Yes! Although ... "Wait a minute. Strike that. Reverse it. Thank you." TF-IDF is old, and very cool. n-gram based extensions of it are a bit newer, but are li

Yes! Although ... "Wait a minute. Strike that. Reverse it. Thank you." TF-IDF is old, and very cool. n-gram based extensions of it are a bit newer, but are likely implemented in almost exactly the same way. N-grams just require a lot more compute power because your corpus grows faster than a plain ol' bag of words.