Fix a typo.

src/icosagon/bulkdec.py

@@ -44,7 +44,7 @@ def convert_decoder(dec):
         local_variation = torch.eye(dec.input_dim, dec.input_dim)
         local_variation = [ local_variation ] * dec.num_relation_types
     else:
-        raise TypeError('Unknown decoder type in covert_decoder()')
+        raise TypeError('Unknown decoder type in convert_decoder()')
 
     if not isinstance(local_variation, torch.Tensor):
         local_variation = map(lambda a: a.view(1, *a.shape), local_variation)