python/pyspark/ml/tests/test_util.py

#
# 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
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#

import unittest

from pyspark.ml import Pipeline
from pyspark.ml.classification import LogisticRegression, OneVsRest
from pyspark.ml.feature import VectorAssembler
from pyspark.ml.linalg import Vectors
from pyspark.ml.util import MetaAlgorithmReadWrite
from pyspark.testing.mlutils import SparkSessionTestCase


class MetaAlgorithmReadWriteTests(SparkSessionTestCase):
    def test_getAllNestedStages(self):
        def _check_uid_set_equal(stages, expected_stages):
            uids = set(map(lambda x: x.uid, stages))
            expected_uids = set(map(lambda x: x.uid, expected_stages))
            self.assertEqual(uids, expected_uids)

        df1 = self.spark.createDataFrame(
            [
                (Vectors.dense([1.0, 2.0]), 1.0),
                (Vectors.dense([-1.0, -2.0]), 0.0),
            ],
            ["features", "label"],
        )
        df2 = self.spark.createDataFrame(
            [
                (1.0, 2.0, 1.0),
                (1.0, 2.0, 0.0),
            ],
            ["a", "b", "label"],
        )
        vs = VectorAssembler(inputCols=["a", "b"], outputCol="features")
        lr = LogisticRegression()
        pipeline = Pipeline(stages=[vs, lr])
        pipelineModel = pipeline.fit(df2)
        ova = OneVsRest(classifier=lr)
        ovaModel = ova.fit(df1)

        ova_pipeline = Pipeline(stages=[vs, ova])
        nested_pipeline = Pipeline(stages=[ova_pipeline])

        _check_uid_set_equal(
            MetaAlgorithmReadWrite.getAllNestedStages(pipeline), [pipeline, vs, lr]
        )
        _check_uid_set_equal(
            MetaAlgorithmReadWrite.getAllNestedStages(pipelineModel),
            [pipelineModel] + pipelineModel.stages,
        )
        _check_uid_set_equal(MetaAlgorithmReadWrite.getAllNestedStages(ova), [ova, lr])
        _check_uid_set_equal(
            MetaAlgorithmReadWrite.getAllNestedStages(ovaModel), [ovaModel, lr] + ovaModel.models
        )
        _check_uid_set_equal(
            MetaAlgorithmReadWrite.getAllNestedStages(nested_pipeline),
            [nested_pipeline, ova_pipeline, vs, ova, lr],
        )


if __name__ == "__main__":
    from pyspark.ml.tests.test_util import *  # noqa: F401

    try:
        import xmlrunner

        testRunner = xmlrunner.XMLTestRunner(output="target/test-reports", verbosity=2)
    except ImportError:
        testRunner = None
    unittest.main(testRunner=testRunner, verbosity=2)