AFTSurvivalRegression¶

class pyspark.ml.regression.AFTSurvivalRegression(*, featuresCol='features', labelCol='label', predictionCol='prediction', fitIntercept=True, maxIter=100, tol=1e-06, censorCol='censor', quantileProbabilities=[0.01, 0.05, 0.1, 0.25, 0.5, 0.75, 0.9, 0.95, 0.99], quantilesCol=None, aggregationDepth=2, maxBlockSizeInMB=0.0)[source]¶

Accelerated Failure Time (AFT) Model Survival Regression

Fit a parametric AFT survival regression model based on the Weibull distribution of the survival time.

Notes

For more information see Wikipedia page on AFT Model

Examples

>>> from pyspark.ml.linalg import Vectors
>>> df = spark.createDataFrame([
...     (1.0, Vectors.dense(1.0), 1.0),
...     (1e-40, Vectors.sparse(1, [], []), 0.0)], ["label", "features", "censor"])
>>> aftsr = AFTSurvivalRegression()
>>> aftsr.setMaxIter(10)
AFTSurvivalRegression...
>>> aftsr.getMaxIter()
10
>>> aftsr.clear(aftsr.maxIter)
>>> model = aftsr.fit(df)
>>> model.getMaxBlockSizeInMB()
0.0
>>> model.setFeaturesCol("features")
AFTSurvivalRegressionModel...
>>> model.predict(Vectors.dense(6.3))
1.0
>>> model.predictQuantiles(Vectors.dense(6.3))
DenseVector([0.0101, 0.0513, 0.1054, 0.2877, 0.6931, 1.3863, 2.3026, 2.9957, 4.6052])
>>> model.transform(df).show()
+-------+---------+------+----------+
|  label| features|censor|prediction|
+-------+---------+------+----------+
|    1.0|    [1.0]|   1.0|       1.0|
|1.0E-40|(1,[],[])|   0.0|       1.0|
+-------+---------+------+----------+
...
>>> aftsr_path = temp_path + "/aftsr"
>>> aftsr.save(aftsr_path)
>>> aftsr2 = AFTSurvivalRegression.load(aftsr_path)
>>> aftsr2.getMaxIter()
100
>>> model_path = temp_path + "/aftsr_model"
>>> model.save(model_path)
>>> model2 = AFTSurvivalRegressionModel.load(model_path)
>>> model.coefficients == model2.coefficients
True
>>> model.intercept == model2.intercept
True
>>> model.scale == model2.scale
True
>>> model.transform(df).take(1) == model2.transform(df).take(1)
True

New in version 1.6.0.

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.
`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.
`fit`(dataset[, params])	Fits a model to the input dataset with optional parameters.
`fitMultiple`(dataset, paramMaps)	Fits a model to the input dataset for each param map in paramMaps.
`getAggregationDepth`()	Gets the value of aggregationDepth or its default value.
`getCensorCol`()	Gets the value of censorCol or its default value.
`getFeaturesCol`()	Gets the value of featuresCol or its default value.
`getFitIntercept`()	Gets the value of fitIntercept or its default value.
`getLabelCol`()	Gets the value of labelCol or its default value.
`getMaxBlockSizeInMB`()	Gets the value of maxBlockSizeInMB or its default value.
`getMaxIter`()	Gets the value of maxIter 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.
`getQuantileProbabilities`()	Gets the value of quantileProbabilities or its default value.
`getQuantilesCol`()	Gets the value of quantilesCol or its default value.
`getTol`()	Gets the value of tol 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).
`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.
`setAggregationDepth`(value)	Sets the value of `aggregationDepth`.
`setCensorCol`(value)	Sets the value of `censorCol`.
`setFeaturesCol`(value)	Sets the value of `featuresCol`.
`setFitIntercept`(value)	Sets the value of `fitIntercept`.
`setLabelCol`(value)	Sets the value of `labelCol`.
`setMaxBlockSizeInMB`(value)	Sets the value of `maxBlockSizeInMB`.
`setMaxIter`(value)	Sets the value of `maxIter`.
`setParams`(*[, featuresCol, labelCol, …])	setParams(self, *, featuresCol=”features”, labelCol=”label”, predictionCol=”prediction”, fitIntercept=True, maxIter=100, tol=1E-6, censorCol=”censor”, quantileProbabilities=[0.01, 0.05, 0.1, 0.25, 0.5, 0.75, 0.9, 0.95, 0.99], quantilesCol=None, aggregationDepth=2, maxBlockSizeInMB=0.0):
`setPredictionCol`(value)	Sets the value of `predictionCol`.
`setQuantileProbabilities`(value)	Sets the value of `quantileProbabilities`.
`setQuantilesCol`(value)	Sets the value of `quantilesCol`.
`setTol`(value)	Sets the value of `tol`.
`write`()	Returns an MLWriter instance for this ML instance.

Attributes

`aggregationDepth`
`censorCol`
`featuresCol`
`fitIntercept`
`labelCol`
`maxBlockSizeInMB`
`maxIter`
`params`	Returns all params ordered by name.
`predictionCol`
`quantileProbabilities`
`quantilesCol`
`tol`

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

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

fit(dataset, params=None)¶

Fits a model to the input dataset with optional parameters.

