Baunsgaard commented on code in PR #1983: URL: https://github.com/apache/systemds/pull/1983#discussion_r1492390108
########## src/main/java/org/apache/sysds/runtime/matrix/data/LibMatrixFourier.java: ########## @@ -0,0 +1,309 @@ +/* + * 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. + */ + +package org.apache.sysds.runtime.matrix.data; + +import org.apache.commons.math3.util.FastMath; + +public class LibMatrixFourier { + + /** + * Function to perform FFT for two given matrices. The first one represents the real values and the second one the + * imaginary values. The output also contains one matrix for the real and one for the imaginary values. + * + * @param re matrix object representing the real values + * @param im matrix object representing the imaginary values + * @return array of two matrix blocks + */ + public static MatrixBlock[] fft(MatrixBlock re, MatrixBlock im) { + + int rows = re.getNumRows(); + int cols = re.getNumColumns(); + if(!isPowerOfTwo(rows) || !isPowerOfTwo(cols)) + throw new RuntimeException("false dimensions"); + + fft(re.getDenseBlockValues(), im.getDenseBlockValues(), rows, cols, true); + + return new MatrixBlock[] {re, im}; + } + + /** + * Function to perform IFFT for two given matrices. The first one represents the real values and the second one the + * imaginary values. The output also contains one matrix for the real and one for the imaginary values. + * + * @param re matrix object representing the real values + * @param im matrix object representing the imaginary values + * @return array of two matrix blocks + */ + public static MatrixBlock[] ifft(MatrixBlock re, MatrixBlock im) { + + int rows = re.getNumRows(); + int cols = re.getNumColumns(); + if(!isPowerOfTwo(rows) || !isPowerOfTwo(cols)) + throw new RuntimeException("false dimensions"); + + ifft(re.getDenseBlockValues(), im.getDenseBlockValues(), rows, cols, true); + + return new MatrixBlock[] {re, im}; + } + + /** + * Function to perform FFT for each row of two given matrices. The first one represents the real values and the + * second one the imaginary values. The output also contains one matrix for the real and one for the imaginary + * values. + * + * @param re matrix object representing the real values + * @param im matrix object representing the imaginary values + * @return array of two matrix blocks + */ + public static MatrixBlock[] fft_linearized(MatrixBlock re, MatrixBlock im) { + + int rows = re.getNumRows(); + int cols = re.getNumColumns(); + if(!isPowerOfTwo(cols)) + throw new RuntimeException("false dimensions"); + + fft(re.getDenseBlockValues(), im.getDenseBlockValues(), rows, cols, false); + + return new MatrixBlock[] {re, im}; + } + + /** + * Function to perform IFFT for each row of two given matrices. The first one represents the real values and the + * second one the imaginary values. The output also contains one matrix for the real and one for the imaginary + * values. + * + * @param re matrix object representing the real values + * @param im matrix object representing the imaginary values + * @return array of two matrix blocks + */ + public static MatrixBlock[] ifft_linearized(MatrixBlock re, MatrixBlock im) { + + int rows = re.getNumRows(); + int cols = re.getNumColumns(); + if(!isPowerOfTwo(cols)) + throw new RuntimeException("false dimensions"); + + ifft(re.getDenseBlockValues(), im.getDenseBlockValues(), rows, cols, false); + + return new MatrixBlock[] {re, im}; + } + + /** + * Function to perform FFT for two given double arrays. The first one represents the real values and the second one + * the imaginary values. Both arrays get updated and contain the result. + * + * @param re array representing the real values + * @param im array representing the imaginary values + * @param rows number of rows + * @param cols number of rows + * @param inclColCalc if true, fft is also calculated for each column, otherwise only for each row + */ + public static void fft(double[] re, double[] im, int rows, int cols, boolean inclColCalc) { + + double[] re_inter = new double[rows * cols]; + double[] im_inter = new double[rows * cols]; + + for(int i = 0; i < rows; i++) { + fft_one_dim(re, im, re_inter, im_inter, i * cols, (i + 1) * cols, cols, 1); + } + + if(inclColCalc) { + for(int j = 0; j < cols; j++) { + fft_one_dim(re, im, re_inter, im_inter, j, j + rows * cols, rows, cols); + } + } + + } + + /** + * Function to perform IFFT for two given double arrays. The first one represents the real values and the second one + * the imaginary values. Both arrays get updated and contain the result. + * + * @param re array representing the real values + * @param im array representing the imaginary values + * @param rows number of rows + * @param cols number of rows + * @param inclColCalc if true, fft is also calculated for each column, otherwise only for each row + */ + public static void ifft(double[] re, double[] im, int rows, int cols, boolean inclColCalc) { + + double[] re_inter = new double[rows * cols]; + double[] im_inter = new double[rows * cols]; + + if(inclColCalc) { + for(int j = 0; j < cols; j++) { + ifft_one_dim(re, im, re_inter, im_inter, j, j + rows * cols, rows, cols); + } + } + + for(int i = 0; i < rows; i++) { + ifft_one_dim(re, im, re_inter, im_inter, i * cols, (i + 1) * cols, cols, 1); Review Comment: full example of parallel execution: https://github.com/apache/systemds/blob/f4b7a47cbba9951210eef45263dc4a927b59225c/src/main/java/org/apache/sysds/runtime/frame/data/lib/FrameLibDetectSchema.java#L84 -- This is an automated message from the Apache Git Service. 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