diff --git a/quapy/data/base.py b/quapy/data/base.py
index e68bcfa..ffd7e31 100644
--- a/quapy/data/base.py
+++ b/quapy/data/base.py
@@ -189,6 +189,10 @@ class Dataset:
     def classes_(self):
         return self.training.classes_
 
+    @property
+    def n_classes(self):
+        return self.training.n_classes
+
     @property
     def binary(self):
         return self.training.binary