| /* |
| * 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.operators; |
| |
| import org.apache.sysds.runtime.functionobjects.And; |
| import org.apache.sysds.runtime.functionobjects.BitwShiftL; |
| import org.apache.sysds.runtime.functionobjects.BitwShiftR; |
| import org.apache.sysds.runtime.functionobjects.Builtin; |
| import org.apache.sysds.runtime.functionobjects.Builtin.BuiltinCode; |
| import org.apache.sysds.runtime.functionobjects.Equals; |
| import org.apache.sysds.runtime.functionobjects.Minus; |
| import org.apache.sysds.runtime.functionobjects.MinusNz; |
| import org.apache.sysds.runtime.functionobjects.Multiply; |
| import org.apache.sysds.runtime.functionobjects.Multiply2; |
| import org.apache.sysds.runtime.functionobjects.NotEquals; |
| import org.apache.sysds.runtime.functionobjects.Power2; |
| import org.apache.sysds.runtime.functionobjects.ValueFunction; |
| |
| |
| /** |
| * Base class for all scalar operators. |
| * |
| */ |
| public abstract class ScalarOperator extends Operator |
| { |
| private static final long serialVersionUID = 4547253761093455869L; |
| |
| public final ValueFunction fn; |
| protected final double _constant; |
| |
| public ScalarOperator(ValueFunction p, double cst) { |
| this(p, cst, false); |
| } |
| |
| protected ScalarOperator(ValueFunction p, double cst, boolean altSparseSafe) { |
| super( isSparseSafeStatic(p) || altSparseSafe |
| || (p instanceof NotEquals && cst==0) |
| || (p instanceof Equals && cst!=0) |
| || (p instanceof Minus && cst==0) |
| || (p instanceof Builtin && ((Builtin)p).getBuiltinCode()==BuiltinCode.MAX && cst<=0) |
| || (p instanceof Builtin && ((Builtin)p).getBuiltinCode()==BuiltinCode.MIN && cst>=0)); |
| fn = p; |
| _constant = cst; |
| } |
| |
| public double getConstant() { |
| return _constant; |
| } |
| |
| public abstract ScalarOperator setConstant(double cst); |
| |
| /** |
| * Apply the scalar operator over a given input value. |
| * |
| * @param in input value |
| * @return result |
| */ |
| public abstract double executeScalar(double in); |
| |
| /** |
| * Indicates if the function is statically sparse safe, i.e., it is always |
| * sparse safe independent of the given constant. |
| * @param fn ValueFunction object |
| * @return true if function statically sparse safe |
| */ |
| protected static boolean isSparseSafeStatic(ValueFunction fn) { |
| return ( fn instanceof Multiply || fn instanceof Multiply2 |
| || fn instanceof Power2 || fn instanceof And || fn instanceof MinusNz |
| || fn instanceof Builtin && ((Builtin)fn).getBuiltinCode()==BuiltinCode.LOG_NZ) |
| || fn instanceof BitwShiftL || fn instanceof BitwShiftR; |
| } |
| } |