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now that you have a corpus you have to take it from the unorganized raw state and start to clean it up we will focus on some common pre-processing functions but before we actually apply them to the corpus lets learn what each one does because you dont always apply the same ones for all your analyses besar has a function to lower it makes all the characters in a string lowercase this is helpful for term aggregation but can be harmful if you are trying to identify proper nouns like cities the remove punctuation function well it removes punctuation this can be especially helpful in social media but can be harmful if you are trying to find emoticons made of punctuation marks like a smiley face depending on your analyses you may want to remove numbers obviously dont do this if you are trying to text mine quantities or currency amounts but remove numbers may be useful sometimes the strip whitespace function is also very useful sometimes text has extra tabbed whitespace or extra lines thi
