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```# Python implementation of Lempel-Ziv Complexity

This repository contains a small, simple and efficient implement of the [Lempel-Ziv complexity](https://en.wikipedia.org/wiki/Lempel-Ziv_complexity) algorithm.

## Examples
### Simple usage
If [`lempel_ziv_complexity.py`](lempel_ziv_complexity.py) is accessible in your PATH or in Python's path:

```python
>>> from lempel_ziv_complexity import lempel_ziv_complexity
>>> s = '1001111011000010'
>>> lempel_ziv_complexity(s)  # 1 / 0 / 01 / 1110 / 1100 / 0010
6
```

### With the C extension
If the [`lempel_ziv_complexity.so`](lempel_ziv_complexity.pyx) is accessible in your PATH or in Python's path:

### Small benchmark
There is also a Cython version, to have a faster implementation:
```python
>>> s = '1001111011000010'
>>> %timeit lempel_ziv_complexity(s)
6.1 µs ± 33.6 ns per loop (mean ± std. dev. of 7 runs, 100000 loops each)
>>> %timeit lempel_ziv_complexity_cython(s)
132 ns ± 2.55 ns per loop (mean ± std. dev. of 7 runs, 10000000 loops each)
```
The speedup is typically between ×50 and ×100.

## Demo on a [Jupyter notebook](https://www.Jupyter.org/)
See this notebook: [on nbviewever](https://Nbviewer.Jupyter.org/github/Naereen/Lempel-Ziv_Complexity/Short_study_of_the_Lempel-Ziv_complexity.ipynb).

----

## Install and build
### Manually ?
Easy!

Clone this repository, go in the folder, compile, test, and if it works, install it.

```bash
cd /tmp/
git clone https://GitHub.com/Naereen/Lempel-Ziv_Complexity
cd Lempel-Ziv_Complexity/src/
make build
make test     # should pass
make install  # mv the build/lib*/*.so files where you need them
```

Be sure to include the dynamic library when you need it, or in a folder accessible by your Python interpreter (somewhere in `sys.path`).
The file is `lempel_ziv_complexity_cython.so` (for Python 2) or the `lempel_ziv_complexity_cython.cpython-35m-x86_64-linux-gnu.so` (for Python 3.5, or higher, adapt the name).

## With pip ?
> Not yet.

This project will soon be hosted on [the Pypi package repository](https://pypi.python.org/pypi/lempel_ziv_complexity).

[![lempel_ziv_complexity in pypi](https://img.shields.io/pypi/v/lempel_ziv_complexity.svg)](https://pypi.python.org/pypi/lempel_ziv_complexity)
![PyPI implementation](https://img.shields.io/pypi/implementation/lempel_ziv_complexity.svg)
![PyPI pyversions](https://img.shields.io/pypi/pyversions/lempel_ziv_complexity.svg)

----

## About
### Language?
Python v2.7+ or Python v3.1+.

- [Numba](http://numba.pydata.org/) can be used to speed up the pure Python version.
- [Cython](http://cython.org/) is *needed* to build the C extension (faster).

### :scroll: License ? [![GitHub license](https://img.shields.io/github/license/Naereen/Lempel-Ziv_Complexity.svg)](https://github.com/Naereen/badges/blob/master/LICENSE)
[MIT Licensed](https://lbesson.mit-license.org/) (file [LICENSE.txt](LICENSE.txt)).
© [Lilian Besson](https://GitHub.com/Naereen), 2017.

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```