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https://issues.apache.org/jira/browse/SPARK-32050?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Hyukjin Kwon resolved SPARK-32050.
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Resolution: Duplicate
> GBTClassifier not working with OnevsRest
> ----------------------------------------
>
> Key: SPARK-32050
> URL: https://issues.apache.org/jira/browse/SPARK-32050
> Project: Spark
> Issue Type: Bug
> Components: ML
> Affects Versions: 2.4.0
> Environment: spark 2.4.0
> Reporter: Raghuvarran V H
> Priority: Minor
>
> I am trying to use GBT classifier for multi class classification using
> OnevsRest
>
> {code:java}
> from pyspark.ml.classification import
> MultilayerPerceptronClassifier,OneVsRest,GBTClassifier
> from pyspark.ml import Pipeline,PipelineModel
> lr = GBTClassifier(featuresCol='features', labelCol='label',
> predictionCol='prediction', maxDepth=5,
>
> maxBins=32,minInstancesPerNode=1, minInfoGain=0.0, maxMemoryInMB=256,
> cacheNodeIds=False,checkpointInterval=10, lossType='logistic',
> maxIter=20,stepSize=0.1, seed=None,subsamplingRate=1.0,
> featureSubsetStrategy='auto')
> classifier = OneVsRest(featuresCol='features', labelCol='label',
> predictionCol='prediction', classifier=lr, weightCol=None,parallelism=1)
> pipeline = Pipeline(stages=[str_indxr,ohe,vecAssembler,normalizer,classifier])
> model = pipeline.fit(train_data)
> {code}
>
>
> When I try this I get this error:
> /opt/cloudera/parcels/CDH-6.3.1-1.cdh6.3.1.p0.1470567/lib/spark/python/pyspark/ml/classification.py
> in _fit(self, dataset)
> 1800 classifier = self.getClassifier()
> 1801 assert isinstance(classifier, HasRawPredictionCol),\
> -> 1802 "Classifier %s doesn't extend from HasRawPredictionCol." %
> type(classifier)
> 1803
> 1804 numClasses = int(dataset.agg(\{labelCol:
> "max"}).head()["max("+labelCol+")"]) + 1
> AssertionError: Classifier <class 'pyspark.ml.classification.GBTClassifier'>
> doesn't extend from HasRawPredictionCol.
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