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hey everyone welcome back this is professor xiao the purpose of this video is to help you with a specific homework question the question is hands-on practice so lets go to a jupyter notebook all the demos in this video is based on the data set yelp 1. this video may use some of these packages especially re for regular expression gensim and scikit-learn note that i use the numpy random seed 1 and random state 1. after reading the data set here is a high level information about the data set and the columns included i printed the first 10 rows of the data by selecting a few columns we will be focusing on the review text column of this data set which includes each of the review texts the first review text the second review text and such and such each review text is referred to as a document this is how nlp programmers refer to the texts and the entire column of review text will be called a corpus now lets look at specific problem this video will focus on the symbol strings that we dont