datum_to_fv_converter.combination_feature_string may fails

[kazuki]

I ran the test of jubatus-core 1.0.5 in the i686 (python manylinux1 environment), and the test failed as follows.

[ RUN      ] datum_to_fv_converter.combination_feature_string
../jubatus/core/fv_converter/datum_to_fv_converter_test.cpp:607: Failure                     
Value of: feature                 
  Actual: { ("name$xyz@space#bin/bin", 1), ("name$abc@space#bin/bin", 1), ("title$foo@space#bin/bin", 1), ("title$bar@space#bin/bin", 1), ("name$xyz@space#bin/bin&title$foo@space#bin/bin/add", 2), ("name$xyz@space#bin/bin&title$bar@space#bin/bin/add", 2), ("name$abc@space#bin/bin&tit
le$foo@space#bin/bin/add", 2), ("name$abc@space#bin/bin&title$bar@space#bin/bin/add", 2), ("title$foo@space#bin/bin&title$bar@space#bin/bin/mul", 1) }
Expected: expected                                                                           
Which is: { ("name$xyz@space#bin/bin", 1), ("name$abc@space#bin/bin", 1), ("title$bar@space#bin/bin", 1), ("title$foo@space#bin/bin", 1), ("name$xyz@space#bin/bin&title$bar@space#bin/bin/add", 2), ("name$xyz@space#bin/bin&title$foo@space#bin/bin/add", 2), ("name$abc@space#bin/bin&tit
le$bar@space#bin/bin/add", 2), ("name$abc@space#bin/bin&title$foo@space#bin/bin/add", 2), ("title$bar@space#bin/bin&title$foo@space#bin/bin/mul", 1) }

splitted token order is unstable because jubatus::core::fv_converter::counter uses unordered_map.

TravisCI fortuitously passed this test.

[kazuki]

Maybe, this issue causes model incompatibility between other architecture/stdc++impl.

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[stale[bot]]

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