| # |
| # 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. |
| # |
| |
| """ |
| An example for Chi-square hypothesis testing. |
| Run with: |
| bin/spark-submit examples/src/main/python/ml/chi_square_test_example.py |
| """ |
| from pyspark.sql import SparkSession |
| # $example on$ |
| from pyspark.ml.linalg import Vectors |
| from pyspark.ml.stat import ChiSquareTest |
| # $example off$ |
| |
| if __name__ == "__main__": |
| spark = SparkSession \ |
| .builder \ |
| .appName("ChiSquareTestExample") \ |
| .getOrCreate() |
| |
| # $example on$ |
| data = [(0.0, Vectors.dense(0.5, 10.0)), |
| (0.0, Vectors.dense(1.5, 20.0)), |
| (1.0, Vectors.dense(1.5, 30.0)), |
| (0.0, Vectors.dense(3.5, 30.0)), |
| (0.0, Vectors.dense(3.5, 40.0)), |
| (1.0, Vectors.dense(3.5, 40.0))] |
| df = spark.createDataFrame(data, ["label", "features"]) |
| |
| r = ChiSquareTest.test(df, "features", "label").head() |
| print("pValues: " + str(r.pValues)) |
| print("degreesOfFreedom: " + str(r.degreesOfFreedom)) |
| print("statistics: " + str(r.statistics)) |
| # $example off$ |
| |
| spark.stop() |