Github user feynmanliang commented on the pull request:
https://github.com/apache/spark/pull/6887#issuecomment-113951123
I actually think @mengxr suggestion makes sense; it guarantees that the
output is an actual n-gram rather than being dependent on whether the input
length > n or not.
Another possibility could be to pad with some null word. The use cases I am
imagining is a n-gram HMM language model, in which case partial sentences with
k words (k < n) should be represented by padding null words on the right.
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