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Diffstat (limited to 'examples/src/main/python/mllib/stratified_sampling_example.py')
-rw-r--r-- | examples/src/main/python/mllib/stratified_sampling_example.py | 38 |
1 files changed, 38 insertions, 0 deletions
diff --git a/examples/src/main/python/mllib/stratified_sampling_example.py b/examples/src/main/python/mllib/stratified_sampling_example.py new file mode 100644 index 0000000000..a13f8f08dd --- /dev/null +++ b/examples/src/main/python/mllib/stratified_sampling_example.py @@ -0,0 +1,38 @@ +# +# 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 + +if __name__ == "__main__": + sc = SparkContext(appName="StratifiedSamplingExample") # SparkContext + + # $example on$ + # an RDD of any key value pairs + data = sc.parallelize([(1, 'a'), (1, 'b'), (2, 'c'), (2, 'd'), (2, 'e'), (3, 'f')]) + + # specify the exact fraction desired from each key as a dictionary + fractions = {1: 0.1, 2: 0.6, 3: 0.3} + + approxSample = data.sampleByKey(False, fractions) + # $example off$ + + for each in approxSample.collect(): + print(each) + + sc.stop() |