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Declarative Machine Learning
/*
* 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.sysml.hops.rewrite;
import java.util.ArrayList;
import org.apache.sysml.hops.DataOp;
import org.apache.sysml.hops.Hop;
import org.apache.sysml.hops.HopsException;
import org.apache.sysml.hops.Hop.DataOpTypes;
/**
* 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 rewriteHopDAGs(ArrayList roots, ProgramRewriteStatus state)
throws HopsException
{
for (Hop h : roots)
rule_RehangTransientWriteParents(h, roots);
return roots;
}
@Override
public Hop rewriteHopDAG(Hop root, ProgramRewriteStatus state)
throws HopsException
{
// do nothing (does not apply to predicate hop DAGs)
return root;
}
private void rule_RehangTransientWriteParents(Hop hop, ArrayList sbHops)
throws HopsException
{
if (hop instanceof DataOp && ((DataOp) hop).getDataOpType() == DataOpTypes.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);
}
}
}
}