VisionZQ edited a comment on issue #15646:
URL: 
https://github.com/apache/incubator-mxnet/issues/15646#issuecomment-647126347


   @kuonangzhe Hi,
   Are you solve those problems? 
   I meet the same issue likes 'Cannot parse ONNX into TensorRT Engine' and 
'Finding ancestor failed. There is probably a loop in the graph'
   Thank you for you reply. 
   
   `
   from gluoncv import model_zoo, data, utils
   from matplotlib import pyplot as plt
   from gluoncv.utils import export_block
   import mxnet as mx
   from mxnet.contrib import onnx as onnx_mxnet
   import numpy as np
   import time
   
   OUTPUT = "./"
   DATA = "./cat.png"
   SIZE = 416
   MODEL = "yolo3_darknet53_coco"
   INPUT_SHAPE = (1, 3, SIZE, SIZE)
   net = model_zoo.get_model('yolo3_darknet53_coco', pretrained=True)
   net.hybridize()
   x, img = data.transforms.presets.yolo.load_test("./1.jpg", short=SIZE)
   #class_IDs, scores, bounding_boxs = net(x)
   a=net(x)
   net.export("yolo3_darknet53_coco")
   sym, arg_params, aux_params = mx.model.load_checkpoint(MODEL, 0)
   batch_shape = INPUT_SHAPE
   input = mx.nd.zeros(batch_shape)
   print('Building TensorRT engine')
   trt_sym = sym.get_backend_symbol('TensorRT')
   arg_params, aux_params = mx.contrib.tensorrt.init_tensorrt_params(trt_sym, 
arg_params, aux_params)
   mx.contrib.tensorrt.set_use_fp16(False)
   executor = trt_sym.simple_bind(ctx=mx.gpu(0), data=batch_shape,
                                  grad_req='null', force_rebind=True)
   executor.copy_params_from(arg_params, aux_params)
   print('Starting TensorRT timed run')
   start = time.process_time()
   for i in range(0, 300):
       y_gen = executor.forward(is_train=False, data=input)
       y_gen[0].wait_to_read()
   end = time.time()
   print(time.process_time() - start)
   `


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