move out zero grad logic into separate function #969
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Summary:
Context
Currently it isn't possible to log gradients from AutoUnit as they are zeroed out before
on_train_step_end()
is reached.This Diff
Moves out the zeroed grad from the
_update_weights
and into it's own function. Can be overridden, ieto log the gradients prior to zeroing them out
Reviewed By: galrotem
Differential Revision: D68983117