New in version 1.3.0.

Parameters

datasetpyspark.sql.DataFrame: input dataset.
paramsdict or list or tuple, optional: an optional param map that overrides embedded params. If a list/tuple of param maps is given, this calls fit on each param map and returns a list of models.

Returns

Transformer or a list of Transformer: fitted model(s)

fitMultiple(dataset, paramMaps)¶

Fits a model to the input dataset for each param map in paramMaps.

New in version 2.3.0.

Parameters

datasetpyspark.sql.DataFrame: input dataset.
paramMapscollections.abc.Sequence: A Sequence of param maps.

Returns

_FitMultipleIterator: A thread safe iterable which contains one model for each param map. Each call to next(modelIterator) will return (index, model) where model was fit using paramMaps[index]. index values may not be sequential.

getAggregationDepth()¶: Gets the value of aggregationDepth or its default value.

getCensorCol()¶: Gets the value of censorCol or its default value.

New in version 1.6.0.

getFeaturesCol()¶: Gets the value of featuresCol or its default value.

getFitIntercept()¶: Gets the value of fitIntercept or its default value.

getLabelCol()¶: Gets the value of labelCol or its default value.

getMaxBlockSizeInMB()¶: Gets the value of maxBlockSizeInMB or its default value.

getMaxIter()¶: Gets the value of maxIter 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.

getQuantileProbabilities()¶: Gets the value of quantileProbabilities or its default value.

New in version 1.6.0.

getQuantilesCol()¶: Gets the value of quantilesCol or its default value.

New in version 1.6.0.

getTol()¶: Gets the value of tol 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).

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.

setAggregationDepth(value)[source]¶: Sets the value of aggregationDepth.

New in version 2.1.0.

setCensorCol(value)[source]¶: Sets the value of censorCol.

New in version 1.6.0.

setFeaturesCol(value)¶: Sets the value of featuresCol.

New in version 3.0.0.

setFitIntercept(value)[source]¶: Sets the value of fitIntercept.

New in version 1.6.0.

setLabelCol(value)¶: Sets the value of labelCol.

New in version 3.0.0.

setMaxBlockSizeInMB(value)[source]¶: Sets the value of maxBlockSizeInMB.

New in version 3.1.0.

setMaxIter(value)[source]¶: Sets the value of maxIter.

New in version 1.6.0.

setParams(*, featuresCol='features', labelCol='label', predictionCol='prediction', fitIntercept=True, maxIter=100, tol=1e-06, censorCol='censor', quantileProbabilities=[0.01, 0.05, 0.1, 0.25, 0.5, 0.75, 0.9, 0.95, 0.99], quantilesCol=None, aggregationDepth=2, maxBlockSizeInMB=0.0)[source]¶: setParams(self, *, featuresCol=”features”, labelCol=”label”, predictionCol=”prediction”, fitIntercept=True, maxIter=100, tol=1E-6, censorCol=”censor”, quantileProbabilities=[0.01, 0.05, 0.1, 0.25, 0.5, 0.75, 0.9, 0.95, 0.99], quantilesCol=None, aggregationDepth=2, maxBlockSizeInMB=0.0):

New in version 1.6.0.

setPredictionCol(value)¶: Sets the value of predictionCol.

New in version 3.0.0.

setQuantileProbabilities(value)[source]¶: Sets the value of quantileProbabilities.

New in version 1.6.0.

setQuantilesCol(value)[source]¶: Sets the value of quantilesCol.

New in version 1.6.0.

setTol(value)[source]¶: Sets the value of tol.

New in version 1.6.0.

write()¶: Returns an MLWriter instance for this ML instance.

Attributes Documentation

aggregationDepth = Param(parent='undefined', name='aggregationDepth', doc='suggested depth for treeAggregate (>= 2).')¶

censorCol = Param(parent='undefined', name='censorCol', doc='censor column name. The value of this column could be 0 or 1. If the value is 1, it means the event has occurred i.e. uncensored; otherwise censored.')¶

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

fitIntercept = Param(parent='undefined', name='fitIntercept', doc='whether to fit an intercept term.')¶

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

maxBlockSizeInMB = Param(parent='undefined', name='maxBlockSizeInMB', doc='maximum memory in MB for stacking input data into blocks. Data is stacked within partitions. If more than remaining data size in a partition then it is adjusted to the data size. Default 0.0 represents choosing optimal value, depends on specific algorithm. Must be >= 0.')¶

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

quantileProbabilities = Param(parent='undefined', name='quantileProbabilities', doc='quantile probabilities array. Values of the quantile probabilities array should be in the range (0, 1) and the array should be non-empty.')¶

quantilesCol = Param(parent='undefined', name='quantilesCol', doc='quantiles column name. This column will output quantiles of corresponding quantileProbabilities if it is set.')¶

tol = Param(parent='undefined', name='tol', doc='the convergence tolerance for iterative algorithms (>= 0).')¶

ALSModel AFTSurvivalRegressionModel