Fix: bf16 support for inference (#981)

* Fix: bf16 torch dtype

* simplify casting to device and dtype

---------

Co-authored-by: Wing Lian <wing.lian@gmail.com>

src/axolotl/cli/__init__.py

@@ -103,7 +103,7 @@ def do_inference(
             importlib.import_module("axolotl.prompters"), prompter
         )
 
-    model = model.to(cfg.device)
+    model = model.to(cfg.device, dtype=cfg.torch_dtype)
 
     while True:
         print("=" * 80)
@@ -168,7 +168,7 @@ def do_inference_gradio(
             importlib.import_module("axolotl.prompters"), prompter
         )
 
-    model = model.to(cfg.device)
+    model = model.to(cfg.device, dtype=cfg.torch_dtype)
 
     def generate(instruction):
         if not instruction: