Creates a skip-ngram iterable from a list of tokens. It does not detect any sentence boundaries.
Thus, one should make sure to only add lists that reflect a sentence or a phrase.
Definition of skip-ngrams follows: David Guthrie, Ben Allison, W. Liu, Louise Guthrie, and Yorick
Wilks. A closer look at skip-gram modelling. In Proceedings of the Fifth international Conference
on Language Resources and Evaluation (LREC) pages 1222–1225, 2006