remove fstring

Author: pmeier

torchvision/transforms/functional.py

@@ -115,7 +115,7 @@ def convert_image_dtype(image: torch.Tensor, dtype: torch.dtype = torch.float) -
         if (image.dtype == torch.float32 and dtype in (torch.int32, torch.int64)) or (
             image.dtype == torch.float64 and dtype == torch.int64
         ):
-            msg = f"The cast from {image.dtype} to {dtype} cannot be performed safely."
+            msg = "The cast from {} to {} cannot be performed safely.".format(image.dtype, dtype)
             raise RuntimeError(msg)
 
         eps = 1e-3