mllib/stat/distribution.py

0001 #
0002 # Licensed to the Apache Software Foundation (ASF) under one or more
0003 # contributor license agreements.  See the NOTICE file distributed with
0004 # this work for additional information regarding copyright ownership.
0005 # The ASF licenses this file to You under the Apache License, Version 2.0
0006 # (the "License"); you may not use this file except in compliance with
0007 # the License.  You may obtain a copy of the License at
0008 #
0009 #    http://www.apache.org/licenses/LICENSE-2.0
0010 #
0011 # Unless required by applicable law or agreed to in writing, software
0012 # distributed under the License is distributed on an "AS IS" BASIS,
0013 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
0014 # See the License for the specific language governing permissions and
0015 # limitations under the License.
0016 #
0017
0018 from collections import namedtuple
0019
0020 __all__ = ['MultivariateGaussian']
0021
0022
0023 class MultivariateGaussian(namedtuple('MultivariateGaussian', ['mu', 'sigma'])):
0024
0025     """Represents a (mu, sigma) tuple
0026
0027     >>> m = MultivariateGaussian(Vectors.dense([11,12]),DenseMatrix(2, 2, (1.0, 3.0, 5.0, 2.0)))
0028     >>> (m.mu, m.sigma.toArray())
0029     (DenseVector([11.0, 12.0]), array([[ 1., 5.],[ 3., 2.]]))
0030     >>> (m[0], m[1])
0031     (DenseVector([11.0, 12.0]), array([[ 1., 5.],[ 3., 2.]]))
0032     """