{"action":"created","comment":{"url":"https://api.github.com/repos/apache/incubator-mxnet/pulls/comments/189138583","pull_request_review_id":121260797,"id":189138583,"diff_hunk":"@@ -0,0 +1,586 @@\n+/*\n+ * Licensed to the Apache Software Foundation (ASF) under one\n+ * or more contributor license agreements.  See the NOTICE file\n+ * distributed with this work for additional information\n+ * regarding copyright ownership.  The ASF licenses this file\n+ * to you under the Apache License, Version 2.0 (the\n+ * \"License\"); you may not use this file except in compliance\n+ * with the License.  You may obtain a copy of the License at\n+ *\n+ *   http://www.apache.org/licenses/LICENSE-2.0\n+ *\n+ * Unless required by applicable law or agreed to in writing,\n+ * software distributed under the License is distributed on an\n+ * \"AS IS\" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY\n+ * KIND, either express or implied.  See the License for the\n+ * specific language governing permissions and limitations\n+ * under the License.\n+ */\n+/*!\n+ * Copyright (c) 2018 by Contributors\n+ * \\file roi_align.cc\n+ * \\brief roi align operator\n+ * \\author Hang Zhang\n+ * Adapted from Caffe2\n+*/\n+#include \"./roi_align-inl.h\"\n+\n+\n+namespace mxnet {\n+namespace op {\n+\n+template <typename T>\n+struct PreCalc {\n+  int pos1;\n+  int pos2;\n+  int pos3;\n+  int pos4;\n+  T w1;\n+  T w2;\n+  T w3;\n+  T w4;\n+};\n+\n+template <typename T>\n+void pre_calc_for_bilinear_interpolate(\n+    const int height,\n+    const int width,\n+    const int pooled_height,\n+    const int pooled_width,\n+    const int iy_upper,\n+    const int ix_upper,\n+    T roi_start_h,\n+    T roi_start_w,\n+    T bin_size_h,\n+    T bin_size_w,\n+    int roi_bin_grid_h,\n+    int roi_bin_grid_w,\n+    std::vector<PreCalc<T>>* pre_calc) {\n+  int pre_calc_index = 0;\n+  for (int ph = 0; ph < pooled_height; ph++) {\n+    for (int pw = 0; pw < pooled_width; pw++) {\n+      for (int iy = 0; iy < iy_upper; iy++) {\n+        const T yy = roi_start_h + ph * bin_size_h +\n+            static_cast<T>(iy + .5f) * bin_size_h /\n+                static_cast<T>(roi_bin_grid_h);  // e.g., 0.5, 1.5\n+        for (int ix = 0; ix < ix_upper; ix++) {\n+          const T xx = roi_start_w + pw * bin_size_w +\n+              static_cast<T>(ix + .5f) * bin_size_w /\n+                  static_cast<T>(roi_bin_grid_w);\n+\n+          T x = xx;\n+          T y = yy;\n+          // deal with: inverse elements are out of feature map boundary\n+          if (y < -1.0 || y > height || x < -1.0 || x > width) {\n+            // empty\n+            PreCalc<T> pc;\n+            pc.pos1 = 0;\n+            pc.pos2 = 0;\n+            pc.pos3 = 0;\n+            pc.pos4 = 0;\n+            pc.w1 = 0;\n+            pc.w2 = 0;\n+            pc.w3 = 0;\n+            pc.w4 = 0;\n+            pre_calc->at(pre_calc_index) = pc;\n+            pre_calc_index += 1;\n+            continue;\n+          }\n+\n+          if (y <= 0) {\n+            y = 0;\n+          }\n+          if (x <= 0) {\n+            x = 0;\n+          }\n+\n+          int y_low = static_cast<int>(y);\n+          int x_low = static_cast<int>(x);\n+          int y_high;\n+          int x_high;\n+\n+          if (y_low >= height - 1) {\n+            y_high = y_low = height - 1;\n+            y = (T)y_low;\n+          } else {\n+            y_high = y_low + 1;\n+          }\n+\n+          if (x_low >= width - 1) {\n+            x_high = x_low = width - 1;\n+            x = (T)x_low;\n+          } else {\n+            x_high = x_low + 1;\n+          }\n+\n+          T ly = y - y_low;\n+          T lx = x - x_low;\n+          T hy = 1. - ly, hx = 1. - lx;\n+          T w1 = hy * hx, w2 = hy * lx, w3 = ly * hx, w4 = ly * lx;\n+\n+          // save weights and indeces\n+          PreCalc<T> pc;\n+          pc.pos1 = y_low * width + x_low;\n+          pc.pos2 = y_low * width + x_high;\n+          pc.pos3 = y_high * width + x_low;\n+          pc.pos4 = y_high * width + x_high;\n+          pc.w1 = w1;\n+          pc.w2 = w2;\n+          pc.w3 = w3;\n+          pc.w4 = w4;\n+          pre_calc->at(pre_calc_index) = pc;\n+\n+          pre_calc_index += 1;\n+        }\n+      }\n+    }\n+  }\n+}\n+\n+template <typename T>\n+void ROIAlignForward(\n+    const int nthreads,\n+    const T* bottom_data,\n+    const T& spatial_scale,\n+    const int channels,\n+    const int height,\n+    const int width,\n+    const int pooled_height,\n+    const int pooled_width,\n+    const int sampling_ratio,\n+    const T* bottom_rois,\n+    int roi_cols,\n+    T* top_data) {\n+  DCHECK(roi_cols == 4 || roi_cols == 5);\n+\n+  int n_rois = nthreads / channels / pooled_width / pooled_height;\n+  // (n, c, ph, pw) is an element in the pooled output\n+  // can be parallelized using omp\n+  int n;\n+#pragma omp parallel for private(n) \\","path":"src/operator/contrib/roi_align.cc","position":160,"original_position":160,"commit_id":"787c694040c7091e62c0a7f07f737416c099decc","original_commit_id":"787c694040c7091e62c0a7f07f737416c099decc","user":{"login":"zhanghang1989","id":8041160,"avatar_url":"https://avatars1.githubusercontent.com/u/8041160?v=4","gravatar_id":"","url":"https://api.github.com/users/zhanghang1989","html_url":"https://github.com/zhanghang1989","followers_url":"https://api.github.com/users/zhanghang1989/followers","following_url":"https://api.github.com/users/zhanghang1989/following{/other_user}","gists_url":"https://api.github.com/users/zhanghang1989/gists{/gist_id}","starred_url":"https://api.github.com/users/zhanghang1989/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/zhanghang1989/subscriptions","organizations_url":"https://api.github.com/users/zhanghang1989/orgs","repos_url":"https://api.github.com/users/zhanghang1989/repos","events_url":"https://api.github.com/users/zhanghang1989/events{/privacy}","received_events_url":"https://api.github.com/users/zhanghang1989/received_events","type":"User","site_admin":false},"body":"Are you suggesting removing this omp?","created_at":"2018-05-18T00:41:49Z","updated_at":"2018-05-18T00:41:49Z","html_url":"https://github.com/apache/incubator-mxnet/pull/10852#discussion_r189138583","pull_request_url":"https://api.github.com/repos/apache/incubator-mxnet/pulls/10852","author_association":"CONTRIBUTOR","_links":{"self":{"href":"https://api.github.com/repos/apache/incubator-mxnet/pulls/comments/189138583"},"html":{"href":"https://github.com/apache/incubator-mxnet/pull/10852#discussion_r189138583"},"pull_request":{"href":"https://api.github.com/repos/apache/incubator-mxnet/pulls/10852"}},"in_reply_to_id":189134301},"pull_request":{"url":"https://api.github.com/repos/apache/incubator-mxnet/pulls/10852","id":186692034,"html_url":"https://github.com/apache/incubator-mxnet/pull/10852","diff_url":"https://github.com/apache/incubator-mxnet/pull/10852.diff","patch_url":"https://github.com/apache/incubator-mxnet/pull/10852.patch","issue_url":"https://api.github.com/repos/apache/incubator-mxnet/issues/10852","number":10852,"state":"open","locked":false,"title":"[MXNET-411] Add ROI Align","user":{"login":"zhanghang1989","id":8041160,"avatar_url":"https://avatars1.githubusercontent.com/u/8041160?v=4","gravatar_id":"","url":"https://api.github.com/users/zhanghang1989","html_url":"https://github.com/zhanghang1989","followers_url":"https://api.github.com/users/zhanghang1989/followers","following_url":"https://api.github.com/users/zhanghang1989/following{/other_user}","gists_url":"https://api.github.com/users/zhanghang1989/gists{/gist_id}","starred_url":"https://api.github.com/users/zhanghang1989/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/zhanghang1989/subscriptions","organizations_url":"https://api.github.com/users/zhanghang1989/orgs","repos_url":"https://api.github.com/users/zhanghang1989/repos","events_url":"https://api.github.com/users/zhanghang1989/events{/privacy}","received_events_url":"https://api.github.com/users/zhanghang1989/received_events","type":"User","site_admin":false},"body":"## Description ##\r\n(Brief description on what this PR is about)\r\n\r\n## Checklist ##\r\n### Essentials ###\r\nPlease feel free to remove inapplicable items for your PR.