New to this community and still try to learn more.

At the minute, I would like to use TVM to optimise a tensorflow model that uses 
some operators from tensorflow 2.2. 

Use relay.frontend.from_tensorflow to import the model, 
~~~~
mod, params = relay.frontend.from_tensorflow(graph_def,
                                             layout=layout,
                                             shape=shape_dict)
~~~~
I got the following information:

~~~~
NotImplementedError: The following operators are not implemented: {'While', 
'NonMaxSuppressionV5', 'TensorListStack', 'TensorListReserve'}
~~~~

I noticed that there are NonMaxSuppressionV2 V3 operators. However, there is no 
implementation on 'While', 'TensorListStack', 'TensorListReserve'.  

I wonder if there is a plan to implement these operators. Or any advice on how 
to implement these operators. 

Thanks in advance.





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