change default setting

Author: fsx950223

efficientdet/tf2/postprocess.py

@@ -183,7 +183,7 @@ def nms(params, boxes: T, scores: T, classes: T,
     score_thresh = nms_configs['score_thresh'] or float('-inf')
   elif method == 'gaussian':
     sigma = nms_configs['sigma'] or 0.5
-    iou_thresh = 1.0
+    iou_thresh = 0.5
     score_thresh = nms_configs['score_thresh'] or 0.001
   else:
     raise ValueError('Inference has invalid nms method {}'.format(method))