Impala Documentation

virtual double Impala::Core::Training::PrecisionAtN::Compute ( Table::AnnotationTableBaseType * table ) [inline, virtual]

Reimplemented from Impala::Core::Training::Evaluation.

Definition at line 27 of file PrecisionAtN.h.

References Impala::Core::Table::TableTem< Col1T, Col2T, Col3T, Col4T, Col5T, Col6T, Col7T, Col8T, Col9T >::Get1(), Impala::Core::Table::AnnotationTable::IsPositive(), Impala::Core::Training::Evaluation::mAnnotation, mN, Impala::Application::DemoCamera2d::precision, Impala::Core::Table::Table::Size(), and Impala::Core::Table::Sort().

00028     {
00029         Sort(table, 2, false);
00030 
00031         int positiveCount=0;
00032         int i;
00033         for(i=0 ; i<table->Size() && i<mN ; ++i)
00034         {
00035             Quid q = table->Get1(i);
00036             if(mAnnotation->IsPositive(q))
00037                 positiveCount++;
00038         }
00039         double precision = ((double)positiveCount)/((double)(i));
00040         return precision;
00041     }

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