as titled. Performance concern, mentioned in https://github.com/pytorch/pytorch/pull/28926#issuecomment-548811359 Docstring declaration point, mentioned in https://github.com/pytorch/pytorch/pull/28926#issuecomment-550107312 Ask for moving docstring for `RpcAgent.get_timeout()`, from https://github.com/pytorch/pytorch/pull/29341#discussion_r344977185 cc @pietern @mrshenli @pritamdamania87 @zhaojuanmao @satgera @gqchen @aazzolini @rohan-varma @xush6528