every iteration of gradient boosting.

Parameters:

dataset - Dataset for validation.

loss - The loss function used to compute error. Supported options: squared, absolute

Returns:

(undocumented)

write

public MLWriter write()

Description copied from interface: MLWritable

Returns an MLWriter instance for this ML instance.

Specified by:

write in interface MLWritable

Returns:

(undocumented)

validateAndTransformSchema

public StructType validateAndTransformSchema(StructType schema,
                                             boolean fitting,
                                             DataType featuresDataType)

Validates and transforms the input schema with the provided param map.

Parameters:

schema - input schema

fitting - whether this is in fitting

featuresDataType - SQL DataType for FeaturesType. E.g., VectorUDT for vector features.

Returns:

output schema