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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.globalopt;
import java.util.HashMap;
import java.util.Map.Entry;
import org.apache.sysml.hops.globalopt.gdfgraph.GDFNode;
/**
* This MemoStructure is the central location for storing enumerated plans (configurations) and serves
* two purposes:
*
* 1) Plan Memoization: Due to the DAG structure (where a single node is reachable over alternative
* paths), our top-down, recursive optimization procedure might visit an operator multiple times.
* The memo structure memoizes and reuses already generated plans.
*
* 2) config set cache
*
* The internal structure is as follows:
* Memo Structure := | LONG GDFNodeID | MemoEntry | *
* Memo Entry := | InterestingPropertySet | DOUBLE COST | *
*
*/
public class MemoStructure
{
private HashMap _entries = null; //NODEID | PLANSET
private HashMap _nodeIDs = null; //NODEID | HOPID
public MemoStructure()
{
_entries = new HashMap();
_nodeIDs = new HashMap();
}
///////////////////////////////////////////////////
// basic access to memo structure entries
public boolean constainsEntry( GDFNode node )
{
return _entries.containsKey( node.getID() );
}
public void putEntry( GDFNode node, PlanSet entry )
{
_entries.put( node.getID(), entry );
if( node.getHop()!=null )
_nodeIDs.put( node.getID(), node.getHop().getHopID() );
else
_nodeIDs.put( node.getID(), -1L );
}
public PlanSet getEntry( GDFNode node )
{
return _entries.get( node.getID()) ;
}
@Override
public String toString()
{
StringBuilder sb = new StringBuilder();
sb.append("------------------------------------\n");
sb.append("MEMO STRUCTURE (gdfnodeid, plans): \n");
sb.append("------------------------------------\n");
for( Entry e : _entries.entrySet() )
{
sb.append("------------------------------------\n");
sb.append("Node "+e.getKey()+" (hop "+_nodeIDs.get(e.getKey())+"):\n");
for( Plan p : e.getValue().getPlans() ) {
sb.append(p.toString());
sb.append("\n");
}
}
return sb.toString();
}
}