Changeset 13288


Ignore:
Timestamp:
11/19/15 12:02:20 (4 years ago)
Author:
bburlacu
Message:

#2442: Removed time lagged symbols as they bring extra complexity in evaluating variables and a big performance penalty. Fixed interpretation of Psi, Power, Root, Square symbols.

File:
1 edited

Legend:

Unmodified
Added
Removed

  • trunk/sources/HeuristicLab.Problems.DataAnalysis.Symbolic/3.4/Interpreter/SymbolicDataAnalysisExpressionCompiledTreeInterpreter.cs

    r13251 r13288  
    4646    private static readonly MethodInfo Sqrt = typeof(Math).GetMethod("Sqrt", new[] { typeof(double) });
    4747    private static readonly MethodInfo Floor = typeof(Math).GetMethod("Floor", new[] { typeof(double) });
     48    private static readonly MethodInfo Round = typeof(Math).GetMethod("Round", new[] { typeof(double) });
    4849    private static readonly MethodInfo Exp = typeof(Math).GetMethod("Exp", new[] { typeof(double) });
    4950    private static readonly MethodInfo Log = typeof(Math).GetMethod("Log", new[] { typeof(double) });
    5051    private static readonly MethodInfo IsNaN = typeof(double).GetMethod("IsNaN");
     52    private static readonly MethodInfo IsAlmost = typeof(DoubleExtensions).GetMethod("IsAlmost");
    5153    private static readonly MethodInfo Gamma = typeof(alglib).GetMethod("gammafunction", new[] { typeof(double) });
    5254    private static readonly MethodInfo Psi = typeof(alglib).GetMethod("psi", new[] { typeof(double) });
    … …  
    159161            var indexExpr = Expression.Constant(variableIndices[variableName]);
    160162            var valuesExpr = Expression.ArrayIndex(columns, indexExpr);
    161             var variableValue = Expression.Property(valuesExpr, Indexer, row);
    162             return Expression.Multiply(variableWeight, variableValue);
     163            return Expression.Multiply(variableWeight, Expression.Property(valuesExpr, Indexer, row));
    163164          }
    164165        case OpCodes.Add: {
    … …  
    215216        case OpCodes.Square: {
    216217            var arg = MakeExpr(node.GetSubtree(0), variableIndices, row, columns);
    217             return Expression.Power(arg, Expression.Constant(2));
     218            return Expression.Power(arg, Expression.Constant(2.0));
    218219          }
    219220        case OpCodes.Power: {
    220221            var arg = MakeExpr(node.GetSubtree(0), variableIndices, row, columns);
    221222            var power = MakeExpr(node.GetSubtree(1), variableIndices, row, columns);
    222             return Expression.Power(arg, Expression.Call(Floor, power));
     223            return Expression.Power(arg, Expression.Call(Round, power));
    223224          }
    224225        case OpCodes.SquareRoot: {
    … …  
    229230            var arg = MakeExpr(node.GetSubtree(0), variableIndices, row, columns);
    230231            var power = MakeExpr(node.GetSubtree(1), variableIndices, row, columns);
    231             return Expression.Power(arg, Expression.Divide(Expression.Constant(1.0), power));
     232            return Expression.Power(arg, Expression.Divide(Expression.Constant(1.0), Expression.Call(Round, power)));
    232233          }
    233234        case OpCodes.Exp: {
    … …  
    269270                Expression.Assign(result, Expression.Constant(double.NaN)),
    270271                Expression.IfThenElse(
    271                   Expression.AndAlso(Expression.LessThanOrEqual(arg, Expression.Constant(0.0)),
    272                     Expression.Equal(Expression.Subtract(floor, arg), Expression.Constant(0.0))),
     272                  Expression.AndAlso(
     273                    Expression.LessThanOrEqual(arg, Expression.Constant(0.0)),
     274                    Expression.Call(IsAlmost, Expression.Subtract(floor, arg), Expression.Constant(0.0))),
    273275                  Expression.Assign(result, Expression.Constant(double.NaN)),
    274276                  Expression.Assign(result, psi))
    … …  
    297299            var arg = MakeExpr(node.GetSubtree(0), variableIndices, row, columns);
