Change test threshold to resolve flaky test.

Author: datumbox

test/expect/ModelTester.test_fasterrcnn_mobilenet_v3_large_320_fpn_expect.pkl

@@ -110,7 +110,9 @@ def _test_detection_model(self, name, dev):
         elif "fasterrcnn_mobilenet_v3_large_fpn" in name:
             kwargs["box_score_thresh"] = 0.02076
         elif "fasterrcnn_mobilenet_v3_large_320_fpn" in name:
-            kwargs["box_score_thresh"] = 0.0208
+            kwargs["box_score_thresh"] = 0.02082
+            kwargs["rpn_pre_nms_top_n_test"] = 1000
+            kwargs["rpn_post_nms_top_n_test"] = 1000
         model = models.detection.__dict__[name](num_classes=50, pretrained_backbone=False, **kwargs)
         model.eval().to(device=dev)
         input_shape = (3, 300, 300)