revert convert as well

src/transformers/onnx/convert.py

@@ -209,11 +209,10 @@ def export_tensorflow(
         `Tuple[List[str], List[str]]`: A tuple with an ordered list of the model's inputs, and the named inputs from
         the ONNX configuration.
     """
+    import onnx
     import tensorflow as tf
     import tf2onnx
 
-    import onnx
-
     if isinstance(preprocessor, PreTrainedTokenizerBase) and tokenizer is not None:
         raise ValueError("You cannot provide both a tokenizer and preprocessor to export the model.")
     if tokenizer is not None: