fix some bugs when using in multithread#32

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yangzhg wants to merge 1 commit intoAIworx-Labs:masterfrom yangzhg:master

+18-40

Commits on Aug 7, 2019

fix: 1 raise MemoryError when using Random Sampler, 2 raise key error when using cmaes in multithread, 3 use mongodb internal lock to avoid dead lock in multithread
yangzhg
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