[ao] Removing memoryless observer args for MovingAverage (#73947)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/73947
The original implementation of memoryless observers used MinMaxObservers and
a memoryless argument to manipulate the behavior of the observer such that it wouldn't
keep track of previously observed min and max's. It was later pointed
out that this was equivalent to a movingaverageobserver with averaging_constant=1
which is requires less overhead and no 1 off args (memoryless) so this PR refactors
the memoryless arg and uses MovingAverage observers instead, although the memoryless
adjective is still used, a complete definintion was also added to clarify error
messages given these changes.
TestPlan
python test/test_quantization.py TestQuantizeEagerQAT
python test/test_quantization.py TestObserver
Test Plan: Imported from OSS
Reviewed By: andrewor14
Differential Revision: D34732080
Pulled By: HDCharles
fbshipit-source-id: 227a1ab29d18adae55093a684ea35ac34523d07a
(cherry picked from commit 5238e70e8f90f3219c36f9c64b647951dcf64b5a)
