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Diffstat (limited to 'examples/src/main/python/mllib/summary_statistics_example.py')
-rw-r--r-- | examples/src/main/python/mllib/summary_statistics_example.py | 42 |
1 files changed, 42 insertions, 0 deletions
diff --git a/examples/src/main/python/mllib/summary_statistics_example.py b/examples/src/main/python/mllib/summary_statistics_example.py new file mode 100644 index 0000000000..d55d1a2c2d --- /dev/null +++ b/examples/src/main/python/mllib/summary_statistics_example.py @@ -0,0 +1,42 @@ +# +# Licensed to the Apache Software Foundation (ASF) under one or more +# contributor license agreements. See the NOTICE file distributed with +# this work for additional information regarding copyright ownership. +# The ASF licenses this file to You under the Apache License, Version 2.0 +# (the "License"); you may not use this file except in compliance with +# the License. You may obtain a copy of the License at +# +# http://www.apache.org/licenses/LICENSE-2.0 +# +# Unless required by applicable law or agreed to in writing, software +# distributed under the License is distributed on an "AS IS" BASIS, +# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. +# See the License for the specific language governing permissions and +# limitations under the License. +# + +from __future__ import print_function + +from pyspark import SparkContext +# $example on$ +import numpy as np + +from pyspark.mllib.stat import Statistics +# $example off$ + +if __name__ == "__main__": + sc = SparkContext(appName="SummaryStatisticsExample") # SparkContext + + # $example on$ + mat = sc.parallelize( + [np.array([1.0, 10.0, 100.0]), np.array([2.0, 20.0, 200.0]), np.array([3.0, 30.0, 300.0])] + ) # an RDD of Vectors + + # Compute column summary statistics. + summary = Statistics.colStats(mat) + print(summary.mean()) # a dense vector containing the mean value for each column + print(summary.variance()) # column-wise variance + print(summary.numNonzeros()) # number of nonzeros in each column + # $example off$ + + sc.stop() |