[TensorExpr] Introduce ExternalCall nodes to TE IR. (#51475)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/51475
ExternalCall nodes represent opaque calls to external functions to fill a
tensor (buffer) with values. It could be used to include nodes that are
otherwise not-representable as TE, or whose TE representation is currently too
slow.
To make an external function available in NNC as ExternalCall, one needs to
implement a "bridge" function that would take raw (void*) pointers to the data
along with the arrays containing dimension info. This function would then
internally call the desired external function and make sure the results of the
call are correctly placed in the provided raw data buffers.
Test Plan: Imported from OSS
Reviewed By: pbelevich, Chillee
Differential Revision: D26179083
Pulled By: ZolotukhinM
fbshipit-source-id: 9e44de098ae94d25772cf5e2659d539fa6f3f659
Author
Mikhail Zolotukhin
