add the tensor_observer to record the runtime tensor for quantization … (#25830)
Summary:
…accuracy analsyis
Pull Request resolved: https://github.com/pytorch/pytorch/pull/25830
Differential Revision: D17327147
Pulled By: llyfacebook
fbshipit-source-id: 095d5537a31b8d7541081000eaeb8b8474dfb8d0
