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[SPARK-2433][MLLIB] fix NaiveBayesModel.predict #1453

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[SPARK-2433][MLLIB] fix NaiveBayesModel.predict #1453

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4 changes: 2 additions & 2 deletions python/pyspark/mllib/classification.py
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Original file line number Diff line number Diff line change
Expand Up @@ -84,7 +84,7 @@ class NaiveBayesModel(object):
- pi: vector of logs of class priors (dimension C)
- theta: matrix of logs of class conditional probabilities (CxD)

>>> data = array([0.0, 0.0, 1.0, 0.0, 0.0, 2.0, 1.0, 1.0, 0.0]).reshape(3,3)
>>> data = array([0.0, 0.0, 1.0, 1.0, 1.0, 0.0, 2.0, 1.0, 1.0]).reshape(3,3)
>>> model = NaiveBayes.train(sc.parallelize(data))
>>> model.predict(array([0.0, 1.0]))
0
Expand All @@ -98,7 +98,7 @@ def __init__(self, pi, theta):

def predict(self, x):
"""Return the most likely class for a data vector x"""
return numpy.argmax(self.pi + dot(x, self.theta))
return numpy.argmax(self.pi + dot(x, self.theta.transpose()))

class NaiveBayes(object):
@classmethod
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