Exposing adding additional parameters for observers.

Summary:
Pull Request resolved: https://github.com/facebookresearch/d2go/pull/586

Adding additional parameters for observers

Reviewed By: navsud

Differential Revision: D46136523

fbshipit-source-id: ce44d4cdfcd4ef8524f85eb148ee789137fa8abf

d2go/quantization/modeling.py

@@ -176,6 +176,8 @@ def add_quantization_default_configs(_C):
     # after update_observer_stats_period iters
     _C.QUANTIZATION.QAT.UPDATE_OBSERVER_STATS_PERIODICALLY = False
     _C.QUANTIZATION.QAT.UPDATE_OBSERVER_STATS_PERIOD = 1
+    _C.QUANTIZATION.WEIGHT_OBSERVERS = None
+    _C.QUANTIZATION.ACTIVATION_OBSERVERS = None
 
     # post-training quantization
     _C.QUANTIZATION.PTQ = CfgNode()