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Properly handling custom op exception by modify engine #14693

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merged 6 commits into from
Apr 16, 2019
Merged

Properly handling custom op exception by modify engine #14693

merged 6 commits into from
Apr 16, 2019

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arcadiaphy
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Description

In #14522, problems of custom op exception handling are reported. #14575 tries to fix them by modify custom op implementation, which causes blocking in custom thread.

This PR tries to address the issue by modifying engine:

  1. Add kNoSkip operation to force execution even with associated exception
  2. Since NDArray is duplicated in custom op with shared data, their exception status may not be synchronized, so Throw method is added in engine to re-throw associated exception on var.
  3. Users are free to use sync operation like asnumpy or wait_to_read in custom op to block custom thread, so unlimited number of threads are still needed to avoid deadlock.

Checklist

Essentials

Please feel free to remove inapplicable items for your PR.

  • The PR title starts with [MXNET-$JIRA_ID], where $JIRA_ID refers to the relevant JIRA issue created (except PRs with tiny changes)
  • Changes are complete (i.e. I finished coding on this PR)
  • All changes have test coverage:
  • Unit tests are added for small changes to verify correctness (e.g. adding a new operator)
  • Nightly tests are added for complicated/long-running ones (e.g. changing distributed kvstore)
  • Build tests will be added for build configuration changes (e.g. adding a new build option with NCCL)
  • Code is well-documented:
  • For user-facing API changes, API doc string has been updated.
  • For new C++ functions in header files, their functionalities and arguments are documented.
  • For new examples, README.md is added to explain the what the example does, the source of the dataset, expected performance on test set and reference to the original paper if applicable
  • Check the API doc at http://mxnet-ci-doc.s3-accelerate.dualstack.amazonaws.com/PR-$PR_ID/$BUILD_ID/index.html
  • To the my best knowledge, examples are either not affected by this change, or have been fixed to be compatible with this change

Changes

  • Feature1, tests, (and when applicable, API doc)
  • Feature2, tests, (and when applicable, API doc)

Comments

  • If this change is a backward incompatible change, why must this change be made.
  • Interesting edge cases to note here

@arcadiaphy arcadiaphy requested a review from szha as a code owner April 14, 2019 03:48
@szha
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szha commented Apr 14, 2019

@junrushao1994 could you take a look too?

wkcn
wkcn approved these changes Apr 15, 2019
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LGTM. Thank you for the fix!

anirudh2290
anirudh2290 reviewed Apr 15, 2019
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Thanks for the nice work ! Added a comment for tests, otherwise LGTM.

src/operator/custom/custom-inl.h Show resolved Hide resolved
tests/python/unittest/test_operator.py Show resolved Hide resolved
junrushao
junrushao approved these changes Apr 15, 2019
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LGTM

@nswamy nswamy added Exception Handling pr-work-in-progress PR is still work in progress labels Apr 15, 2019
@arcadiaphy
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irrelevant flaky test in julia:
http://jenkins.mxnet-ci.amazon-ml.com/blue/organizations/jenkins/mxnet-validation%2Funix-cpu/detail/PR-14693/4/pipeline

@arcadiaphy arcadiaphy merged commit 1f84682 into apache:master Apr 16, 2019
@arcadiaphy arcadiaphy deleted the pr_engine_async branch April 16, 2019 08:06
@arcadiaphy arcadiaphy mentioned this pull request Apr 16, 2019
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kedarbellare pushed a commit to kedarbellare/incubator-mxnet that referenced this pull request Apr 20, 2019
@arcadiaphy @kedarbellare
Properly handling custom op exception by modify engine (apache#14693)
af9f6b7 
* fix custom except handling by modify engine

* add test

* fix lint

* update test

* fix test

* trigger CI
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TaoLv commented Apr 25, 2019

@arcadiaphy Can you take a look at this failure? http://jenkins.mxnet-ci.amazon-ml.com/blue/organizations/jenkins/mxnet-validation%2Funix-cpu/detail/PR-14783/3/pipeline#step-676-log-1586

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@TaoLv Sure, let me have a look.

haohuanw pushed a commit to haohuanw/incubator-mxnet that referenced this pull request Jun 23, 2019
@arcadiaphy
Properly handling custom op exception by modify engine (apache#14693)
b7812d3 
* fix custom except handling by modify engine

* add test

* fix lint

* update test

* fix test

* trigger CI
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@anirudh2290 anirudh2290 anirudh2290 approved these changes

@wkcn wkcn wkcn approved these changes

@junrushao junrushao junrushao approved these changes

@szha szha Awaiting requested review from szha szha is a code owner

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@arcadiaphy @szha @TaoLv @anirudh2290 @wkcn @junrushao @nswamy