\r\n- [x] The PR title starts with [MXNET-$JIRA_ID], where $JIRA_ID refers to the relevant [JIRA issue](https://issues.apache.org/jira/projects/MXNET/issues) created (except PRs with tiny changes)\r\n- [x] Changes are complete (i.e. I finished coding on this PR)\r\n- [x] All changes have test coverage:\r\n- Unit tests are added for small changes to verify correctness (e.g. adding a new operator)\r\n- Nightly tests are added for complicated/long-running ones (e.g. changing distributed kvstore)\r\n- Build tests will be added for build configuration changes (e.g. adding a new build option with NCCL)\r\n- [x] Code is well-documented: \r\n- For user-facing API changes, API doc string has been updated. \r\n- For new C++ functions in header files, their functionalities and arguments are documented. \r\n- For new examples, README.md is added to explain the what the example does, the source of the dataset, expected performance on test set and reference to the original paper if applicable\r\n- Check the API doc at http://mxnet-ci-doc.s3-accelerate.dualstack.amazonaws.com/PR-$PR_ID/$BUILD_ID/index.html\r\n- [x] To the my best knowledge, examples are either not affected by this change, or have been fixed to be compatible with this change\r\n\r\n### Changes ###\r\n- [x] ROI Align from Caffe2\r\n- [x] docs and unit test\r\n\r\n## Comments ##\r\n- If this change is a backward incompatible change, why must this change be made.\r\n- Interesting edge cases to note here\r\n","created_at":"2018-05-08T16:42:37Z","updated_at":"2018-05-18T00:41:49Z","closed_at":null,"merged_at":null,"merge_commit_sha":"d94ef054062782bacec7a5d23d716ba18e6b01be","assignee":null,"assignees":[],"requested_reviewers":[],"requested_teams":[],"labels":[],"milestone":null,"commits_url":"https://api.github.com/repos/apache/incubator-mxnet/pulls/10852/commits","review_comments_url":"https://api.github.com/repos/apache/incubator-mxnet/pulls/10852/comments","review_comment_url":"https://api.github.com/repos/apache/incubator-mxnet/pulls/comments{/number}","comments_url":"https://api.github.com/repos/apache/incubator-mxnet/issues/10852/comments","statuses_url":"https://api.github.com/repos/apache/incubator-mxnet/statuses/787c694040c7091e62c0a7f07f737416c099decc","head":{"label":"zhanghang1989:roi","ref":"roi","sha":"787c694040c7091e62c0a7f07f737416c099decc","user":{"login":"zhanghang1989","id":8041160,"avatar_url":"https://avatars1.githubusercontent.com/u/8041160?v=4","gravatar_id":"","url":"https://api.github.com/users/zhanghang1989","html_url":"https://github.com/zhanghang1989","followers_url":"https://api.github.com/users/zhanghang1989/followers","following_url":"https://api.github.com/users/zhanghang1989/following{/other_user}","gists_url":"https://api.github.com/users/zhanghang1989/gists{/gist_id}","starred_url":"https://api.github.com/users/zhanghang1989/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/zhanghang1989/subscriptions","organizations_url":"https://api.github.com/users/zhanghang1989/orgs","repos_url":"https://api.github.com/users/zhanghang1989/repos","events_url":"https://api.github.com/users/zhanghang1989/events{/privacy}","received_events_url":"https://api.github.com/users/zhanghang1989/received_events","type":"User","site_admin":false},"repo":{"id":103984815,"name":"incubator-mxnet","full_name":"zhanghang1989/incubator-mxnet","owner":{"login":"zhanghang1989","id":8041160,"avatar_url":"https://avatars1.githubusercontent.com/u/8041160?v=4","gravatar_id":"","url":"https://api.github.com/users/zhanghang1989","html_url":"https://github.com/zhanghang1989","followers_url":"https://api.github.com/users/zhanghang1989/followers","following_url":"https://api.github.com/users/zhanghang1989/following{/other_user}","gists_url":"https://api.github.com/users/zhanghang1989/gists{/gist_id}","starred_url":"https://api.github.com/users/zhanghang1989/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/zhanghang1989/subscriptions","organizations_url":"https://api.github.com/users/zhanghang1989/orgs","repos_url":"https://api.github.com/users/zhanghang1989/repos","events_url":"https://api.github.com/users/zhanghang1989/events{/privacy}","received_events_url":"https://api.github.com/users/zhanghang1989/received_events","type":"User","site_admin":false},"private":false,"html_url":"https://github.com/zhanghang1989/incubator-mxnet","description":"Lightweight, 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