I am currently doing natural language processing using python NLTK. I want to generate some beautiful graphics of the representation of input. What package can I do to get something like this?
Bokeh is the go-to visualization library for Python. Have a look at its gallery to see what it can do. I actually don't know if it can generate the kind of images you've shown though.
Altair is another capable plotting library which kindly includes a few links to other libraries in its README:
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