{"action":"created","comment":{"url":"https://api.github.com/repos/apache/incubator-mxnet/pulls/comments/223171065","pull_request_review_id":162243962,"id":223171065,"node_id":"MDI0OlB1bGxSZXF1ZXN0UmV2aWV3Q29tbWVudDIyMzE3MTA2NQ==","diff_hunk":"@@ -4619,6 +4647,85 @@ def check_ctc_loss_grad(blank_label): # from tf\n         label_lens = np.array([5, 4], dtype=np.int32)\n         loss_truth = np.array([-loss_log_prob_0, -loss_log_prob_1], np.float32)\n \n+        with default_context():\n+            data = mx.nd.array(inputs)\n+            label = mx.nd.array(labels)\n+            data.attach_grad()\n+            with mx.autograd.record():\n+                l = mx.ndarray.CTCLoss(data, label,\n+                                       use_data_lengths=True,\n+                                       use_label_lengths=True,\n+                                       data_lengths=mx.nd.array(seq_lens),\n+                                       label_lengths=mx.nd.array(label_lens),\n+                                       blank_label=blank_label)\n+                l.backward()\n+            assert_almost_equal(l.asnumpy(), loss_truth, atol=1e-5, rtol=1e-5)\n+            assert_almost_equal(data.grad.asnumpy(), grad_truth, atol=1e-5, rtol=1e-5)\n+\n+    # check contrib operator for backward compatibility\n+    def check_contrib_ctc_loss_grad(blank_label): # from tf\n+        vocab_size = 5\n+        max_label_len = 5\n+        padding_mask = -1+ (blank_label=='first')\n+\n+        targets_0 = [0, 1, 2, 1, 0]\n+        loss_log_prob_0 = -3.34211\n+        input_prob_matrix_0 = np.asarray(\n+            [[0.633766, 0.221185, 0.0917319, 0.0129757, 0.0142857, 0.0260553],\n+             [0.111121, 0.588392, 0.278779, 0.0055756, 0.00569609, 0.010436],\n+             [0.0357786, 0.633813, 0.321418, 0.00249248, 0.00272882, 0.0037688],\n+             [0.0663296, 0.643849, 0.280111, 0.00283995, 0.0035545, 0.00331533],\n+             [0.458235, 0.396634, 0.123377, 0.00648837, 0.00903441, 0.00623107]],","path":"tests/python/unittest/test_operator.py","position":108,"original_position":108,"commit_id":"1f09bf85c85d31d084a93bd136542a164d02ca98","original_commit_id":"1f09bf85c85d31d084a93bd136542a164d02ca98","user":{"login":"apeforest","id":6807113,"node_id":"MDQ6VXNlcjY4MDcxMTM=","avatar_url":"https://avatars0.githubusercontent.com/u/6807113?v=4","gravatar_id":"","url":"https://api.github.com/users/apeforest","html_url":"https://github.com/apeforest","followers_url":"https://api.github.com/users/apeforest/followers","following_url":"https://api.github.com/users/apeforest/following{/other_user}","gists_url":"https://api.github.com/users/apeforest/gists{/gist_id}","starred_url":"https://api.github.com/users/apeforest/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/apeforest/subscriptions","organizations_url":"https://api.github.com/users/apeforest/orgs","repos_url":"https://api.github.com/users/apeforest/repos","events_url":"https://api.github.com/users/apeforest/events{/privacy}","received_events_url":"https://api.github.com/users/apeforest/received_events","type":"User","site_admin":false},"body":"What do you mean python library? I could not find any standard python library with this loss function except other third-party frameworks.","created_at":"2018-10-06T04:18:06Z","updated_at":"2018-10-06T04:18:06Z","html_url":"https://github.com/apache/incubator-mxnet/pull/12637#discussion_r223171065","pull_request_url":"https://api.github.com/repos/apache/incubator-mxnet/pulls/12637","author_association":"CONTRIBUTOR","_links":{"self":{"href":"https://api.github.com/repos/apache/incubator-mxnet/pulls/comments/223171065"},"html":{"href":"https://github.com/apache/incubator-mxnet/pull/12637#discussion_r223171065"},"pull_request":{"href":"https://api.github.com/repos/apache/incubator-mxnet/pulls/12637"}},"in_reply_to_id":223151943},"pull_request":{"url":"https://api.github.com/repos/apache/incubator-mxnet/pulls/12637","id":217421113,"node_id":"MDExOlB1bGxSZXF1ZXN0MjE3NDIxMTEz","html_url":"https://github.com/apache/incubator-mxnet/pull/12637","diff_url":"https://github.com/apache/incubator-mxnet/pull/12637.diff","patch_url":"https://github.com/apache/incubator-mxnet/pull/12637.patch","issue_url":"https://api.github.com/repos/apache/incubator-mxnet/issues/12637","number":12637,"state":"open","locked":false,"title":"[MXNET-912] Refactoring ctc loss operator","user":{"login":"apeforest","id":6807113,"node_id":"MDQ6VXNlcjY4MDcxMTM=","avatar_url":"https://avatars0.githubusercontent.com/u/6807113?v=4","gravatar_id":"","url":"https://api.github.com/users/apeforest","html_url":"https://github.com/apeforest","followers_url":"https://api.github.com/users/apeforest/followers","following_url":"https://api.github.com/users/apeforest/following{/other_user}","gists_url":"https://api.github.com/users/apeforest/gists{/gist_id}","starred_url":"https://api.github.com/users/apeforest/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/apeforest/subscriptions","organizations_url":"https://api.github.com/users/apeforest/orgs","repos_url":"https://api.github.com/users/apeforest/repos","events_url":"https://api.github.com/users/apeforest/events{/privacy}","received_events_url":"https://api.github.com/users/apeforest/received_events","type":"User","site_admin":false},"body":"## Description ##\r\nThe ctc_loss operator is widely used and has been stable in the past a few releases. This PR is to move this operator from contrib to MXNet regular and refactored the implementation using the new operator interface. \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## Comments ##\r\n- Refactoring\r\n- Updated unit test from mx.contrib.ctc_loss to mx.ctc_loss","created_at":"2018-09-21T23:08:39Z","updated_at":"2018-10-06T04:18:06Z","closed_at":null,"merged_at":null,"merge_commit_sha":"ac12885843ef32bcaa2af1100277a13ffe209fe7","assignee":null,"assignees":[],"requested_reviewers":[{"login":"anirudh2290","id":1522319,"node_id":"MDQ6VXNlcjE1MjIzMTk=","avatar_url":"https://avatars1.githubusercontent.com/u/1522319?v=4","gravatar_id":"","url":"https://api.github.com/users/anirudh2290","html_url":"https://github.com/anirudh2290","followers_url":"https://api.github.com/users/anirudh2290/followers","following_url":"https://api.github.com/users/anirudh2290/following{/other_user}","gists_url":"https://api.github.com/users/anirudh2290/gists{/gist_id}","starred_url":"https://api.github.com/users/anirudh2290/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/anirudh2290/subscriptions","organizations_url":"https://api.github.com/users/anirudh2290/orgs","repos_url":"https://api.github.com/users/anirudh2290/repos","events_url":"https://api.github.com/users/anirudh2290/events{/privacy}","received_events_url":"https://api.github.com/users/anirudh2290/received_events","type":"User","site_admin":false},{"login":"szha","id":2626883,"node_id":"MDQ6VXNlcjI2MjY4ODM=","avatar_url":"https://avatars2.githubusercontent.com/u/2626883?v=4","gravatar_id":"","url":"https://api.github.com/users/szha","html_url":"https://github.com/szha","followers_url":"https://api.github.com/users/szha/followers","following_url":"https://api.github.com/users/szha/following{/other_user}","gists_url":"https://api.github.com/users/szha/gists{/gist_id}","starred_url":"https://api.github.com/users/szha/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/szha/subscriptions","organizations_url":"https://api.github.com/users/szha/orgs","repos_url":"https://api.github.com/users/szha/repos","events_url":"https://api.github.com/users/szha/events{/privacy}","received_events_url":"https://api.github.com/users/szha/received_events","type":"User","site_admin":false}],"requested_teams":[],"labels":[{"id":1018798522,"node_id":"MDU6TGFiZWwxMDE4Nzk4NTIy","url":"https://api.github.com/repos/apache/incubator-mxnet/labels/pr-awaiting-review","name":"pr-awaiting-review","color":"d93f0b","default":false}],"milestone":null,"commits_url":"https://api.github.com/repos/apache/incubator-mxnet/pulls/12637/commits","review_comments_url":"https://api.github.com/repos/apache/incubator-mxnet/pulls/12637/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/12637/comments","statuses_url":"https://api.github.com/repos/apache/incubator-mxnet/statuses/1f09bf85c85d31d084a93bd136542a164d02ca98","head":{"label":"apeforest:refactor/ctc_loss_operator","ref":"refactor/ctc_loss_operator","sha":"1f09bf85c85d31d084a93bd136542a164d02ca98","user":{"login":"apeforest","id":6807113,"node_id":"MDQ6VXNlcjY4MDcxMTM=","avatar_url":"https://avatars0.githubusercontent.com/u/6807113?v=4","gravatar_id":"","url":"https://api.github.com/users/apeforest","html_url":"https://github.com/apeforest","followers_url":"https://api.github.com/users/apeforest/followers","following_url":"https://api.github.com/users/apeforest/following{/other_user}","gists_url":"https://api.github.com/users/apeforest/gists{/gist_id}","starred_url":"https://api.github.com/users/apeforest/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/apeforest/subscriptions","organizations_url":"https://api.github.com/users/apeforest/orgs","repos_url":"https://api.github.com/users/apeforest/repos","events_url":"https://api.github.com/users/apeforest/events{/privacy}","received_events_url":"https://api.github.com/users/apeforest/received_events","type":"User","site_admin":false},"repo":{"id":137406452,"node_id":"MDEwOlJlcG9zaXRvcnkxMzc0MDY0NTI=","name":"incubator-mxnet","full_name":"apeforest/incubator-mxnet","private":false,"owner":{"login":"apeforest","id":6807113,"node_id":"MDQ6VXNlcjY4MDcxMTM=","avatar_url":"https://avatars0.githubusercontent.com/u/6807113?v=4","gravatar_id":"","url":"https://api.github.com/users/apeforest","html_url":"https://github.com/apeforest","followers_url":"https://api.github.com/users/apeforest/followers","following_url":"https://api.github.com/users/apeforest/following{/other_user}","gists_url":"https://api.github.com/users/apeforest/gists{/gist_id}","starred_url":"https://api.github.com/users/apeforest/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/apeforest/subscriptions","organizations_url":"https://api.github.com/users/apeforest/orgs","repos_url":"https://api.github.com/users/apeforest/repos","events_url":"https://api.github.com/users/apeforest/events{/privacy}","received_events_url":"https://api.github.com/users/apeforest/received_events","type":"User","site_admin":false},"html_url":"https://github.com/apeforest/incubator-mxnet","description":"Lig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