UnexPatterns is a an algorithm that mines unexpected patterns from large attributed graphs.

It relies on the combination of information-theoretic based measure of Unexpectedness [1] as an interestingness measure to select relevant patterns and pruning techniques to reduce the search space.

[1] Dessalles, J.L.: Algorithmic simplicity and relevance. Algorithmic Probability and Friends - LNAI 7070, pp. 119–130, Springer (2013).

Clone this project and install dependencies:

git clone
cd UnexPatterns
pip install -r requirements.txt

The five real-world datasets used in our work are provided either in data/ directory or accessible through Netset:

• 'wikivitals'
• 'wikivitals-fr'
• 'wikischools'
• 'sanFranciscoCrimes'
• 'ingredients'

Use parameters.txt to specify the dataset(s) and parameter(s) value. As an example:

datasets: wikivitals, wikivitals-fr
s: 8
beta: 4
delta: 0
patterns_path: output

where:

• datasets: Dataset name (if several datasets, names are coma-separated)
• s: Minimum number of nodes in pattern
• beta: Minimum number of attributes in pattern
• delta: Minimum amount of unexpectedness difference between two patterns
• patterns_path: Path to output directory

To mine patterns according to parameters.txt, use the following command:

python unexpatterns.py parameters.txt

Patterns are stored in binary format, within output/patterns/ directory. To extract them, you can use:

with open(f'output/patterns/<patterns>.bin', 'rb') as data:
    patterns = pickle.load(data)

The naming convention of each file is the following: result_<dataset>_<beta>_<s>_<delta>.bin.

The variable patterns then contains a list of patterns, each in the form of a tuple (X_i,Q_i) where X_i is the set of node indexes and Q_i the set of attribute indexes of the i^th pattern.

Code for experiments and comparisons with baseline and state-of-the-art aglorithms are provided in experiments/ directory.