[Prelude][Relay] Add get tensor data utilities #4325
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This implements issue #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 fromtensor_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