remove modality from builder args

Author: anirudh

torchchat/cli/builder.py

@@ -71,7 +71,6 @@ class BuilderArgs:
     dynamic_shapes: bool = False
     max_seq_length: Optional[int] = None
     attention_backend: str = "math"
-    modality: Optional[str] = "text"
 
     def __post_init__(self):
         if self.device is None:
@@ -147,10 +146,6 @@ def from_args(cls, args: argparse.Namespace) -> "BuilderArgs":
         aoti_package_path = getattr(args, "aoti_package_path", None)
         snapshot_path = getattr(args, "snapshot_path", None)
 
-        modality = "text"
-        if args.modality:
-            modality = args.modality
-
         is_chat_model = False
         if args.is_chat_model:
             is_chat_model = True
@@ -231,7 +226,6 @@ def from_args(cls, args: argparse.Namespace) -> "BuilderArgs":
             chpt_from=chpt_from,
             distribution_path=distribution_path,
             is_chat_model=is_chat_model,
-            modality=modality,
             dynamic_shapes=getattr(args, "dynamic_shapes", False),
             max_seq_length=getattr(args, "max_seq_length", None),
             attention_backend=attention_backend,