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-#
-# 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
-
-import sys
-
-from pyspark import SparkContext
-from pyspark.ml.classification import LogisticRegression
-from pyspark.mllib.evaluation import MulticlassMetrics
-from pyspark.ml.feature import StringIndexer
-from pyspark.sql import SQLContext
-
-"""
-A simple example demonstrating a logistic regression with elastic net regularization Pipeline.
-Run with:
- bin/spark-submit examples/src/main/python/ml/logistic_regression.py
-"""
-
-if __name__ == "__main__":
-
- if len(sys.argv) > 1:
- print("Usage: logistic_regression", file=sys.stderr)
- exit(-1)
-
- sc = SparkContext(appName="PythonLogisticRegressionExample")
- sqlContext = SQLContext(sc)
-
- # Load the data stored in LIBSVM format as a DataFrame.
- df = sqlContext.read.format("libsvm").load("data/mllib/sample_libsvm_data.txt")
-
- # Map labels into an indexed column of labels in [0, numLabels)
- stringIndexer = StringIndexer(inputCol="label", outputCol="indexedLabel")
- si_model = stringIndexer.fit(df)
- td = si_model.transform(df)
- [training, test] = td.randomSplit([0.7, 0.3])
-
- lr = LogisticRegression(maxIter=100, regParam=0.3).setLabelCol("indexedLabel")
- lr.setElasticNetParam(0.8)
-
- # Fit the model
- lrModel = lr.fit(training)
-
- predictionAndLabels = lrModel.transform(test).select("prediction", "indexedLabel") \
- .map(lambda x: (x.prediction, x.indexedLabel))
-
- metrics = MulticlassMetrics(predictionAndLabels)
- print("weighted f-measure %.3f" % metrics.weightedFMeasure())
- print("precision %s" % metrics.precision())
- print("recall %s" % metrics.recall())
-
- sc.stop()