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[D] How to do trend analysis on textual data

Hi all, I am now working on a dataset of customer reviews and we would like to analyze how customer feedback change across time. For sentiment it is easy as I can build a sentiment classifier and have a sentiment scores, and do conventional time-series analysis on the score. However, when it comes to analysis like topic-modeling, is there any time-trend related analysis on topic-modeling? Thanks for any advices.

submitted by /u/InventorWu
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Toronto AI is a social and collaborative hub to unite AI innovators of Toronto and surrounding areas. We explore AI technologies in digital art and music, healthcare, marketing, fintech, vr, robotics and more. Toronto AI was founded by Dave MacDonald and Patrick O'Mara.