To run the file you must have nltk package installed along with Python.
From command line: python DocSumm.py <file_name>
The above command will produce length of sentences needed to included ever word of document and and also length of the document in number of sentences.
It will run with default options of
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no stemming
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no stopword removal
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greedy based algorithm
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using simple size metric
For more information on options please run command: python DocSumm.py -h