cuBool library python bindings.

## Project description

# pycubool

**pycubool** is a python wrapper for cuBool library.

**cuBool** is a linear Boolean algebra library primitives and operations for
work with sparse matrices written on the NVIDIA CUDA platform. The primary
goal of the library is implementation, testing and profiling algorithms for
solving *formal-language-constrained problems*, such as *context-free*
and *regular* path queries with various semantics for graph databases.
The library provides C-compatible API, written in the GraphBLAS style.

**The library** is shipped with python package **pycubool** - wrapper for
cuBool library C API. This package exports library features and primitives
in high-level format with automated resources management and fancy syntax sugar.

**The primary library primitive** is a sparse boolean matrix. The library provides
the most popular operations for matrix manipulation, such as construction from
values, transpose, sub-matrix extraction, matrix-to-vector reduce, matrix-matrix
element-wise addition, matrix-matrix multiplication and Kronecker product.

**As a fallback** library provides sequential backend for mentioned above operations
for computations on CPU side only. This backend is selected automatically
if Cuda compatible device is not presented in the system. This can be quite handy for
prototyping algorithms on a local computer for later running on a powerful server.

## Features

- Matrix creation (empty, from data, with random data)
- Matrix-matrix operations (multiplication, element-wise addition, kronecker product)
- Matrix operations (equality, transpose, reduce to vector, extract sub-matrix)
- Matrix data extraction (as lists, as list of pairs)
- Matrix syntax sugar (pretty string printing, slicing, iterating through non-zero values)
- IO (import/export matrix from/to
`.mtx`

file format) - GraphViz (export single matrix or set of matrices as a graph with custom color and label settings)
- Debug (matrix string debug markers, logging)

## Simple example

Create sparse matrices, compute matrix-matrix product and print the result to the output:

```
import pycubool as cb
a = cb.Matrix.empty(shape=(2, 3))
a[0, 0] = True
a[1, 2] = True
b = cb.Matrix.empty(shape=(3, 4))
b[0, 1] = True
b[0, 2] = True
b[1, 3] = True
b[2, 1] = True
print(a, b, a.mxm(b), sep="\n")
```

## Transitive closure example

Compute the transitive closure problem for the directed graph and print the result:

```
import pycubool as cb
a = cb.Matrix.empty(shape=(4, 4))
a[0, 1] = True
a[1, 2] = True
a[2, 0] = True
a[2, 3] = True
a[3, 2] = True
t = a.dup() # Duplicate matrix where to store result
total = 0 # Current number of values
while total != t.nvals:
total = t.nvals
t.mxm(t, out=t, accumulate=True) # t += t * t
print(a, t, sep="\n")
```

## GraphViz example

Generate GraphViz graph script for a graph stored as a set of adjacency matrices:

```
import pycubool as cb
name = "Test" # Displayed graph name
shape = (4, 4) # Adjacency matrices shape
colors = {"a": "red", "b": "green"} # Colors per label
a = cb.Matrix.empty(shape=shape) # Edges labeled as 'a'
a[0, 1] = True
a[1, 2] = True
a[2, 0] = True
b = cb.Matrix.empty(shape=shape) # Edges labeled as 'b'
b[2, 3] = True
b[3, 2] = True
print(cb.matrices_to_gviz(matrices={"a": a, "b": b}, graph_name=name, edge_colors=colors))
```

Script can be rendered by any gviz tool online and the result can be following:

## Contributors

- Egor Orachyov (Github: EgorOrachyov)
- Pavel Alimov (Github : Krekep)
- Semyon Grigorev (Github: gsvgit)

## Citation

```
@online{cuBool,
author = {Orachyov, Egor and Alimov, Pavel and Grigorev, Semyon},
title = {cuBool: sparse Boolean linear algebra for Nvidia Cuda},
year = 2020,
url = {https://github.com/JetBrains-Research/cuBool},
note = {Version Alpha}
}
```

## License

This project is licensed under MIT License. License text can be found in the license file.

## Acknowledgments

This is a research project of the Programming Languages and Tools Laboratory at JetBrains-Research. Laboratory website link.

## Also

The name of the library is formed by a combination of words *Cuda* and *Boolean*,
what literally means *Cuda with Boolean* and sounds very similar to the name of
the programming language *COBOL*.

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