Attribute correction (#95)

Corrected wrong variable in distance selector

mlptrain/training/selection.py

@@ -292,7 +292,7 @@ def select(self) -> bool:
             self._configuration,
             self.mlp.training_data,
             self.pca,
-            self.distance,
+            self.metric,
             self.n_neighbors,
         )
         return metric == -1