    298300            var isNaN = Expression.Call(IsNaN, arg);
    299             var expIntegrapEi =
    300               Expression.Call(ExponentialIntegralEi, arg);
     301            var expIntegrapEi = Expression.Call(ExponentialIntegralEi, arg);
    301302            var result = Expression.Variable(typeof(double));
    302303            var expr = Expression.Block(
    … …  
    357358            var shi = Expression.Variable(typeof(double));
    358359            var chi = Expression.Variable(typeof(double));
    359             var hypSinCosIntegrals = Expression.Call(HyperbolicSineCosineIntegrals, arg, shi, chi);
    360360            var block = Expression.Block(
    361361              new[] { shi, chi },
    362               hypSinCosIntegrals,
     362              Expression.Call(HyperbolicSineCosineIntegrals, arg, shi, chi),
    363363              shi
    364364              );
    … …  
    378378            var shi = Expression.Variable(typeof(double));
    379379            var chi = Expression.Variable(typeof(double));
    380             var hypSinCosIntegrals = Expression.Call(HyperbolicSineCosineIntegrals, arg, shi, chi);
    381380            var block = Expression.Block(
    382381              new[] { shi, chi },
    383               hypSinCosIntegrals,
     382              Expression.Call(HyperbolicSineCosineIntegrals, arg, shi, chi),
    384383              chi
    385384              );
    … …  
    470469            var isNaN = Expression.Call(IsNaN, arg);
    471470            var result = Expression.Variable(typeof(double));
    472             var norm = Expression.Call(NormalDistribution, arg);
    473 
    474             var expr = Expression.Block(new[] { result },
    475               Expression.IfThenElse(isNaN, Expression.Assign(result, Expression.Constant(double.NaN)),
    476                 Expression.Assign(result, norm)), result);
    477 
    478             return expr;
     471            return Expression.Block(
     472              new[] { result },
     473              Expression.IfThenElse(
     474                isNaN,
     475                Expression.Assign(result, Expression.Constant(double.NaN)),
     476                Expression.Assign(result, Expression.Call(NormalDistribution, arg))),
     477              result);
    479478          }
    480479        case OpCodes.Erf: {
    … …  
    482481            var isNaN = Expression.Call(IsNaN, arg);
    483482            var result = Expression.Variable(typeof(double));
    484             var erf = Expression.Call(ErrorFunction, arg);
    485 
    486             var expr = Expression.Block(new[] { result },
    487               Expression.IfThenElse(isNaN, Expression.Assign(result, Expression.Constant(double.NaN)),
    488                 Expression.Assign(result, erf)), result);
    489 
    490             return expr;
     483            return Expression.Block(
     484              new[] { result },
     485              Expression.IfThenElse(
     486                isNaN,
     487                Expression.Assign(result, Expression.Constant(double.NaN)),
     488                Expression.Assign(result, Expression.Call(ErrorFunction, arg))),
     489              result);
    491490          }
    492491        case OpCodes.Bessel: {
    … …  
    494493            var isNaN = Expression.Call(IsNaN, arg);
    495494            var result = Expression.Variable(typeof(double));
    496             var bessel = Expression.Call(Bessel, arg);
    497             var expr = Expression.Block(
     495            return Expression.Block(
    498496              new[] { result },
    499497              Expression.IfThenElse(
    500498                isNaN,
    501499                Expression.Assign(result, Expression.Constant(double.NaN)),
    502                 Expression.Assign(result, bessel)),
     500                Expression.Assign(result, Expression.Call(Bessel, arg))),
    503501              result);
    504 
    505             return expr;
    506502          }
    507503        case OpCodes.IfThenElse: {
    … …  
    628624            var indexExpr = Expression.Constant(variableIndices[variableName]);
    629625            var valuesExpr = Expression.ArrayIndex(columns, indexExpr);
    630             var variableValue = Expression.ArrayIndex(valuesExpr, row);
     626            var variableValue = Expression.Property(valuesExpr, Indexer, row);
    631627            var variableThreshold = Expression.Constant(variableConditionTreeNode.Threshold);
    632628            var variableSlope = Expression.Constant(variableConditionTreeNode.Slope);
    … …  
    643639              );
    644640          }
    645         case OpCodes.LagVariable: {
    646             var laggedVariableTreeNode = (LaggedVariableTreeNode)node;
    647             var lag = Expression.Constant(laggedVariableTreeNode.Lag);
    648             var variableWeight = Expression.Constant(laggedVariableTreeNode.Weight);
    649             var variableName = laggedVariableTreeNode.VariableName;
    650             var indexExpr = Expression.Constant(variableIndices[variableName]);
    651             var valuesExpr = Expression.ArrayIndex(columns, indexExpr);
    652             var variableValue = Expression.Property(valuesExpr, Indexer, Expression.Add(row, lag));
    653             return Expression.Multiply(variableWeight, variableValue);
    654           }
    655         case OpCodes.TimeLag: {
    656             var timeLagTreeNode = (LaggedTreeNode)node;
    657             var lag = Expression.Constant(timeLagTreeNode.Lag);
    658             return MakeExpr(timeLagTreeNode.GetSubtree(0), variableIndices, Expression.Add(row, lag), columns);
    659           }
    660         case OpCodes.Integral: {
    661             var timeLagTreeNode = (LaggedTreeNode)node;
    662             var subtree = node.GetSubtree(0);
    663             var sum = MakeExpr(subtree, variableIndices, row, columns);
    664             var sign = Expression.Constant(Math.Sign(timeLagTreeNode.Lag));
    665             var lag = Expression.Add(row, sign);
    666             for (int i = 0; i < Math.Abs(timeLagTreeNode.Lag); ++i) {
    667               sum = Expression.Add(sum, MakeExpr(subtree, variableIndices, lag, columns));
    668               lag = Expression.Add(lag, sign);
    669             }
    670             return sum;
    671           }
    672         case OpCodes.Derivative: {
    673             var subtree = node.GetSubtree(0);
    674             var f0 = MakeExpr(subtree, variableIndices, row, columns);
    675             var f1 = MakeExpr(subtree, variableIndices, Expression.Subtract(row, Expression.Constant(1)), columns);
    676             var f3 = MakeExpr(subtree, variableIndices, Expression.Subtract(row, Expression.Constant(3)), columns);
    677             var f4 = MakeExpr(subtree, variableIndices, Expression.Subtract(row, Expression.Constant(4)), columns);
    678 
    679             var result = f0;
    680             result = Expression.Add(result, Expression.Multiply(Expression.Constant(2.0), f1));
    681             result = Expression.Subtract(result, Expression.Multiply(Expression.Constant(2.0), f3));
    682             result = Expression.Subtract(result, f4);
    683             return Expression.Divide(result, Expression.Constant(8.0));
    684           }
    685641        default:
    686642          throw new NotSupportedException("Unsupported symbol: " + node.Symbol);
    … …  
    688644      #endregion
    689645    }
    690     // util stuff
    691     private static Func<T, R> GetField<T, R>(string fieldName) {
    692       ParameterExpression param = Expression.Parameter(typeof(T), "arg");
    693       MemberExpression member = Expression.Field(param, fieldName);
    694       LambdaExpression lambda = Expression.Lambda(typeof(Func<T, R>), member, param);
    695       Func<T, R> compiled = (Func<T, R>)lambda.Compile();
    696       return compiled;
    697     }
    698646  }
    699647}
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