| /* |
| * 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.colgroup; |
| |
| import org.apache.sysds.runtime.compress.colgroup.dictionary.ADictionary; |
| import org.apache.sysds.runtime.compress.colgroup.indexes.IColIndex; |
| import org.apache.sysds.runtime.compress.colgroup.offset.AOffset; |
| import org.apache.sysds.runtime.compress.estim.CompressedSizeInfoColGroup; |
| import org.apache.sysds.runtime.compress.estim.EstimationFactors; |
| |
| /** |
| * Column group that sparsely encodes the dictionary values. The idea is that all values is encoded with indexes except |
| * the most common one. the most common one can be inferred by not being included in the indexes. |
| * |
| * This column group is handy in cases where sparse unsafe operations is executed on very sparse columns. Then the zeros |
| * would be materialized in the group without any overhead. |
| */ |
| public abstract class ASDC extends AMorphingMMColGroup implements AOffsetsGroup , IContainDefaultTuple { |
| private static final long serialVersionUID = 769993538831949086L; |
| |
| /** Sparse row indexes for the data */ |
| protected final AOffset _indexes; |
| /** The number of rows in this column group */ |
| protected final int _numRows; |
| |
| protected ASDC(IColIndex colIndices, int numRows, ADictionary dict, AOffset offsets, int[] cachedCounts) { |
| super(colIndices, dict, cachedCounts); |
| _indexes = offsets; |
| _numRows = numRows; |
| } |
| |
| public int getNumRows() { |
| return _numRows; |
| } |
| |
| @Override |
| public AOffset getOffsets() { |
| return _indexes; |
| } |
| |
| public abstract int getNumberOffsets(); |
| |
| @Override |
| public final CompressedSizeInfoColGroup getCompressionInfo(int nRow) { |
| EstimationFactors ef = new EstimationFactors(getNumValues(), _numRows, getNumberOffsets(), _dict.getSparsity()); |
| return new CompressedSizeInfoColGroup(_colIndexes, ef, nRow, getCompType(),getEncoding()); |
| } |
| } |