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A class is the category for a classifier which is given by the target. The number of class to be predicted define the classification problem.
A class is also known as a label.
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from pyspark.mllib.regression import LabeledPoint
firstLabeledPoint = LabeledPoint('Play',[1,2,3])
SecondLabeledPoint = LabeledPoint('Don''t Play',[2,2,3])
firstLabeledPoint.label
firstLabeledPoint.features