Ok can't remove import lm_eval. Move it inside eval condition

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Author: larryliu0820

torchchat.py

@@ -82,6 +82,7 @@
 
         generate_main(args)
     elif args.command == "eval":
+        import lm_eval  # noqa
         from torchchat.usages.eval import main as eval_main
 
         eval_main(args)

torchchat/cli/cli.py

@@ -14,7 +14,7 @@
 import torch
 
 from torchchat.cli.download import download_and_convert, is_model_downloaded
-
+import lm_eval  # noqa
 from torchchat.utils.build_utils import (
     allowable_dtype_names,
     allowable_params_table,