allow integer device for BatchEncoding (#9271)

Fixes #9244

Co-authored-by: Jethro Kuan <jethro.kuan@bytedance.com>

src/transformers/tokenization_utils_base.py

@@ -781,7 +781,7 @@ class BatchEncoding(UserDict):
         # This check catches things like APEX blindly calling "to" on all inputs to a module
         # Otherwise it passes the casts down and casts the LongTensor containing the token idxs
         # into a HalfTensor
-        if isinstance(device, str) or isinstance(device, torch.device):
+        if isinstance(device, str) or isinstance(device, torch.device) or isinstance(device, int):
             self.data = {k: v.to(device=device) for k, v in self.data.items()}
         else:
             logger.warning(