onnxruntime

913ea826 - GPT2 with one step beam search (#7163)

GPT2 with one step beam search (#7163) * beam search refactoring checkin * add factory class and deduplicate code * one step beam search works on gpu Co-authored-by: Xiaoyu Liu <xiaoyu@xiaoyu-VM.z4vh1dzj5eoevgybsksdpz2izh.jx.internal.cloudapp.net>