Update demo.py

demo.py

@@ -117,8 +117,14 @@ class BaseTrainer(object):
             logger.info(self.model)
             logger.info(f"init {cfg.model.g_name} success")
 
+        smplx_path = Path(self.args.data_path_1) / "smplx_models"
+        if not smplx_path.exists():
+            raise FileNotFoundError(
+                "SMPL-X model directory missing at {}. Ensure assets are downloaded or"
+                " set HF_GESTURELSM_WEIGHTS_REPO with smplx_models.".format(smplx_path)
+            )
         self.smplx = smplx.SMPLX(
-            model_path=self.args.data_path_1 + "smplx_models/",
+            model_path=str(smplx_path),
             gender='NEUTRAL_2020',
             use_face_contour=False,
             num_betas=300,