fix trt int8 inference (#6387)

tools/infer/utility.py

@@ -202,7 +202,8 @@ def create_predictor(args, mode, logger):
                     workspace_size=1 << 30,
                     precision_mode=precision,
                     max_batch_size=args.max_batch_size,
-                    min_subgraph_size=args.min_subgraph_size)
+                    min_subgraph_size=args.min_subgraph_size,
+                    use_calib_mode=False)
                 # skip the minmum trt subgraph
             use_dynamic_shape = True
             if mode == "det":