{"action":"created","comment":{"url":"https://api.github.com/repos/pytorch/pytorch/pulls/comments/197613922","pull_request_review_id":131396739,"id":197613922,"node_id":"MDI0OlB1bGxSZXF1ZXN0UmV2aWV3Q29tbWVudDE5NzYxMzkyMg==","diff_hunk":"@@ -146,10 +321,12 @@ def step(self, closure):\n                         # shift history by one (limited-memory)\n                         old_dirs.pop(0)\n                         old_stps.pop(0)\n+                        ro.pop(0)\n \n                     # store new direction/step\n                     old_dirs.append(y)\n                     old_stps.append(s)\n+                    ro.append(1. / ys)","path":"torch/optim/lbfgs.py","position":250,"original_position":250,"commit_id":"9e92f966c19dc8b2a9f7a421b609138edf060a63","original_commit_id":"9e92f966c19dc8b2a9f7a421b609138edf060a63","user":{"login":"fehiepsi","id":4736342,"node_id":"MDQ6VXNlcjQ3MzYzNDI=","avatar_url":"https://avatars1.githubusercontent.com/u/4736342?v=4","gravatar_id":"","url":"https://api.github.com/users/fehiepsi","html_url":"https://github.com/fehiepsi","followers_url":"https://api.github.com/users/fehiepsi/followers","following_url":"https://api.github.com/users/fehiepsi/following{/other_user}","gists_url":"https://api.github.com/users/fehiepsi/gists{/gist_id}","starred_url":"https://api.github.com/users/fehiepsi/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/fehiepsi/subscriptions","organizations_url":"https://api.github.com/users/fehiepsi/orgs","repos_url":"https://api.github.com/users/fehiepsi/repos","events_url":"https://api.github.com/users/fehiepsi/events{/privacy}","received_events_url":"https://api.github.com/users/fehiepsi/received_events","type":"User","site_admin":false},"body":"by this, we don't have to recalculate ro","created_at":"2018-06-23T14:39:41Z","updated_at":"2018-06-23T14:39:41Z","html_url":"https://github.com/pytorch/pytorch/pull/8824#discussion_r197613922","pull_request_url":"https://api.github.com/repos/pytorch/pytorch/pulls/8824","author_association":"CONTRIBUTOR","_links":{"self":{"href":"https://api.github.com/repos/pytorch/pytorch/pulls/comments/197613922"},"html":{"href":"https://github.com/pytorch/pytorch/pull/8824#discussion_r197613922"},"pull_request":{"href":"https://api.github.com/repos/pytorch/pytorch/pulls/8824"}}},"pull_request":{"url":"https://api.github.com/repos/pytorch/pytorch/pulls/8824","id":196904906,"node_id":"MDExOlB1bGxSZXF1ZXN0MTk2OTA0OTA2","html_url":"https://github.com/pytorch/pytorch/pull/8824","diff_url":"https://github.com/pytorch/pytorch/pull/8824.diff","patch_url":"https://github.com/pytorch/pytorch/pull/8824.patch","issue_url":"https://api.github.com/repos/pytorch/pytorch/issues/8824","number":8824,"state":"open","locked":false,"title":"[pytorch] Add strong Wolfe line search for lbfgs","user":{"login":"fehiepsi","id":4736342,"node_id":"MDQ6VXNlcjQ3MzYzNDI=","avatar_url":"https://avatars1.githubusercontent.com/u/4736342?v=4","gravatar_id":"","url":"https://api.github.com/users/fehiepsi","html_url":"https://github.com/fehiepsi","followers_url":"https://api.github.com/users/fehiepsi/followers","following_url":"https://api.github.com/users/fehiepsi/following{/other_user}","gists_url":"https://api.github.com/users/fehiepsi/gists{/gist_id}","starred_url":"https://api.github.com/users/fehiepsi/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/fehiepsi/subscriptions","organizations_url":"https://api.github.com/users/fehiepsi/orgs","repos_url":"https://api.github.com/users/fehiepsi/repos","events_url":"https://api.github.com/users/fehiepsi/events{/privacy}","received_events_url":"https://api.github.com/users/fehiepsi/received_events","type":"User","site_admin":false},"body":"This pull request adds a line search for lbfgs. \"strong Wolfe\" is the default line search method in [minFunc](https://www.cs.ubc.ca/~schmidtm/Software/minFunc.html) and it is also recommended in the [Numerical Optimization](https://www.springer.com/gp/book/9780387303031) book.\r\n\r\nThe implementation is based on four sources:\r\n+ https://www.cs.ubc.ca/~schmidtm/Software/minFunc.html\r\n+ https://www.springer.com/gp/book/9780387303031\r\n+ https://github.com/torch/optim/blob/master/lswolfe.lua\r\n+ https://github.com/torch/optim/blob/master/polyinterp.lua\r\n\r\nThe 'lua' version is based on an old version of `minFunc`, which has been updated in 2012. I made a couple of small changes based on the updated version. Due to that, the test of comparing with `.lua` version is not consistent (that's is the reason I changed a learning rate in the 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