Bug in reset method

[neal2164]

DI-engine/ding/model/wrapper/model_wrappers.py

Line 76 in de9ada0

pass

pass should be replaced by code like
if hasattr(self._model, 'reset'): return self._model.reset(data_id=data_id, *args, **kwargs)

This bug can cause many issues.

For instance, if a model is first wrapped by the HiddenStatesWrapper then the EpsGreedyWrapper, calling reset method will not reset states.

[PaParaZz1]

Thanks for your feedback, we have fixed this problem in the similar way you mentioned. The nesting problem between multiple model wrappers is indeed a challenging matter.