Sounds like this paper from Google http://www.technologyreview.com/view/519581 http://www.technologyreview.com/view/519581 For example, the operation ‘king’ –

Sounds like this paper from Google http://www.technologyreview.com/view/519581 http://www.technologyreview.com/view/519581 For example, the operation ‘king’ – ‘man’ + ‘woman’ results in a vector that is similar to ‘queen’.