Add causal person fusion and MuVAP stage-3 baselines

third_party/EgoSpeak/MiniROAD/trainer/train_builder.py

@@ -0,0 +1,11 @@
+__all__ = [
+    'build_trainer'
+]
+
+from utils import Registry
+
+TRAINER = Registry()
+
+def build_trainer(cfg):
+    trainer = TRAINER[cfg["task"]]
+    return trainer