Search the most similar strings against the query in Python 3.
Project description
Search the most similar strings against the query in Python 3. State-of-the-art algorithm and data structure are adopted for best efficiency. For both flexibility and efficiency, only set-based similarities are supported right now, including Jaccard and Tversky.
Installation
This package is available on PyPI. Just use pip3 install -U TopSim
to install it.
CLI Usage
You can simply use the algorithm on terminal.
Usage:
topsim-cli <query> [options] [<file>]
Options:
-I Case-sensitive matching.
-k <k> Maximum number of search results. [default: 1]
--tie Include all the results with the same similarity of the "k"-th result. May return more than "k" results.
-s, --search Search the query within each line rather than against the whole line, by preferring partial matching of the line.
Tversky similarity is used instead of Jaccard similarity.
-e <e> Parameter for "tversky" similarity. [default: 0.001]
--mapping=<mapping> Map each string to a set of either "gram"s or "word"s. [default: gram]
--numgrams=<numgrams> Number of characters for each gram when mapping by "gram". [default: 2]
--quiet Do not print additional information to standard error.
- The query is matched against each line of the input file (or standard input).
- Each line and its similarity are separated by tab character
\t
.
API Usage
Alternatively, you can use the algorithm via API.
from topsim import TopSim
ts = TopSim([
"python2",
"python2.7",
"python3",
"python3.6",
])
print(ts.search("python", k=3)) # Return each similarity and the respective line numbers.
- Please check
topsim.py
for more optional parameters, like similarity function, etc.
Examples
- Search the most similar line.
ls /usr/bin | topsim-cli "top"
top 1.0
- Search the three most similar lines.
ls /usr/bin | topsim-cli "top" -k 3
top 1.0
tops 0.5
iotop 0.4286
- Use Jaccard similarity in default, which puts same weight on matching both the query and the lines.
ls /usr/bin | topsim-cli "git" -k 5
git 1.0
wait 0.2857
git-shell 0.2727
pluginkit 0.2727
kinit 0.25
- Use Tversky similarity, which puts most weight on matching the query. Ideal when searching within long lines.
ls /usr/bin | topsim-cli "git" -k 5 -s
git 1.0
git-shell 0.7489
pluginkit 0.7489
git-cvsserver 0.7481
git-upload-pack 0.7478
- For
n
-gram mapping, higher number ofn
for can result in better accuracy but fewer matches.
ls /usr/bin | topsim-cli "git" -k 5 -s --numgrams=3
git 1.0
git-shell 0.5993
git-cvsserver 0.5988
git-upload-pack 0.5986
git-receive-pack 0.5984
- Full support of Chinese/Japanese/Korean.
cat test
地三鲜
红烧肉
烤全牛
木须肉
土豆炖牛肉
cat test | topsim-cli "牛肉" -k 3 -s
土豆炖牛肉 0.666
红烧肉 0.3332
木须肉 0.3332
Tip
I strongly encourage using PyPy instead of CPython to run the script for best performance.
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