rm input dtype change in CPU (#28631)

* rm input dtype change in CPU

* add warning when use CPU low-precision

* rm useless logging

src/transformers/pipelines/base.py

@@ -1019,8 +1019,6 @@ class Pipeline(_ScikitCompat):
         elif isinstance(inputs, tuple):
             return tuple([self._ensure_tensor_on_device(item, device) for item in inputs])
         elif isinstance(inputs, torch.Tensor):
-            if device == torch.device("cpu") and inputs.dtype in {torch.float16, torch.bfloat16}:
-                inputs = inputs.float()
             return inputs.to(device)
         else:
             return inputs