Rename variables and add comments (#27286)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/27286
The name `runUDFFunction` stutters because the F in UDF also stands
for function. Renamed these variables to be identical to their Python
equivalents. Renamed those to share a prefix and drop `internal`,
because internal functions can use an underscore prefix.
Test Plan: Imported from OSS
Differential Revision: D17808208
Pulled By: pietern
fbshipit-source-id: 7619f07fc8215203dfb1da1eb281845edcd2bb99
