Fix issue with unsigned int negation in vocab map writer on 32-bit systems.
Fix issue with unsigned int negation in vocab map writer on 32-bit systems.

esparza83/meta,esparza83/meta,gef756/meta,husseinhazimeh/meta,gef756/meta,esparza83/meta,gef756/meta,husseinhazimeh/meta,gef756/meta,saq7/MeTA,saq7/MeTA,gef756/meta,husseinhazimeh/meta,saq7/MeTA,husseinhazimeh/meta,esparza83/meta,esparza83/meta,husseinhazimeh/meta