Hi Kevin,

Thanks for your reply.

I am trying to adapt the model to tf1, e.g., 'NonMaxSuppressionV5' in tf2 to ' 
NonMaxSuppressionV3', which is supported by tensorflow frontend. 

The computational graph .pb file seems fine now.

However, when running 
~~~~
mod, params = relay.frontend.from_tensorflow(graph_def,
                                             layout=layout,
                                             shape=shape_dict)
~~~~ 

still get three unsupported operators related to the pre-processing the input 
data. 

~~~~
NotImplementedError: The following operators are not implemented: 
{'TensorListStack', 'TensorListReserve', 'While'}

~~~~

Thanks again.





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