Impala Documentation

virtual svm_problem* Impala::Core::Training::TrainDataSrcFeature::MakeSvmProblem ( int i ) [inline, virtual]

create an svm_problem of *one* example

The returned structure must be deleted with FreeProblem().

Implements Impala::Core::Training::TrainDataSrc.

Definition at line 89 of file TrainDataSrcFeature.h.

References Impala::Core::Feature::FeatureTable::FindFeature(), GetFeatureTableWithCache(), Impala::Core::Training::TrainDataSrc::GetQuid(), ILOG_ERROR, Impala::Core::Training::TrainDataSrc::MakeEmptyProblem(), Impala::Core::Training::SvmProblemBuilder::MakeProblem(), Impala::Core::Training::TrainDataSrc::mAnnotation, Impala::Core::Training::TrainDataSrc::mSelection, and Impala::QuidObject().

00090     {
00091         Quid q = GetQuid(i);
00092         // note that the object of a frame quid is its video, which is a dirId
00093         int videoId = QuidObject(q);
00094         // open table (cached) and access correct line
00095         Feature::FeatureTable* table = GetFeatureTableWithCache(videoId);
00096         if(table == 0)
00097         {
00098             ILOG_ERROR("could not open features for video #" << videoId);
00099             return MakeEmptyProblem();
00100         }
00101         VectorReal64 vector = table->FindFeature(q);
00102             // how can we check for validity of vector?
00103         SvmProblemBuilder pb(mAnnotation, mSelection);
00104         svm_problem* ret = pb.MakeProblem(&vector);
00105         return ret;
00106     }

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