No hardcoded default checkpoints

Summary: No hardcoded default checkpoints

Reviewed By: cpuhrsch

Differential Revision: D55409487

Author: Michael Gschwind

examples/models/llama2/export_llama_lib.py

@@ -237,8 +237,10 @@ def quantize(
     else:
         torch_dtype = torch.float16
 
-    if checkpoint_path is None:
-        checkpoint_path = Path("checkpoints/meta-llama/Llama-2-7b-chat-hf/model.pth")
+    assert checkpoint_path, "Need to specify a checkpoint"
+    assert os.path.isfile(checkpoint_path), f"{checkpoint_path} does not exist"
+    # if checkpoint_path is None:
+    #     checkpoint_path = Path("checkpoints/meta-llama/Llama-2-7b-chat-hf/model.pth")
 
     if calibration_tasks is None:
         calibration_tasks = ["wikitext"]