GBTRegressionModel

class pyspark.ml.regression.GBTRegressionModel(java_model=None)

Model fitted by GBTRegressor.

New in version 1.4.0.

Methods

clear(param)	Clears a param from the param map if it has been explicitly set.
copy([extra])	Creates a copy of this instance with the same uid and some extra params.
evaluateEachIteration(dataset, loss)	Method to compute error or loss for every iteration of gradient boosting.
explainParam(param)	Explains a single param and returns its name, doc, and optional default value and user-supplied value in a string.
explainParams()	Returns the documentation of all params with their optionally default values and user-supplied values.
extractParamMap([extra])	Extracts the embedded default param values and user-supplied values, and then merges them with extra values from input into a flat param map, where the latter value is used if there exist conflicts, i.e., with ordering: default param values < user-supplied values < extra.
getCacheNodeIds()	Gets the value of cacheNodeIds or its default value.
getCheckpointInterval()	Gets the value of checkpointInterval or its default value.
getFeatureSubsetStrategy()	Gets the value of featureSubsetStrategy or its default value.
getFeaturesCol()	Gets the value of featuresCol or its default value.
getImpurity()	Gets the value of impurity or its default value.
getLabelCol()	Gets the value of labelCol or its default value.
getLeafCol()	Gets the value of leafCol or its default value.
getLossType()	Gets the value of lossType or its default value.
getMaxBins()	Gets the value of maxBins or its default value.
getMaxDepth()	Gets the value of maxDepth or its default value.
getMaxIter()	Gets the value of maxIter or its default value.
getMaxMemoryInMB()	Gets the value of maxMemoryInMB or its default value.
getMinInfoGain()	Gets the value of minInfoGain or its default value.
getMinInstancesPerNode()	Gets the value of minInstancesPerNode or its default value.
getMinWeightFractionPerNode()	Gets the value of minWeightFractionPerNode or its default value.
getOrDefault(param)	Gets the value of a param in the user-supplied param map or its default value.
getParam(paramName)	Gets a param by its name.
getPredictionCol()	Gets the value of predictionCol or its default value.
getSeed()	Gets the value of seed or its default value.
getStepSize()	Gets the value of stepSize or its default value.
getSubsamplingRate()	Gets the value of subsamplingRate or its default value.
getValidationIndicatorCol()	Gets the value of validationIndicatorCol or its default value.
getValidationTol()	Gets the value of validationTol or its default value.
getWeightCol()	Gets the value of weightCol or its default value.
hasDefault(param)	Checks whether a param has a default value.
hasParam(paramName)	Tests whether this instance contains a param with a given (string) name.
isDefined(param)	Checks whether a param is explicitly set by user or has a default value.
isSet(param)	Checks whether a param is explicitly set by user.
load(path)	Reads an ML instance from the input path, a shortcut of read().load(path).
predict(value)	Predict label for the given features.
predictLeaf(value)	Predict the indices of the leaves corresponding to the feature vector.
read()	Returns an MLReader instance for this class.
save(path)	Save this ML instance to the given path, a shortcut of ‘write().save(path)’.
set(param, value)	Sets a parameter in the embedded param map.
setFeaturesCol(value)	Sets the value of featuresCol.
setLeafCol(value)	Sets the value of leafCol.
setPredictionCol(value)	Sets the value of predictionCol.
transform(dataset[, params])	Transforms the input dataset with optional parameters.
write()	Returns an MLWriter instance for this ML instance.

Attributes

cacheNodeIds
checkpointInterval
featureImportances	Estimate of the importance of each feature.
featureSubsetStrategy
featuresCol
getNumTrees	Number of trees in ensemble.
impurity
labelCol
leafCol
lossType
maxBins
maxDepth
maxIter
maxMemoryInMB
minInfoGain
minInstancesPerNode
minWeightFractionPerNode
numFeatures	Returns the number of features the model was trained on.
params	Returns all params ordered by name.
predictionCol
seed
stepSize
subsamplingRate
supportedFeatureSubsetStrategies
supportedImpurities
supportedLossTypes
toDebugString	Full description of model.
totalNumNodes	Total number of nodes, summed over all trees in the ensemble.
treeWeights	Return the weights for each tree
trees	Trees in this ensemble.
validationIndicatorCol
validationTol
weightCol

Methods Documentation

clear(param)

Clears a param from the param map if it has been explicitly set.

copy(extra=None)

Creates a copy of this instance with the same uid and some extra params. This implementation first calls Params.copy and then make a copy of the companion Java pipeline component with extra params. So both the Python wrapper and the Java pipeline component get copied.

Parameters

extradict, optional

Extra parameters to copy to the new instance

Returns

JavaParams

Copy of this instance

evaluateEachIteration(dataset, loss)

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

New in version 2.4.0.

Parameters

datasetpyspark.sql.DataFrame

Test dataset to evaluate model on, where dataset is an instance of pyspark.sql.DataFrame

lossstr

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

explainParam(param)

Explains a single param and returns its name, doc, and optional default value and user-supplied value in a string.

explainParams()

Returns the documentation of all params with their optionally default values and user-supplied values.

extractParamMap(extra=None)

Extracts the embedded default param values and user-supplied values, and then merges them with extra values from input into a flat param map, where the latter value is used if there exist conflicts, i.e., with ordering: default param values < user-supplied values < extra.

Parameters

extradict, optional

extra param values

Returns

dict

merged param map

getCacheNodeIds()

Gets the value of cacheNodeIds or its default value.

getCheckpointInterval()

Gets the value of checkpointInterval or its default value.

getFeatureSubsetStrategy()

Gets the value of featureSubsetStrategy or its default value.

New in version 1.4.0.

getFeaturesCol()

Gets the value of featuresCol or its default value.

getImpurity()

Gets the value of impurity or its default value.

New in version 1.4.0.

getLabelCol()

Gets the value of labelCol or its default value.

getLeafCol()

Gets the value of leafCol or its default value.

getLossType()

Gets the value of lossType or its default value.

New in version 1.4.0.

getMaxBins()

Gets the value of maxBins or its default value.

getMaxDepth()

Gets the value of maxDepth or its default value.

getMaxIter()

Gets the value of maxIter or its default value.

getMaxMemoryInMB()

Gets the value of maxMemoryInMB or its default value.

getMinInfoGain()

Gets the value of minInfoGain or its default value.

getMinInstancesPerNode()

Gets the value of minInstancesPerNode or its default value.

getMinWeightFractionPerNode()

Gets the value of minWeightFractionPerNode or its default value.

getOrDefault(param)

Gets the value of a param in the user-supplied param map or its default value. Raises an error if neither is set.

getParam(paramName)

Gets a param by its name.

getPredictionCol()

Gets the value of predictionCol or its default value.

getSeed()

Gets the value of seed or its default value.

getStepSize()

Gets the value of stepSize or its default value.

getSubsamplingRate()

Gets the value of subsamplingRate or its default value.

New in version 1.4.0.

getValidationIndicatorCol()

Gets the value of validationIndicatorCol or its default value.

getValidationTol()

Gets the value of validationTol or its default value.

New in version 3.0.0.

getWeightCol()

Gets the value of weightCol or its default value.

hasDefault(param)

Checks whether a param has a default value.

hasParam(paramName)

Tests whether this instance contains a param with a given (string) name.

isDefined(param)

Checks whether a param is explicitly set by user or has a default value.

isSet(param)

Checks whether a param is explicitly set by user.

classmethod load(path)

Reads an ML instance from the input path, a shortcut of read().load(path).

predict(value)

Predict label for the given features.

New in version 3.0.0.

predictLeaf(value)

Predict the indices of the leaves corresponding to the feature vector.

New in version 3.0.0.

classmethod read()

Returns an MLReader instance for this class.

save(path)

Save this ML instance to the given path, a shortcut of ‘write().save(path)’.

set(param, value)

Sets a parameter in the embedded param map.

setFeaturesCol(value)

Sets the value of featuresCol.

New in version 3.0.0.

setLeafCol(value)

Sets the value of leafCol.

setPredictionCol(value)

Sets the value of predictionCol.

New in version 3.0.0.

transform(dataset, params=None)

Transforms the input dataset with optional parameters.

New in version 1.3.0.

Parameters

datasetpyspark.sql.DataFrame

input dataset

paramsdict, optional

an optional param map that overrides embedded params.

Returns

pyspark.sql.DataFrame

transformed dataset

write()

Returns an MLWriter instance for this ML instance.

Attributes Documentation

cacheNodeIds = Param(parent='undefined', name='cacheNodeIds', doc='If false, the algorithm will pass trees to executors to match instances with nodes. If true, the algorithm will cache node IDs for each instance. Caching can speed up training of deeper trees. Users can set how often should the cache be checkpointed or disable it by setting checkpointInterval.')

checkpointInterval = Param(parent='undefined', name='checkpointInterval', doc='set checkpoint interval (>= 1) or disable checkpoint (-1). E.g. 10 means that the cache will get checkpointed every 10 iterations. Note: this setting will be ignored if the checkpoint directory is not set in the SparkContext.')

