[incubator-singa] branch master updated (d94ba5d -> 5af541f)

[wa...@apache.org]

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wangwei pushed a change to branch master
in repository https://gitbox.apache.org/repos/asf/incubator-singa.git.


    from d94ba5d  Merge pull request #492 from ShichengChen/dev
     new c46d347  add Sub operator
     new b8ea58a  resolve conflict
     new 8181f06  add backward test
     new f71db17  fix backward test code
     new fd5fb7f  tidy up code eval_numerical_gradient_b()
     new ab37ecd  fix backward test code
     new 5af541f  Merge pull request #485 from pinpom/sub

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Summary of changes:
 python/singa/autograd.py      | 18 ++++++++++++++++
 test/python/test_operation.py | 50 +++++++++++++++++++++++++++++++++++++++++--
 2 files changed, 66 insertions(+), 2 deletions(-)