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fix add_n bug: when input mem overlap with output mem, results is wrong #14889

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merged 3 commits into from
May 7, 2019
Merged

fix add_n bug: when input mem overlap with output mem, results is wrong #14889

merged 3 commits into from
May 7, 2019

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rongzha1
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@rongzha1 rongzha1 commented May 6, 2019 •
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Description

Fix add_n forword bug
Due to "FInplaceOption" is active, output memory should not set_zero before actually do "add_n" which will make inputs memory set zero too when overlap.
Fix issue for #14858

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  • 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)
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  • To the my best knowledge, examples are either not affected by this change, or have been fixed to be compatible with this change

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

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

eric-haibin-lin
eric-haibin-lin reviewed May 6, 2019
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Nice catch! Would you mind adding an unit test to test_ndarray.py? e.g.

x = mx.nd.ones((2,2))
mx.nd.ElemwiseSum(x,x,out=x)

@rongzha1
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rongzha1 commented May 6, 2019

Nice catch! Would you mind adding an unit test to test_ndarray.py? e.g.

x = mx.nd.ones((2,2))
mx.nd.ElemwiseSum(x,x,out=x)

Thanks for your advice. Testcase has been added.

pengzhao-intel
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LGTM

@sandeep-krishnamurthy please take a review too.

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Thanks

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@mxnet-label-bot add [pr-awaiting-merge]

@marcoabreu marcoabreu added the pr-awaiting-merge Review and CI is complete. Ready to Merge label May 6, 2019
yuxihu
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Nice catch! LGTM!

TaoLv
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Minor comments.

src/ndarray/ndarray_function.cc Outdated
@@ -207,7 +207,10 @@ void ElementwiseSumContainsDnsImpl(mshadow::Stream<cpu>* s,
using namespace mxnet::op::mxnet_op;
const TBlob& out_data = out->data();
MSHADOW_TYPE_SWITCH(out->dtype(), DType, { // data type
Kernel<set_zero, cpu>::Launch(s, out_data.Size(), out_data.dptr<DType>());
// Do not set_zero if output mem inplace with input mem: elemwise_sum.cc FInplaceOption
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Make this comment easy to understand. Add comment that output can be in-placed with the first input.

tests/python/unittest/test_operator.py Outdated
@@ -8284,6 +8284,18 @@ def check_concat(shape1, shape2, axis):
check_concat((8, 0, 0), (8, 0, 0), 2)


@with_seed()
def test_elemwise_sum_add_n():
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test_add_n() ?

tests/python/unittest/test_operator.py Outdated
rslt = mx.nd.zeros(shape=data_shape)
for i in range(input_num):
rslt += data[i]
add_n_rslt = mx.nd.add_n(*data,out=data[0])
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add a space before out=data[0].

@pengzhao-intel pengzhao-intel merged commit 5bda980 into apache:master May 7, 2019
access2rohit pushed a commit to access2rohit/incubator-mxnet that referenced this pull request May 14, 2019
@rongzha1
fix add_n bug: when input mem overlap with output mem, results is wro…
a5f9312 
…ng (apache#14889)

* fix add_n bug: when input mem overlap with output mem, results is wrong

* add testcase for bugfix verification

* add more comments for modification and change testcase name to test_add_n
haohuanw pushed a commit to haohuanw/incubator-mxnet that referenced this pull request Jun 23, 2019
@rongzha1
fix add_n bug: when input mem overlap with output mem, results is wro…
bcee862 
…ng (apache#14889)

* fix add_n bug: when input mem overlap with output mem, results is wrong

* add testcase for bugfix verification

* add more comments for modification and change testcase name to test_add_n
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@yuxihu yuxihu yuxihu approved these changes

@sandeep-krishnamurthy sandeep-krishnamurthy sandeep-krishnamurthy approved these changes

@TaoLv TaoLv TaoLv approved these changes

@pengzhao-intel pengzhao-intel pengzhao-intel approved these changes

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