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move ObjectiveSolutionPrinter to new SearchHelpers.cs CP-SAT C# code

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This commit is contained in:
Laurent Perron
2018-12-28 18:17:41 +01:00
parent affbc1e0c0
commit cf73e298a2
4 changed files with 121 additions and 96 deletions
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22
examples/dotnet/ShiftSchedulingSat.cs
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@@ -546,25 +546,3 @@ public class ShiftSchedulingSat
}
}
public class ObjectiveSolutionPrinter : CpSolverSolutionCallback
{
private DateTime _startTime;
private int _solutionCount;
public ObjectiveSolutionPrinter()
{
_startTime = DateTime.Now;
}
public override void OnSolutionCallback()
{
var currentTime = DateTime.Now;
var objective = ObjectiveValue();
var objectiveBound = BestObjectiveBound();
var time = currentTime - _startTime;
Console.WriteLine($"Solution {_solutionCount}, time = {time.TotalSeconds} s, objective = [{objectiveBound}, {objective}]");
_solutionCount++;
}
}

1
makefiles/Makefile.dotnet.mk
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@@ -327,6 +327,7 @@ $(DOTNET_ORTOOLS_NATIVE_NUPKG): \
$(SRC_DIR)/ortools/sat/csharp/CpSolver.cs \
$(SRC_DIR)/ortools/sat/csharp/IntegerExpressions.cs \
$(SRC_DIR)/ortools/sat/csharp/IntervalVariables.cs \
$(SRC_DIR)/ortools/sat/csharp/SearchHelpers.cs \
$(SRC_DIR)/ortools/util/csharp/NestedArrayHelper.cs \
$(SRC_DIR)/ortools/util/csharp/ProtoHelper.cs \
$(GEN_DIR)/ortools/constraint_solver/SearchLimit.pb.cs \

75
ortools/sat/csharp/CpSolver.cs
View File

@@ -15,80 +15,7 @@ using System;
using System.Collections.Generic;
namespace Google.OrTools.Sat
{
public class CpSolverSolutionCallback : SolutionCallback
{
public long Value(IntegerExpression e)
{
List<IntegerExpression> exprs = new List<IntegerExpression>();
List<long> coeffs = new List<long>();
exprs.Add(e);
coeffs.Add(1L);
long constant = 0;
while (exprs.Count > 0)
{
IntegerExpression expr = exprs[0];
exprs.RemoveAt(0);
long coeff = coeffs[0];
coeffs.RemoveAt(0);
if (coeff == 0) continue;
if (expr is ProductCst)
{
ProductCst p = (ProductCst)expr;
if (p.Coeff != 0)
{
exprs.Add(p.Expr);
coeffs.Add(p.Coeff * coeff);
}
}
else if (expr is SumArray)
{
SumArray a = (SumArray)expr;
constant += coeff * a.Constant;
foreach (IntegerExpression sub in a.Expressions)
{
exprs.Add(sub);
coeffs.Add(coeff);
}
}
else if (expr is IntVar)
{
int index = expr.Index;
long value = SolutionIntegerValue(index);
constant += coeff * value;
}
else if (expr is NotBooleanVariable)
{
throw new ArgumentException(
"Cannot evaluate a literal in an integer expression.");
}
else
{
throw new ArgumentException("Cannot evaluate '" + expr.ToString() +
"' in an integer expression");
}
}
return constant;
}
public Boolean BooleanValue(ILiteral literal)
{
if (literal is IntVar || literal is NotBooleanVariable)
{
int index = literal.GetIndex();
return SolutionBooleanValue(index);
}
else
{
throw new ArgumentException("Cannot evaluate '" + literal.ToString() +
"' as a boolean literal");
}
}
}
{
public class CpSolver
{

119
ortools/sat/csharp/SearchHelpers.cs Normal file
View File

@@ -0,0 +1,119 @@
// Copyright 2010-2018 Google LLC
// Licensed 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.
using System;
using System.Collections.Generic;
namespace Google.OrTools.Sat
{
public class CpSolverSolutionCallback : SolutionCallback
{
public long Value(IntegerExpression e)
{
List<IntegerExpression> exprs = new List<IntegerExpression>();
List<long> coeffs = new List<long>();
exprs.Add(e);
coeffs.Add(1L);
long constant = 0;
while (exprs.Count > 0)
{
IntegerExpression expr = exprs[0];
exprs.RemoveAt(0);
long coeff = coeffs[0];
coeffs.RemoveAt(0);
if (coeff == 0) continue;
if (expr is ProductCst)
{
ProductCst p = (ProductCst)expr;
if (p.Coeff != 0)
{
exprs.Add(p.Expr);
coeffs.Add(p.Coeff * coeff);
}
}
else if (expr is SumArray)
{
SumArray a = (SumArray)expr;
constant += coeff * a.Constant;
foreach (IntegerExpression sub in a.Expressions)
{
exprs.Add(sub);
coeffs.Add(coeff);
}
}
else if (expr is IntVar)
{
int index = expr.Index;
long value = SolutionIntegerValue(index);
constant += coeff * value;
}
else if (expr is NotBooleanVariable)
{
throw new ArgumentException(
"Cannot evaluate a literal in an integer expression.");
}
else
{
throw new ArgumentException("Cannot evaluate '" + expr.ToString() +
"' in an integer expression");
}
}
return constant;
}
public Boolean BooleanValue(ILiteral literal)
{
if (literal is IntVar || literal is NotBooleanVariable)
{
int index = literal.GetIndex();
return SolutionBooleanValue(index);
}
else
{
throw new ArgumentException("Cannot evaluate '" + literal.ToString() +
"' as a boolean literal");
}
}
}
public class ObjectiveSolutionPrinter : CpSolverSolutionCallback
{
private DateTime _startTime;
private int _solutionCount;
public ObjectiveSolutionPrinter()
{
_startTime = DateTime.Now;
}
public override void OnSolutionCallback()
{
var currentTime = DateTime.Now;
var objective = ObjectiveValue();
var objectiveBound = BestObjectiveBound();
var objLb = Math.Min(objective, objectiveBound);
var objUb = Math.Max(objective, objectiveBound);
var time = currentTime - _startTime;
Console.WriteLine(value: $"Solution {_solutionCount}, time = {time.TotalSeconds} s, objective = [{objLb}, {objUb}]");
_solutionCount++;
}
public int solutionCount() => _solutionCount;
}
} // namespace Google.OrTools.Sat