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0001 # 0002 # Licensed to the Apache Software Foundation (ASF) under one or more 0003 # contributor license agreements. See the NOTICE file distributed with 0004 # this work for additional information regarding copyright ownership. 0005 # The ASF licenses this file to You under the Apache License, Version 2.0 0006 # (the "License"); you may not use this file except in compliance with 0007 # the License. You may obtain a copy of the License at 0008 # 0009 # http://www.apache.org/licenses/LICENSE-2.0 0010 # 0011 # Unless required by applicable law or agreed to in writing, software 0012 # distributed under the License is distributed on an "AS IS" BASIS, 0013 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 0014 # See the License for the specific language governing permissions and 0015 # limitations under the License. 0016 # 0017 0018 from pyspark import SparkContext 0019 # $example on$ 0020 from pyspark.mllib.linalg import Vectors 0021 from pyspark.mllib.linalg.distributed import RowMatrix 0022 # $example off$ 0023 0024 if __name__ == "__main__": 0025 sc = SparkContext(appName="PythonPCAOnRowMatrixExample") 0026 0027 # $example on$ 0028 rows = sc.parallelize([ 0029 Vectors.sparse(5, {1: 1.0, 3: 7.0}), 0030 Vectors.dense(2.0, 0.0, 3.0, 4.0, 5.0), 0031 Vectors.dense(4.0, 0.0, 0.0, 6.0, 7.0) 0032 ]) 0033 0034 mat = RowMatrix(rows) 0035 # Compute the top 4 principal components. 0036 # Principal components are stored in a local dense matrix. 0037 pc = mat.computePrincipalComponents(4) 0038 0039 # Project the rows to the linear space spanned by the top 4 principal components. 0040 projected = mat.multiply(pc) 0041 # $example off$ 0042 collected = projected.rows.collect() 0043 print("Projected Row Matrix of principal component:") 0044 for vector in collected: 0045 print(vector) 0046 sc.stop()
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