How can I undo git reset --hard HEAD~1?

Question

Is it possible to undo the changes caused by the following command? If so, how?

git reset --hard HEAD~1

Answer 1

git reflog and back to the last HEAD 6a56624 (HEAD -> master) HEAD@{0}: reset: moving to HEAD~3 1a9bf73 HEAD@{1}: commit: add changes in model generate binary