[TensorExpr] Add a mechanism to register custom TS->NNC lowerings in TensorExprKernel. (#60804)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/60804
The lowerings are stored as a map c10::Symbol -> std::function and the
signature of thoese functions match the signature of
`computeOperandValue`. Custom lowerings have higher priority over the
standard ones, i.e. we can redefine how a given op is lowered.
In general this feature is aimed at unblocking users whose models
contain ops that are not yet supported by NNC - it allows to quickly add
a custom lowering for a given op.
Test Plan: Imported from OSS
Reviewed By: bertmaher
Differential Revision: D29409580
Pulled By: ZolotukhinM
fbshipit-source-id: e8e8dc9d3cb9155cfbf5c08a4216ba1b5b791a60
Author
Mikhail Zolotukhin
