| /* |
| * 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.hops.rewrite; |
| |
| import java.util.ArrayList; |
| |
| import org.apache.sysds.common.Types.OpOpData; |
| import org.apache.sysds.hops.DataOp; |
| import org.apache.sysds.hops.Hop; |
| |
| /** |
| * Rule: Eliminate for Transient Write DataHops to have no parents |
| * Solution: Move parent edges of Transient Write Hop to parent of |
| * its child |
| * Reason: Transient Write not being a root messes up |
| * analysis for Lop's to Instruction translation (according to Amol) |
| */ |
| public class RewriteTransientWriteParentHandling extends HopRewriteRule |
| { |
| @Override |
| public ArrayList<Hop> rewriteHopDAGs(ArrayList<Hop> roots, ProgramRewriteStatus state) { |
| for (Hop h : roots) |
| rule_RehangTransientWriteParents(h, roots); |
| return roots; |
| } |
| |
| @Override |
| public Hop rewriteHopDAG(Hop root, ProgramRewriteStatus state) { |
| // do nothing (does not apply to predicate hop DAGs) |
| return root; |
| } |
| |
| private void rule_RehangTransientWriteParents(Hop hop, ArrayList<Hop> sbHops) |
| { |
| if (hop instanceof DataOp && ((DataOp) hop).getOp() == OpOpData.TRANSIENTWRITE |
| && !hop.getParent().isEmpty()) { |
| |
| // update parents inputs with data op input |
| for (Hop p : hop.getParent()) { |
| p.getInput().set(p.getInput().indexOf(hop), hop.getInput().get(0)); |
| } |
| |
| // update dataop input parent to add new parents except for |
| // dataop itself |
| hop.getInput().get(0).getParent().addAll(hop.getParent()); |
| |
| // remove dataop parents |
| hop.getParent().clear(); |
| |
| // add dataop as root for this Hops DAG |
| sbHops.add(hop); |
| |
| // do the same thing for my inputs (children) |
| for (Hop hi : hop.getInput()) { |
| rule_RehangTransientWriteParents(hi,sbHops); |
| } |
| } |
| } |
| } |