Enforced DecisionFunction vector indexes to be saved on SVM save/load methods

modules/ml/src/svm.cpp

@@ -2092,7 +2092,7 @@ public:
                << "alpha" << "[:";
             fs.writeRaw("d", (const uchar*)&df_alpha[df.ofs], sv_count*sizeof(df_alpha[0]));
             fs << "]";
-            if( class_count > 2 )
+            if( class_count >= 2 )
             {
                 fs << "index" << "[:";
                 fs.writeRaw("i", (const uchar*)&df_index[df.ofs], sv_count*sizeof(df_index[0]));
@@ -2234,11 +2234,11 @@ public:
             df_index.resize(ofs + sv_count);
             df_alpha.resize(ofs + sv_count);
             dfi["alpha"].readRaw("d", (uchar*)&df_alpha[ofs], sv_count*sizeof(df_alpha[0]));
-            if( class_count > 2 )
+            if( class_count >= 2 )
                 dfi["index"].readRaw("i", (uchar*)&df_index[ofs], sv_count*sizeof(df_index[0]));
             decision_func.push_back(df);
         }
-        if( class_count <= 2 )
+        if( class_count < 2 )
             setRangeVector(df_index, sv_total);
         if( (int)fn["optimize_linear"] != 0 )
             optimize_linear_svm();