{"action":"opened","issue":{"url":"https://api.github.com/repos/facebookresearch/fairseq-py/issues/123","repository_url":"https://api.github.com/repos/facebookresearch/fairseq-py","labels_url":"https://api.github.com/repos/facebookresearch/fairseq-py/issues/123/labels{/name}","comments_url":"https://api.github.com/repos/facebookresearch/fairseq-py/issues/123/comments","events_url":"https://api.github.com/repos/facebookresearch/fairseq-py/issues/123/events","html_url":"https://github.com/facebookresearch/fairseq-py/issues/123","id":304153298,"number":123,"title":"what is left_pad ?","user":{"login":"travel-go","id":31921471,"avatar_url":"https://avatars1.githubusercontent.com/u/31921471?v=4","gravatar_id":"","url":"https://api.github.com/users/travel-go","html_url":"https://github.com/travel-go","followers_url":"https://api.github.com/users/travel-go/followers","following_url":"https://api.github.com/users/travel-go/following{/other_user}","gists_url":"https://api.github.com/users/travel-go/gists{/gist_id}","starred_url":"https://api.github.com/users/travel-go/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/travel-go/subscriptions","organizations_url":"https://api.github.com/users/travel-go/orgs","repos_url":"https://api.github.com/users/travel-go/repos","events_url":"https://api.github.com/users/travel-go/events{/privacy}","received_events_url":"https://api.github.com/users/travel-go/received_events","type":"User","site_admin":false},"labels":[],"state":"open","locked":false,"assignee":null,"assignees":[],"milestone":null,"comments":0,"created_at":"2018-03-11T12:14:50Z","updated_at":"2018-03-11T12:14:50Z","closed_at":null,"author_association":"NONE","body":"Hello, I recently recreated fairseq.When I see learned_postitional_embedding.py,I do not particularly understand the function of self.left_pad.What do the input's data operations?\r\nBy the way, what is masked_scatter?"}}
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