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.

New in version 2.0.0.

Examples

DecisionTreeRegressionModel.featureImportances

featureSubsetStrategy = Param(parent='undefined', name='featureSubsetStrategy', doc="The number of features to consider for splits at each tree node. Supported options: 'auto' (choose automatically for task: If numTrees == 1, set to 'all'. If numTrees > 1 (forest), set to 'sqrt' for classification and to 'onethird' for regression), 'all' (use all features), 'onethird' (use 1/3 of the features), 'sqrt' (use sqrt(number of features)), 'log2' (use log2(number of features)), 'n' (when n is in the range (0, 1.0], use n * number of features. When n is in the range (1, number of features), use n features). default = 'auto'")

featuresCol = Param(parent='undefined', name='featuresCol', doc='features column name.')

getNumTrees

Number of trees in ensemble.

New in version 2.0.0.

impurity = Param(parent='undefined', name='impurity', doc='Criterion used for information gain calculation (case-insensitive). Supported options: variance')

labelCol = Param(parent='undefined', name='labelCol', doc='label column name.')

leafCol = Param(parent='undefined', name='leafCol', doc='Leaf indices column name. Predicted leaf index of each instance in each tree by preorder.')

lossType = Param(parent='undefined', name='lossType', doc='Loss function which GBT tries to minimize (case-insensitive). Supported options: squared, absolute')

maxBins = Param(parent='undefined', name='maxBins', doc='Max number of bins for discretizing continuous features. Must be >=2 and >= number of categories for any categorical feature.')

maxDepth = Param(parent='undefined', name='maxDepth', doc='Maximum depth of the tree. (>= 0) E.g., depth 0 means 1 leaf node; depth 1 means 1 internal node + 2 leaf nodes. Must be in range [0, 30].')

maxIter = Param(parent='undefined', name='maxIter', doc='max number of iterations (>= 0).')

maxMemoryInMB = Param(parent='undefined', name='maxMemoryInMB', doc='Maximum memory in MB allocated to histogram aggregation. If too small, then 1 node will be split per iteration, and its aggregates may exceed this size.')

minInfoGain = Param(parent='undefined', name='minInfoGain', doc='Minimum information gain for a split to be considered at a tree node.')

minInstancesPerNode = Param(parent='undefined', name='minInstancesPerNode', doc='Minimum number of instances each child must have after split. If a split causes the left or right child to have fewer than minInstancesPerNode, the split will be discarded as invalid. Should be >= 1.')

minWeightFractionPerNode = Param(parent='undefined', name='minWeightFractionPerNode', doc='Minimum fraction of the weighted sample count that each child must have after split. If a split causes the fraction of the total weight in the left or right child to be less than minWeightFractionPerNode, the split will be discarded as invalid. Should be in interval [0.0, 0.5).')

numFeatures

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

New in version 2.1.0.

params

Returns all params ordered by name. The default implementation uses dir() to get all attributes of type Param.

predictionCol = Param(parent='undefined', name='predictionCol', doc='prediction column name.')

seed = Param(parent='undefined', name='seed', doc='random seed.')

stepSize = Param(parent='undefined', name='stepSize', doc='Step size (a.k.a. learning rate) in interval (0, 1] for shrinking the contribution of each estimator.')

subsamplingRate = Param(parent='undefined', name='subsamplingRate', doc='Fraction of the training data used for learning each decision tree, in range (0, 1].')

supportedFeatureSubsetStrategies = ['auto', 'all', 'onethird', 'sqrt', 'log2']

supportedImpurities = ['variance']

supportedLossTypes = ['squared', 'absolute']

toDebugString

Full description of model.

New in version 2.0.0.

totalNumNodes

Total number of nodes, summed over all trees in the ensemble.

New in version 2.0.0.

treeWeights

Return the weights for each tree

New in version 1.5.0.

trees

Trees in this ensemble. Warning: These have null parent Estimators.

New in version 2.0.0.

validationIndicatorCol = Param(parent='undefined', name='validationIndicatorCol', doc='name of the column that indicates whether each row is for training or for validation. False indicates training; true indicates validation.')

validationTol = Param(parent='undefined', name='validationTol', doc='Threshold for stopping early when fit with validation is used. If the error rate on the validation input changes by less than the validationTol, then learning will stop early (before `maxIter`). This parameter is ignored when fit without validation is used.')

weightCol = Param(parent='undefined', name='weightCol', doc='weight column name. If this is not set or empty, we treat all instance weights as 1.0.')

GBTRegressor GeneralizedLinearRegression