Unk frequency#2

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delihiros wants to merge 3 commits intoodashi:masterfrom

delihiros:unk_frequency

Commits on Jan 5, 2017

add option unk_frequency to adjust vocabulary size.
delihiros
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add option unk_frequency to adjust vocabulary size.
delihiros
committed
Merge branch 'unk_frequency' of https://github.com/delihiros/nmtkit into unk_frequency
delihiros
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