don't load models in 8bit unless they are using an adapter, also fix tokenizer load in exceptional case

src/axolotl/utils/models.py

@@ -109,7 +109,7 @@ def load_model(
             else:
                 model = LlamaForCausalLM.from_pretrained(
                     base_model,
-                    load_in_8bit=cfg.load_in_8bit,
+                    load_in_8bit=cfg.load_in_8bit and cfg.adapter is not None,
                     torch_dtype=torch_dtype,
                     device_map=cfg.device_map,
                 )
@@ -117,14 +117,14 @@ def load_model(
         elif model_type:
             model = getattr(transformers, model_type).from_pretrained(
                 base_model,
-                load_in_8bit=cfg.load_in_8bit,
+                load_in_8bit=cfg.load_in_8bit and cfg.adapter is not None,
                 torch_dtype=torch_dtype,
                 device_map=cfg.device_map,
             )
         else:
             model = AutoModelForCausalLM.from_pretrained(
                 base_model,
-                load_in_8bit=cfg.load_in_8bit,
+                load_in_8bit=cfg.load_in_8bit and cfg.adapter is not None,
                 torch_dtype=torch_dtype,
                 device_map=cfg.device_map,
             )
@@ -135,7 +135,7 @@ def load_model(
         logging.exception(e)
         model = AutoModelForCausalLM.from_pretrained(
             base_model,
-            load_in_8bit=cfg.load_in_8bit,
+            load_in_8bit=cfg.load_in_8bit and cfg.adapter is not None,
             torch_dtype=torch_dtype,
             device_map=cfg.device_map,
         )
@@ -147,7 +147,7 @@ def load_model(
             else:
                 tokenizer = getattr(transformers, tokenizer_type).from_pretrained(model)
         except:
-            tokenizer = AutoTokenizer.from_pretrained(base_model)
+            tokenizer = AutoTokenizer.from_pretrained(base_model_config)
 
     logging.debug(f"EOS: {tokenizer.eos_token_id} / {tokenizer.eos_token}")
     logging.debug(f"BOS: {tokenizer.bos_token_id} / {tokenizer.bos_token}")