Changeset 8730
 Timestamp:
 10/04/12 11:43:38 (7 years ago)
 Location:
 trunk/sources
 Files:

 2 edited
Legend:
 Unmodified
 Added
 Removed

trunk/sources/HeuristicLab.Problems.DataAnalysis.Symbolic.Regression.Views/3.4/InteractiveSymbolicRegressionSolutionSimplifierView.cs
r8727 r8730 122 122 } 123 123 124 protected override void OnModelChanged() { 125 base.OnModelChanged(); 126 btnOptimizeConstants.Enabled = 127 SymbolicRegressionConstantOptimizationEvaluator.CanOptimizeConstants(Content.Model.SymbolicExpressionTree); 128 } 129 protected override void OnContentChanged() { 130 base.OnContentChanged(); 131 base.OnModelChanged(); 132 btnOptimizeConstants.Enabled = 133 SymbolicRegressionConstantOptimizationEvaluator.CanOptimizeConstants(Content.Model.SymbolicExpressionTree); 134 } 135 136 124 137 protected override void btnOptimizeConstants_Click(object sender, EventArgs e) { 125 138 var model = Content.Model; 
trunk/sources/HeuristicLab.Problems.DataAnalysis.Symbolic.Regression/3.4/SingleObjective/Evaluators/SymbolicRegressionConstantOptimizationEvaluator.cs
r8704 r8730 157 157 } 158 158 159 // create function factory for arctangent 160 private readonly Func<Term, UnaryFunc> arctan = UnaryFunc.Factory( 161 x => Math.Atan(x), // evaluate 162 x => 1 / (1 + x * x)); // derivative of atan 163 164 private static readonly Func<Term, UnaryFunc> sin = UnaryFunc.Factory( 165 x => Math.Sin(x), 166 x => Math.Cos(x)); 167 private static readonly Func<Term, UnaryFunc> cos = UnaryFunc.Factory( 168 x => Math.Cos(x), 169 x => Math.Sin(x)); 170 private static readonly Func<Term, UnaryFunc> tan = UnaryFunc.Factory( 171 x => Math.Tan(x), 172 x => 1 + Math.Tan(x) * Math.Tan(x)); 173 private static readonly Func<Term, UnaryFunc> square = UnaryFunc.Factory( 174 x => x * x, 175 x => 2 * x); 176 private static readonly Func<Term, UnaryFunc> erf = UnaryFunc.Factory( 177 x => alglib.errorfunction(x), 178 x => 2.0 * Math.Exp((x * x)) / Math.Sqrt(Math.PI)); 179 180 private static readonly Func<Term, UnaryFunc> norm = UnaryFunc.Factory( 181 x => alglib.normaldistribution(x), 182 x => (Math.Exp((x * x)) * Math.Sqrt(Math.Exp(x * x)) * x) / Math.Sqrt(2 * Math.PI) 183 ); 184 185 159 186 public static double OptimizeConstants(ISymbolicDataAnalysisExpressionTreeInterpreter interpreter, ISymbolicExpressionTree tree, IRegressionProblemData problemData, 160 187 IEnumerable<int> rows, bool applyLinearScaling, int maxIterations, double upperEstimationLimit = double.MaxValue, double lowerEstimationLimit = double.MinValue, IntValue evaluatedTrees = null, IntValue evaluatedTreeNodes = null) { … … 216 243 217 244 } 245 catch (ArithmeticException) { 246 return 0.0; 247 } 218 248 catch (alglib.alglibexception) { 219 249 return 0.0; … … 345 375 return true; 346 376 } 377 } if (node.Symbol is Sine) { 378 AutoDiff.Term t; 379 if (!TryTransformToAutoDiff(node.GetSubtree(0), variables, parameters, variableNames, out t)) { 380 term = null; 381 return false; 382 } else { 383 term = sin(t); 384 return true; 385 } 386 } if (node.Symbol is Cosine) { 387 AutoDiff.Term t; 388 if (!TryTransformToAutoDiff(node.GetSubtree(0), variables, parameters, variableNames, out t)) { 389 term = null; 390 return false; 391 } else { 392 term = cos(t); 393 return true; 394 } 395 } if (node.Symbol is Tangent) { 396 AutoDiff.Term t; 397 if (!TryTransformToAutoDiff(node.GetSubtree(0), variables, parameters, variableNames, out t)) { 398 term = null; 399 return false; 400 } else { 401 term = tan(t); 402 return true; 403 } 404 } 405 if (node.Symbol is Square) { 406 AutoDiff.Term t; 407 if (!TryTransformToAutoDiff(node.GetSubtree(0), variables, parameters, variableNames, out t)) { 408 term = null; 409 return false; 410 } else { 411 term = square(t); 412 return true; 413 } 414 } if (node.Symbol is Erf) { 415 AutoDiff.Term t; 416 if (!TryTransformToAutoDiff(node.GetSubtree(0), variables, parameters, variableNames, out t)) { 417 term = null; 418 return false; 419 } else { 420 term = erf(t); 421 return true; 422 } 423 } if (node.Symbol is Norm) { 424 AutoDiff.Term t; 425 if (!TryTransformToAutoDiff(node.GetSubtree(0), variables, parameters, variableNames, out t)) { 426 term = null; 427 return false; 428 } else { 429 term = norm(t); 430 return true; 431 } 347 432 } 348 433 if (node.Symbol is StartSymbol) { … … 363 448 return false; 364 449 } 450 451 public static bool CanOptimizeConstants(ISymbolicExpressionTree tree) { 452 var containsUnknownSymbol = ( 453 from n in tree.Root.GetSubtree(0).IterateNodesPrefix() 454 where 455 !(n.Symbol is Variable) && 456 !(n.Symbol is Constant) && 457 !(n.Symbol is Addition) && 458 !(n.Symbol is Subtraction) && 459 !(n.Symbol is Multiplication) && 460 !(n.Symbol is Division) && 461 !(n.Symbol is Logarithm) && 462 !(n.Symbol is Exponential) && 463 !(n.Symbol is Sine) && 464 !(n.Symbol is Cosine) && 465 !(n.Symbol is Tangent) && 466 !(n.Symbol is Square) && 467 !(n.Symbol is Erf) && 468 !(n.Symbol is Norm) && 469 !(n.Symbol is StartSymbol) 470 select n). 471 Any(); 472 return !containsUnknownSymbol; 473 } 365 474 } 366 475 }
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