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 86 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().

00087     {
00088         Quid q = GetQuid(i);
00089         // note that the object of a frame quid is its video, which is a dirId
00090         int videoId = QuidObject(q);
00091         // open table (cached) and access correct line
00092         Feature::FeatureTable* table = GetFeatureTableWithCache(videoId);
00093         if (table == 0)
00094         {
00095             ILOG_ERROR("could not open features for video #" << videoId);
00096             return MakeEmptyProblem();
00097         }
00098         VectorReal64 vector = table->FindFeature(q);
00099             // how can we check for validity of vector?
00100         SvmProblemBuilder pb(mAnnotation, mSelection);
00101         svm_problem* ret = pb.MakeProblem(&vector);
00102         return ret;
00103     }

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