Update app.py

app.py

@@ -36,6 +36,7 @@ import os
 import argparse
 from omegaconf import OmegaConf
 from rembg import remove
+from collections import defaultdict
 from engine.pose_estimation.pose_estimator import PoseEstimator
 from LHM.utils.face_detector import VGGHeadDetector
 from LHM.utils.hf_hub import wrap_model_hub