RAKE

A Python implementation of the Rapid Automatic Keyword Extraction (RAKE) algorithm as described in: Rose, S., Engel, D., Cramer, N., & Cowley, W. (2010). Automatic Keyword Extraction from Individual Documents. In M. W. Berry & J. Kogan (Eds.), Text Mining: Theory and Applications: John Wiley & Sons.

The source code is released under the MIT License.

Arguments

The arguments are as follows:

usage: rake.py [-h] [--stopwords [STOPWORDS.TXT]] [--debug] [--test]
               [--keywords [MAX_RETURNED]] [--soft-wrap] [--hard-wrap]
               [--flip] [--group] [--tight-group]
               [filenames [filenames ...]]

Simple example for RAKE: Rapid Automatic Keyword Extraction algorithm.

positional arguments:
  filenames             Input file(s) to use

optional arguments:
  -h, --help            show this help message and exit
  --stopwords [STOPWORDS.TXT], -s [STOPWORDS.TXT]
                        The stopword file to use. Defaults to ~/.stopwords.txt
  --debug               Enable additional debugging
  --test                Perform integrated testing
  --keywords [MAX_RETURNED], -n [MAX_RETURNED]
                        Number of keywords to return
  --soft-wrap           new-lines mark end-of-sentence
  --hard-wrap           new-lines do not mark end-of-sentence
  --flip                Flip the order so that the keyword is before the
                        filename.
  --group, -g           Prefer group-common keywords for the set of documents
  --tight-group, -G     Use a tight group with keyword: file1, file2, ...

File prefixes are present if more than one file is specified.

Notes on this version

This version needs Python 3+. I have tested it with 3.5.3. It probably no longer works with Python 2. Folks should upgrade.

The previous version fell apart when it came to contractions. I'm not sure that the current version is perfect, but for my initial test data it seems to function.

Original file didn't support arguments, and didn't do anything useful when it was run. (Same as --test.)

Proper hard-wrap support (where new-lines don't implicitly mark the end of a paragraph) is tricky. This script never did it properly. The --hard-wrap functionality remains broken, though that was the previous-default behavior. (To do it properly, you need to an initial level of Markdown or reStructuredText style conversion to meaningfully break it up.)

I extended this because I wanted an automatic way to pull useful topic information for lyrics.

Example output

When provided one argument:

$ ./rake.py MIT-License.txt
documentation files
permit persons
person obtaining
substantial portions
copyright holders
copyright notice
permission notice
sell copies
copyright
copies

When provided more than one argument, it returns --keywords responses for each file and prefixes each with the filename (like grep):

$ rake.py -n 1 *_lyrics.txt
01-Thats-the-way_lyrics.txt:future
02-Eccentric_lyrics.txt:personality disorder
03-Space-Travel_lyrics.txt:miss fried rice
04-Rise-and-Fall_lyrics.txt:landing
05-Theres-a-Dragon-Sleeping_lyrics.txt:roast duck
.
.
.

There's a --flip option that will allow you to take a batch of files and sort them to find keywords in common:

$ rake.py --flip *_lyrics.txt | sort
.
.
.
care : 01-Thats-the-way_lyrics.txt
care : 11-Im-Sorry_lyrics.txt
care : 29-That-Pickle_lyrics.txt
.
.
.
concerned : 41-Mixed-Emotions_lyrics.txt
considered : 26-Dialog_lyrics.txt
considered : 48-Purpose-Of-You_lyrics.txt
continue : 25-Bacon_lyrics.txt
.
.
.

There's a --group / -g option that tries to find common keywords within a group. It keeps the top-most keyword for a file, but the others favor the group:

$ rake.py -g --flip *_lyrics.txt | sort
afraid overfishing destroys : 12-Mysterious-Things_lyrics.txt
air : 21-My-Neighbor-Errols-Neighborhood_lyrics.txt
air : 26-Dialog_lyrics.txt
alternate pasts : 32-Fate_lyrics.txt
anymore : 22-Vile_lyrics.txt
anymore : 46-Conversation_lyrics.txt
.
.
.

There's also a --tight-group / -G option that returns the results in a more compact form, and skips the most popular for the file:

$ rake.py -G *_lyrics.txt | sort
air : 21-My-Neighbor-Errols-Neighborhood_lyrics.txt, 26-Dialog_lyrics.txt
anymore : 22-Vile_lyrics.txt, 46-Conversation_lyrics.txt
ate : 39-Palindrome_lyrics.txt, 44-Lost-In-The-Rain_lyrics.txt
avoid : 07-Vegetable-Domination_lyrics.txt, 12-Mysterious-Things_lyrics.txt
back : 03-Space-Travel_lyrics.txt, 37-Surf-Rules_lyrics.txt, 44-Lost-In-The-Rain_lyrics.txt
bear : 23-Misunderstanding_lyrics.txt, 45-Grandparents_lyrics.txt
.
.
.