Pinned Loading

1. pLSA pLSA

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   # Modifies the code in 

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   #    github thread: https://gist.github.com/ratsgo/c25deb6d79f3ab8b0b050af751fbbdb8#file-plsa-r-L78

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   # to speed it up by introducing vectorisation alternatives to nested for loops

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   # and by avoiding cumbersome string lookups

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