Kh4L opened a new pull request #18378:
URL: https://github.com/apache/incubator-mxnet/pull/18378


   ## Description ##
   As described in #16757 , a list of operators have their FInferType functions 
were throwing an exception if the input type is not defined (dtype=-1).
   
   This was preventing us from running a partial or backward type inference 
where some not (yet) defined input dtypes would trigger an exception.
   
   
   This PR fixes it by making the FInferType functions do backward inference 
when input is `none` but output is known and return false when both input and 
output dtype is `none`.


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