{"action":"created","comment":{"url":"https://api.github.com/repos/LLNL/smoothG/pulls/comments/171036582","pull_request_review_id":99819134,"id":171036582,"diff_hunk":"@@ -0,0 +1,180 @@\n+/*BHEADER**********************************************************************\n+ *\n+ * Copyright (c) 2018, Lawrence Livermore National Security, LLC.\n+ * Produced at the Lawrence Livermore National Laboratory.\n+ * LLNL-CODE-745247. All Rights reserved. See file COPYRIGHT for details.\n+ *\n+ * This file is part of smoothG. For more information and source code\n+ * availability, see https://www.github.com/llnl/smoothG.\n+ *\n+ * smoothG is free software; you can redistribute it and/or modify it under the\n+ * terms of the GNU Lesser General Public License (as published by the Free\n+ * Software Foundation) version 2.1 dated February 1999.\n+ *\n+ ***********************************************************************EHEADER*/\n+\n+/**\n+   @file finitevolume.cpp","path":"testcode/mltopo.cpp","position":17,"original_position":17,"commit_id":"29b850cc04ebae8d80a9a7336e4f717169933128","original_commit_id":"29b850cc04ebae8d80a9a7336e4f717169933128","user":{"login":"chakshinglee","id":18635640,"avatar_url":"https://avatars0.githubusercontent.com/u/18635640?v=4","gravatar_id":"","url":"https://api.github.com/users/chakshinglee","html_url":"https://github.com/chakshinglee","followers_url":"https://api.github.com/users/chakshinglee/followers","following_url":"https://api.github.com/users/chakshinglee/following{/other_user}","gists_url":"https://api.github.com/users/chakshinglee/gists{/gist_id}","starred_url":"https://api.github.com/users/chakshinglee/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/chakshinglee/subscriptions","organizations_url":"https://api.github.com/users/chakshinglee/orgs","repos_url":"https://api.github.com/users/chakshinglee/repos","events_url":"https://api.github.com/users/chakshinglee/events{/privacy}","received_events_url":"https://api.github.com/users/chakshinglee/received_events","type":"User","site_admin":false},"body":"good catch, I will fix it","created_at":"2018-02-27T19:19:55Z","updated_at":"2018-02-27T19:19:55Z","html_url":"https://github.com/LLNL/smoothG/pull/12#discussion_r171036582","pull_request_url":"https://api.github.com/repos/LLNL/smoothG/pulls/12","author_association":"MEMBER","_links":{"self":{"href":"https://api.github.com/repos/LLNL/smoothG/pulls/comments/171036582"},"html":{"href":"https://github.com/LLNL/smoothG/pull/12#discussion_r171036582"},"pull_request":{"href":"https://api.github.com/repos/LLNL/smoothG/pulls/12"}},"in_reply_to_id":170981020},"pull_request":{"url":"https://api.github.com/repos/LLNL/smoothG/pulls/12","id":170842548,"html_url":"https://github.com/LLNL/smoothG/pull/12","diff_url":"https://github.com/LLNL/smoothG/pull/12.diff","patch_url":"https://github.com/LLNL/smoothG/pull/12.patch","issue_url":"https://api.github.com/repos/LLNL/smoothG/issues/12","number":12,"state":"open","locked":false,"title":"Multilevel graph topology","user":{"login":"chakshinglee","id":18635640,"avatar_url":"https://avatars0.githubusercontent.com/u/18635640?v=4","gravatar_id":"","url":"https://api.github.com/users/chakshinglee","html_url":"https://github.com/chakshinglee","followers_url":"https://api.github.com/users/chakshinglee/followers","following_url":"https://api.github.com/users/chakshinglee/following{/other_user}","gists_url":"https://api.github.com/users/chakshinglee/gists{/gist_id}","starred_url":"https://api.github.com/users/chakshinglee/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/chakshinglee/subscriptions","organizations_url":"https://api.github.com/users/chakshinglee/orgs","repos_url":"https://api.github.com/users/chakshinglee/repos","events_url":"https://api.github.com/users/chakshinglee/events{/privacy}","received_events_url":"https://api.github.com/users/chakshinglee/received_events","type":"User","site_admin":false},"body":"This PR adds the feature of constructing multilevel graph topology. The idea should be straight forward (since originally we have a coarse level graph in a two level setting, which is `Agg_face`, and we just coarsen the coarse graph one more time, and the process continues until the number of requested levels is reached).\r\n\r\nThe way I do it is to add a constructor that takes a `GraphTopology` object as input. I think an alternative way is to make a `Coarsen` member function and return the coarsened `GraphTopology` object. We can  do the latter if we think that's 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