put max_iou fix in call rather then line just for that

user-friendly-metrics.py

@@ -133,15 +133,13 @@ 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()))
 
     acc = mm.MOTAccumulator(auto_id=True)
     for i in range(1, num_frames+1):
         preds = np_predictions[np_predictions[:, 0] == i, 1:6]
         refs = np_references[np_references[:, 0] == i, 1:6]
-        C = mm.distances.iou_matrix(refs[:,1:], preds[:,1:], max_iou = max_iou)
+        C = mm.distances.iou_matrix(refs[:,1:], preds[:,1:], max_iou = 1-max_iou) #motmetrics expects iou association threshold to be smaller for stricter association
         acc.update(refs[:,0].astype('int').tolist(), preds[:,0].astype('int').tolist(), C)
 
     mh = mm.metrics.create()