{"action":"created","comment":{"url":"https://api.github.com/repos/odlgroup/odl/pulls/comments/75635000","id":75635000,"diff_hunk":"@@ -0,0 +1,218 @@\n+# Copyright 2014-2016 The ODL development group\n+#\n+# This file is part of ODL.\n+#\n+# ODL is free software: you can redistribute it and/or modify\n+# it under the terms of the GNU General Public License as published by\n+# the Free Software Foundation, either version 3 of the License, or\n+# (at your option) any later version.\n+#\n+# ODL is distributed in the hope that it will be useful,\n+# but WITHOUT ANY WARRANTY; without even the implied warranty of\n+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the\n+# GNU General Public License for more details.\n+#\n+# You should have received a copy of the GNU General Public License\n+# along with ODL.  If not, see <http://www.gnu.org/licenses/>.\n+\n+\"\"\"Unit tests for `discr_ops`.\"\"\"\n+\n+# Imports for common Python 2/3 codebase\n+from __future__ import print_function, division, absolute_import\n+from future import standard_library\n+standard_library.install_aliases()\n+\n+import pytest\n+import numpy as np\n+\n+import odl\n+from odl.discr.discr_ops import _SUPPORTED_RESIZE_PAD_MODES\n+from odl.util.testutils import almost_equal, example_element\n+\n+\n+# --- ResizingOperator --- #\n+\n+\n+def test_resizing_op_init():","path":"test/discr/discr_ops_test.py","position":36,"original_position":36,"commit_id":"b67607feef6f368f8ccac83f2b1eb6335e5137e8","original_commit_id":"b67607feef6f368f8ccac83f2b1eb6335e5137e8","user":{"login":"adler-j","id":2202312,"avatar_url":"https://avatars.githubusercontent.com/u/2202312?v=3","gravatar_id":"","url":"https://api.github.com/users/adler-j","html_url":"https://github.com/adler-j","followers_url":"https://api.github.com/users/adler-j/followers","following_url":"https://api.github.com/users/adler-j/following{/other_user}","gists_url":"https://api.github.com/users/adler-j/gists{/gist_id}","starred_url":"https://api.github.com/users/adler-j/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/adler-j/subscriptions","organizations_url":"https://api.github.com/users/adler-j/orgs","repos_url":"https://api.github.com/users/adler-j/repos","events_url":"https://api.github.com/users/adler-j/events{/privacy}","received_events_url":"https://api.github.com/users/adler-j/received_events","type":"User","site_admin":false},"body":"Also may want to consider storage order.","created_at":"2016-08-22T08:24:41Z","updated_at":"2016-08-22T08:24:41Z","html_url":"https://github.com/odlgroup/odl/pull/499#discussion_r75635000","pull_request_url":"https://api.github.com/repos/odlgroup/odl/pulls/499","_links":{"self":{"href":"https://api.github.com/repos/odlgroup/odl/pulls/comments/75635000"},"html":{"href":"https://github.com/odlgroup/odl/pull/499#discussion_r75635000"},"pull_request":{"href":"https://api.github.com/repos/odlgroup/odl/pulls/499"}}},"pull_request":{"url":"https://api.github.com/repos/odlgroup/odl/pulls/499","id":78038725,"html_url":"https://github.com/odlgroup/odl/pull/499","diff_url":"https://github.com/odlgroup/odl/pull/499.diff","patch_url":"https://github.com/odlgroup/odl/pull/499.patch","issue_url":"https://api.github.com/repos/odlgroup/odl/issues/499","number":499,"state":"open","locked":false,"title":"Issue 411  padding","user":{"login":"kohr-h","id":5030250,"avatar_url":"https://avatars.githubusercontent.com/u/5030250?v=3","gravatar_id":"","url":"https://api.github.com/users/kohr-h","html_url":"https://github.com/kohr-h","followers_url":"https://api.github.com/users/kohr-h/followers","following_url":"https://api.github.com/users/kohr-h/following{/other_user}","gists_url":"https://api.github.com/users/kohr-h/gists{/gist_id}","starred_url":"https://api.github.com/users/kohr-h/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/kohr-h/subscriptions","organizations_url":"https://api.github.com/users/kohr-h/orgs","repos_url":"https://api.github.com/users/kohr-h/repos","events_url":"https://api.github.com/users/kohr-h/events{/privacy}","received_events_url":"https://api.github.com/users/kohr-h/received_events","type":"User","site_admin":false},"body":"Implements the resizing of a multi-dimensional array as an operator wrapping a helper function `resize_array` which will be very helpful in itself.\r\n\r\nBasically, resizing means keeping the cell sizes and changing the number of cells per axis, plus a shift by a multiple of the cell size.\r\n\r\nThe extension (padding) is supported in 5 different versions: constant (i.e. fill with a constant), periodic, symmetric, order 0 (continue constantly) and order 1 (continue with constant slope). Not sure we need all of those, but was not too hard to add once the infrastructure was there.\r\n\r\n~~What's missing currently is the adjoint. It's not super simple and needs some thought to get it right. I'd suggest we deal with it in a separate issue.~~\r\n\r\nTODO:\r\n- [x] Refactor code so forward and adjoint use as much common code as possible (basically the slice calculations)\r\n- [x] More tests, especially corner cases and adjoint\r\n- [x] Doc improvements\r\n- [x] Decision on how to specify start position / distribution of cropped stuff between the left and right sides of the array. I went for `offset` ~~Currently implemented:~~\r\n  * ~~`num_left` -- how many cells added/removed on the left side~~\r\n  * ~~`frac_left` -- same as above, but as fraction. Less reliable due to rounding. Will be removed.~~\r\n  \r\n   ~~Questions: Do we need a `num_right` counterpart? Do we need another option to specify the amount?~~\r\n\r\nEdit: last point 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