[GitHub] [incubator-tvm] wweic opened a new pull request #4325: [Prelude][Relay] Add get tensor data utilities

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wweic opened a new pull request #4325: [Prelude][Relay] Add get tensor data utilities
URL: https://github.com/apache/incubator-tvm/pull/4325
 
 
   This implements issue https://github.com/apache/incubator-tvm/issues/4291.
   
   I also applied the optimization in tensorflow converter that it keeps track of all the ins and outs of every tensor array, so we can determine if a tensor array is homogeneous or not. If true, we will directly extract the tensor out of the `tensor_t` object, and it will eliminate the trouble of reading from `tensor_t`.
   
   We should do the same optimization in the future when we encounter operators that needs to use `tensor_t` objects.
   
   cc @zhiics @icemelon9 @yongwww @kevinthesun @srkreddy1238 @jroesch @slyubomirsky 

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