#===============================================================================
# Copyright 2014-2021 Intel Corporation
#
# Licensed 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
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#===============================================================================

# daal4py QR example for shared memory systems

import daal4py as d4p

# let's use a generator for getting stream from file (defined in stream.py)
from stream import read_next


def main(readcsv=None, method='svdDense'):
    infile = "./data/batch/qr.csv"

    # configure a QR object
    algo = d4p.qr(streaming=True)

    # get the generator (defined in stream.py)...
    rn = read_next(infile, 112, readcsv)
    # ... and iterate through chunks/stream
    for chunk in rn:
        algo.compute(chunk)

    # finalize computation
    result = algo.finalize()

    # QR result objects provide matrixQ and matrixR
    return result


if __name__ == "__main__":
    result = main()
    print("Orthogonal matrix Q:\n", result.matrixQ[:10])
    print("Triangular matrix R:\n", result.matrixR)
    print('All looks good!')