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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.
+#
+
+"""
+Pipeline Example.
+"""
+from pyspark import SparkContext, SQLContext
+# $example on$
+from pyspark.ml import Pipeline
+from pyspark.ml.classification import LogisticRegression
+from pyspark.ml.feature import HashingTF, Tokenizer
+# $example off$
+
+if __name__ == "__main__":
+
+ sc = SparkContext(appName="PipelineExample")
+ sqlContext = SQLContext(sc)
+
+ # $example on$
+ # Prepare training documents from a list of (id, text, label) tuples.
+ training = sqlContext.createDataFrame([
+ (0L, "a b c d e spark", 1.0),
+ (1L, "b d", 0.0),
+ (2L, "spark f g h", 1.0),
+ (3L, "hadoop mapreduce", 0.0)], ["id", "text", "label"])
+
+ # Configure an ML pipeline, which consists of three stages: tokenizer, hashingTF, and lr.
+ tokenizer = Tokenizer(inputCol="text", outputCol="words")
+ hashingTF = HashingTF(inputCol=tokenizer.getOutputCol(), outputCol="features")
+ lr = LogisticRegression(maxIter=10, regParam=0.01)
+ pipeline = Pipeline(stages=[tokenizer, hashingTF, lr])
+
+ # Fit the pipeline to training documents.
+ model = pipeline.fit(training)
+
+ # Prepare test documents, which are unlabeled (id, text) tuples.
+ test = sqlContext.createDataFrame([
+ (4L, "spark i j k"),
+ (5L, "l m n"),
+ (6L, "mapreduce spark"),
+ (7L, "apache hadoop")], ["id", "text"])
+
+ # Make predictions on test documents and print columns of interest.
+ prediction = model.transform(test)
+ selected = prediction.select("id", "text", "prediction")
+ for row in selected.collect():
+ print(row)
+ # $example off$
+
+ sc.stop()