Python* API Reference for Intel® Data Analytics Acceleration Library 2019 Update 5

pca_svd_dense_distr.py

Deprecation Notice: With the introduction of daal4py, a package that supersedes PyDAAL, Intel is deprecating PyDAAL and will discontinue support starting with Intel® DAAL 2021 and Intel® Distribution for Python 2021. Until then Intel will continue to provide compatible pyDAAL pip and conda packages for newer releases of Intel DAAL and make it available in open source. However, Intel will not add the new features of Intel DAAL to pyDAAL. Intel recommends developers switch to and use daal4py.

Note: To find daal4py examples, refer to daal4py documentation or browse github repository.

1 # file: pca_svd_dense_distr.py
2 #===============================================================================
3 # Copyright 2014-2019 Intel Corporation.
4 #
5 # This software and the related documents are Intel copyrighted materials, and
6 # your use of them is governed by the express license under which they were
7 # provided to you (License). Unless the License provides otherwise, you may not
8 # use, modify, copy, publish, distribute, disclose or transmit this software or
9 # the related documents without Intel's prior written permission.
10 #
11 # This software and the related documents are provided as is, with no express
12 # or implied warranties, other than those that are expressly stated in the
13 # License.
14 #===============================================================================
15 
16 ## <a name="DAAL-EXAMPLE-PY-PCA_SVD_DENSE_DISTRIBUTED"></a>
17 ## \example pca_svd_dense_distr.py
18 
19 import os
20 import sys
21 
22 import daal
23 from daal.algorithms import pca
24 from daal.data_management import FileDataSource, DataSourceIface
25 
26 utils_folder = os.path.realpath(os.path.abspath(os.path.dirname(os.path.dirname(__file__))))
27 if utils_folder not in sys.path:
28  sys.path.insert(0, utils_folder)
29 from utils import printNumericTable
30 
31 DAAL_PREFIX = os.path.join('..', 'data')
32 
33 # Input data set parameters
34 nBlocks = 4
35 nVectorsInBlock = 250
36 
37 dataFileNames = [
38  os.path.join(DAAL_PREFIX, 'distributed', 'pca_normalized_1.csv'),
39  os.path.join(DAAL_PREFIX, 'distributed', 'pca_normalized_2.csv'),
40  os.path.join(DAAL_PREFIX, 'distributed', 'pca_normalized_3.csv'),
41  os.path.join(DAAL_PREFIX, 'distributed', 'pca_normalized_4.csv')
42 ]
43 
44 if __name__ == "__main__":
45 
46  # Create an algorithm for principal component analysis using the SVD method on the master node
47  masterAlgorithm = pca.Distributed(step=daal.step2Master, method=pca.svdDense)
48 
49  for i in range(nBlocks):
50  # Initialize FileDataSource<CSVFeatureManager> to retrieve the input data from a .csv file
51  dataSource = FileDataSource(
52  dataFileNames[i], DataSourceIface.doAllocateNumericTable,
53  DataSourceIface.doDictionaryFromContext
54  )
55 
56  # Retrieve the input data
57  dataSource.loadDataBlock(nVectorsInBlock)
58 
59  # Create an algorithm for principal component analysis using the SVD method on the local node
60  localAlgorithm = pca.Distributed(step=daal.step1Local, method=pca.svdDense)
61 
62  # Set the input data to the algorithm
63  localAlgorithm.input.setDataset(pca.data, dataSource.getNumericTable())
64 
65  # Compute PCA decomposition
66  # Set local partial results as input for the master-node algorithm
67  masterAlgorithm.input.add(pca.partialResults, localAlgorithm.compute())
68 
69  # Merge and finalize PCA decomposition on the master node
70  masterAlgorithm.compute()
71  result = masterAlgorithm.finalizeCompute()
72 
73  # Print the results
74  printNumericTable(result.get(pca.eigenvalues), "Eigenvalues:")
75  printNumericTable(result.get(pca.eigenvectors), "Eigenvectors:")

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