Multi thread#1

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liaoyg wants to merge 7 commits intomasterfrom

Commits on Apr 26, 2017

change to multi-thread loading process
liaoyg
committed

Commits on May 23, 2017

Add Streamline distance filtering
liaoyg
committed

Commits on Mar 22, 2018

Commits on May 3, 2018

Add vector reference data and CPU LIC
liaoyg
committed

Commits on Aug 1, 2019

graduate_closure
liaoyg
committed