Added the is_sequence_labeling_problem() routine.

dlib/svm/svm.h

@@ -175,6 +175,29 @@ namespace dlib
                                  vector_to_matrix(y_test));
     }
 
+// ----------------------------------------------------------------------------------------
+
+    template <
+        typename sample_type
+        >
+    bool is_sequence_labeling_problem (
+        const std::vector<std::vector<sample_type> >& samples,
+        const std::vector<std::vector<unsigned long> >& labels
+    )
+    {
+        if (is_learning_problem(samples, labels))
+        {
+            for (unsigned long i = 0; i < samples.size(); ++i)
+            {
+                if (samples[i].size() != labels[i].size())
+                    return false;
+            }
+            return true;
+        }
+
+        return false;
+    }
+
 // ----------------------------------------------------------------------------------------
 
     template <

dlib/svm/svm_abstract.h

@@ -62,6 +62,23 @@ namespace dlib
                     - x_labels(i) == -1 or +1
     !*/
 
+    template <
+        typename sample_type
+        >
+    bool is_sequence_labeling_problem (
+        const std::vector<std::vector<sample_type> >& samples,
+        const std::vector<std::vector<unsigned long> >& labels
+    );
+    /*!
+        ensures
+            - returns true if all of the following are true and false otherwise:
+                - is_learning_problem(samples, labels) == true
+                - for all valid i:
+                    - samples[i].size() == labels[i].size()
+                      (i.e. The size of a label sequence need to match the size of 
+                      its corresponding sample sequence)
+    !*/
+
 // ----------------------------------------------------------------------------------------
 // ----------------------------------------------------------------------------------------
 // ----------------------------------------------------------------------------------------