Added some missing DLIB_ASSERT statements.

--HG--
extra : convert_revision : svn%3Afdd8eb12-d10e-0410-9acb-85c331704f74/trunk%404196

dlib/svm/one_vs_all_trainer.h

@@ -86,6 +86,14 @@ namespace dlib
             const std::vector<label_type>& all_labels
         ) const
         {
+            // make sure requires clause is not broken
+            DLIB_ASSERT(is_learning_problem(all_samples,all_labels),
+                "\t trained_function_type one_vs_all_trainer::train(all_samples,all_labels)"
+                << "\n\t invalid inputs were given to this function"
+                << "\n\t all_samples.size():     " << all_samples.size() 
+                << "\n\t all_labels.size():      " << all_labels.size() 
+                );
+
             const std::vector<label_type> distinct_labels = select_all_distinct_labels(all_labels);
 
             std::vector<scalar_type> labels;

dlib/svm/one_vs_one_trainer.h

@@ -88,6 +88,14 @@ namespace dlib
             const std::vector<label_type>& all_labels
         ) const
         {
+            // make sure requires clause is not broken
+            DLIB_ASSERT(is_learning_problem(all_samples,all_labels),
+                "\t trained_function_type one_vs_one_trainer::train(all_samples,all_labels)"
+                << "\n\t invalid inputs were given to this function"
+                << "\n\t all_samples.size():     " << all_samples.size() 
+                << "\n\t all_labels.size():      " << all_labels.size() 
+                );
+
             const std::vector<label_type> distinct_labels = select_all_distinct_labels(all_labels);
 
             std::vector<sample_type> samples;