org.apache.spark.ml.regression

Class DecisionTreeRegressionModel

Object

org.apache.spark.ml.PipelineStage

org.apache.spark.ml.Transformer

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

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

org.apache.spark.ml.regression.DecisionTreeRegressionModel

All Implemented Interfaces:

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

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

Decision tree (Wikipedia) model for regression. It supports both continuous and categorical features. param: rootNode Root of the decision tree

See Also:

Serialized Form

Method Summary

Modifier and Type	Method and Description
static BooleanParam	cacheNodeIds()
static IntParam	checkpointInterval()
static Params	clear(Param<?> param)
DecisionTreeRegressionModel	copy(ParamMap extra) Creates a copy of this instance with the same UID and some extra params.
static int	depth()
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 <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	getImpurity()
static String	getLabelCol()
static int	getMaxBins()
static int	getMaxDepth()
static int	getMaxMemoryInMB()
static double	getMinInfoGain()
static int	getMinInstancesPerNode()
static <T> T	getOrDefault(Param<T> param)
static Param<Object>	getParam(String paramName)
static String	getPredictionCol()
static long	getSeed()
static String	getVarianceCol()
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 DecisionTreeRegressionModel	load(String path)
static IntParam	maxBins()
static IntParam	maxDepth()
static IntParam	maxMemoryInMB()
static DoubleParam	minInfoGain()
static IntParam	minInstancesPerNode()
int	numFeatures() Returns the number of features the model was trained on.
static int	numNodes()
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<DecisionTreeRegressionModel>	read()
Node	rootNode()
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.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.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)
DecisionTreeRegressionModel	setVarianceCol(String value)
static String	toDebugString()
String	toString()
Dataset<Row>	transform(Dataset<?> dataset) Transforms dataset by reading from featuresCol, calling predict, and storing the predictions as a new column predictionCol.
static StructType	transformSchema(StructType schema)
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>	varianceCol()
MLWriter	write() Returns an MLWriter instance for this ML instance.

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

setFeaturesCol, setPredictionCol, 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

Method Detail

read

public static MLReader<DecisionTreeRegressionModel> read()

load

public static DecisionTreeRegressionModel 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()

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)

numNodes

public static int numNodes()

depth

public static int depth()

toDebugString

public static String toDebugString()

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)

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()

varianceCol

public static final Param<String> varianceCol()

getVarianceCol

public static final String getVarianceCol()

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)

rootNode

public Node rootNode()

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,DecisionTreeRegressionModel>

setVarianceCol

public DecisionTreeRegressionModel setVarianceCol(String value)

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,DecisionTreeRegressionModel>

Parameters:

features - (undocumented)

Returns:

(undocumented)

transform

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

Description copied from class: PredictionModel

Transforms dataset by reading from featuresCol, calling predict, and storing the predictions as a new column predictionCol.

Overrides:

transform in class PredictionModel<Vector,DecisionTreeRegressionModel>

Parameters:

dataset - input dataset

Returns:

transformed dataset with predictionCol of type Double

copy

public DecisionTreeRegressionModel 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<DecisionTreeRegressionModel>

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.

This generalizes the idea of "Gini" importance to other losses, following the explanation of Gini importance from "Random Forests" documentation by Leo Breiman and Adele Cutler, and following the implementation from scikit-learn.

This feature importance is calculated as follows: - importance(feature j) = sum (over nodes which split on feature j) of the gain, where gain is scaled by the number of instances passing through node - Normalize importances for tree to sum to 1.

Returns:

(undocumented)

Note:

Feature importance for single decision trees can have high variance due to correlated predictor variables. Consider using a RandomForestRegressor to determine feature importance instead.

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