fix wordgraph bug: 'wordgraph_check_coherence' will check wordgraph f…#124

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xiaowenth wants to merge 1 commit intojulius-speech:masterfrom

xiaowenth:master_wordgraph_loop

Commits on Dec 18, 2019

fix wordgraph bug: 'wordgraph_check_coherence' will check wordgraph failed, if wordgraph has loop after 'merge_contexts' 'swap_rightword' or 'swap_leftword' in wordgraph_compaction_thesame_sub
wangwg
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