Fix AngleChangeEvaluator

estimator.py

@@ -227,7 +227,7 @@ class AngleChangeEvaluator(BaseEvaluator):
             cos_angle = (ba * bc).sum().clamp(-1.0, 1.0)
             return torch.acos(cos_angle) * 180.0 / torch.pi
 
-        angle_diff = torch.abs(compute_angle(self.frame2) - compute_angle(self.frame1))
+        angle_diff = torch.abs(compute_angle(-1) - compute_angle(0))
         return torch.tensor([angle_diff > self.threshold]) if self.greater_than else torch.tensor([angle_diff < self.threshold])