iou inverted "fix"

user-friendly-metrics.py

@@ -133,6 +133,7 @@ def calculate(predictions,
     if np_references[:, 0].min() <= 0:
         raise ValueError("The frame number in the references should be a positive integer")
 
+    max_iou = 1-max_iou #motmetrics expects iou association threshold to be smaller for stricter association
 
     num_frames = int(max(np_references[:, 0].max(), np_predictions[:, 0].max()))