[BUGFIX] Use _forward in LVQ1 and LVQ21

prototorch/models/glvq.py

@@ -281,7 +281,7 @@ class LVQ1(NonGradientGLVQ):
         # TODO Vectorized implementation
 
         for xi, yi in zip(x, y):
-            d = self(xi.view(1, -1))
+            d = self._forward(xi.view(1, -1))
             preds = wtac(d, plabels)
             w = d.argmin(1)
             if yi == preds:
@@ -312,7 +312,7 @@ class LVQ21(NonGradientGLVQ):
         for xi, yi in zip(x, y):
             xi = xi.view(1, -1)
             yi = yi.view(1, )
-            d = self(xi)
+            d = self._forward(xi)
             (_, wp), (_, wn) = _get_dp_dm(d, yi, plabels, with_indices=True)
             shiftp = xi - protos[wp]
             shiftn = protos[wn] - xi