Changeset 8952

Timestamp:

11/27/12 13:35:51 (11 years ago)

Author:

mkommend

Message:

#1976: Performance improvements in AutoDiff library.

Location:

trunk/sources/HeuristicLab.ExtLibs/HeuristicLab.AutoDiff/1.0/AutoDiff-1.0

Files:

• CompiledDifferentiator.cs (modified) (1 diff)
• ParametricCompiledTerm.cs (modified) (2 diffs)

trunk/sources/HeuristicLab.ExtLibs/HeuristicLab.AutoDiff/1.0/AutoDiff-1.0/CompiledDifferentiator.cs

@@ -54 +54 @@
             ReverseSweep();
 
-            var gradient = tape.Take(Dimension).Select(elem => elem.Adjoint).ToArray();
-            var value = tape.Last().Value;
+            var gradient = new double[Dimension];
+            for (int i = 0; i < Dimension; i++)
+               gradient[i] = tape[i].Adjoint;
+            var value = tape.Last().Value;            
 
             return Tuple.Create(gradient, value);

trunk/sources/HeuristicLab.ExtLibs/HeuristicLab.AutoDiff/1.0/AutoDiff-1.0/ParametricCompiledTerm.cs

@@ -20 +20 @@
         public double Evaluate(double[] arg, double[] parameters)
         {
-            var combinedArg = arg.Concat(parameters).ToArray();
+            var combinedArg = new double[arg.Length + parameters.Length];
+            arg.CopyTo(combinedArg, 0);
+            parameters.CopyTo(combinedArg, arg.Length);
             return compiledTerm.Evaluate(combinedArg);
         }
@@ -26 +28 @@
         public Tuple<double[], double> Differentiate(double[] arg, double[] parameters)
         {
-            var combinedArg = arg.Concat(parameters).ToArray();
+            var combinedArg = new double[arg.Length + parameters.Length];
+            arg.CopyTo(combinedArg, 0);
+            parameters.CopyTo(combinedArg, arg.Length);
             var diffResult = compiledTerm.Differentiate(combinedArg);