Directly load GPTBigCode to specified device (#618)

This PR directly load GPTBigCode to specified device, avoiding moving
model between devices.

# What does this PR do?
This PR directly load GPTBigCode to specified device, avoiding moving
model between devices.


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- [ ] This PR fixes a typo or improves the docs (you can dismiss the
other checks if that's the case).
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      Pull Request section?
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- [ ] Did you write any new necessary tests?


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@OlivierDehaene OR @Narsil

server/text_generation_server/models/santacoder.py

@@ -51,14 +51,14 @@ class SantaCoder(CausalLM):
                 "pad_token": EOD,
             }
         )
-
+        with device:
             model = AutoModelForCausalLM.from_pretrained(
                 model_id,
                 revision=revision,
                 torch_dtype=dtype,
                 load_in_8bit=quantize == "bitsandbytes",
                 trust_remote_code=trust_remote_code,
-        ).to(device)
+            )
 
         super(CausalLM, self).__init__(
             model=model,