main.py controls the overall logic of the program. The extension is also invoked in the main.py program.

1. query file
2. table files
3. Predicate.py
4. Variable.py
5. GibbsSampling.py
6. Lift.py

1. pandas
2. numpy
3. matplotlib
4. progressbar

These dependencies are in the requiremens.txt file.

To install them, please run

pip install -r requirements.txt

Python main.py --table t2.txt --query query.txt --table t1.txt --table t3.txt --table t4.txt

File: DataGenerator.py

How to specify the number of tuples you want:

n is not the exact number of tuples in the database. The number of tuples is on the order of $n^2$ .

change the n value at line 51 to ajust

if __name__ == "__main__":
    n = 100 #<--------change this n value
    print("Generate data points of size: " + str(n))
    DataGenerator(n) 

P, Q and R tables and they are similar to the input given in the examples P(x), Q(x), R(x, y) and T(x,y)

test_table1.txt
test_table2.txt
test_table3.txt
test_table4.txt

The implementation of the gibbs sampling extension is located in the GibbsSampling.py file. This file is called in the main.py program. You can change the number of steps,num_step, for each sampling process in the main.py program. If num_step is large, approximation result is closed to the real value, but it might take longer time compute.