[feat] Add __str__ to autoPyTorchEnum (#405)

Author: nabenabe0928

autoPyTorch/utils/common.py

@@ -101,6 +101,9 @@ def __eq__(self, other: Any) -> bool:
     def __hash__(self) -> int:
         return hash(self.value)
 
+    def __str__(self) -> str:
+        return str(self.value)
+
 
 def custom_collate_fn(batch: List) -> List[Optional[torch.Tensor]]:
     """