| /* |
| * 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.compress.estim; |
| |
| import org.apache.sysds.runtime.compress.CompressionSettings; |
| import org.apache.sysds.runtime.compress.colgroup.indexes.IColIndex; |
| import org.apache.sysds.runtime.compress.estim.encoding.EmptyEncoding; |
| import org.apache.sysds.runtime.compress.estim.encoding.EncodingFactory; |
| import org.apache.sysds.runtime.compress.estim.encoding.IEncode; |
| import org.apache.sysds.runtime.matrix.data.MatrixBlock; |
| |
| /** |
| * Exact compressed size estimator (examines entire dataset). |
| */ |
| public class ComEstExact extends AComEst { |
| |
| public ComEstExact(MatrixBlock data, CompressionSettings compSettings) { |
| super(data, compSettings); |
| } |
| |
| @Override |
| public CompressedSizeInfoColGroup getColGroupInfo(IColIndex colIndexes, int estimate, int nrUniqueUpperBound) { |
| final IEncode map = EncodingFactory.createFromMatrixBlock(_data, _cs.transposed, colIndexes); |
| if(map instanceof EmptyEncoding) |
| return new CompressedSizeInfoColGroup(colIndexes, getNumRows()); |
| return getFacts(map, colIndexes); |
| } |
| |
| @Override |
| public CompressedSizeInfoColGroup getDeltaColGroupInfo(IColIndex colIndexes, int estimate, int nrUniqueUpperBound) { |
| final IEncode map = EncodingFactory.createFromMatrixBlockDelta(_data, _cs.transposed, colIndexes); |
| return getFacts(map, colIndexes); |
| } |
| |
| @Override |
| protected CompressedSizeInfoColGroup combine(IColIndex combinedColumns, CompressedSizeInfoColGroup g1, |
| CompressedSizeInfoColGroup g2, int maxDistinct) { |
| final IEncode map = g1.getMap().combine(g2.getMap()); |
| return getFacts(map, combinedColumns); |
| } |
| |
| protected CompressedSizeInfoColGroup getFacts(IEncode map, IColIndex colIndexes) { |
| final int _numRows = getNumRows(); |
| final EstimationFactors em = map.extractFacts(_numRows, _data.getSparsity(), _data.getSparsity(), _cs); |
| return new CompressedSizeInfoColGroup(colIndexes, em, _cs.validCompressions, map); |
| } |
| |
| @Override |
| protected int worstCaseUpperBound(IColIndex columns) { |
| return getNumRows(); |
| } |
| |
| } |