🍇 GRAPE

GRAPE (Graph Representation leArning, Predictions and Evaluation) is a fast graph processing and embedding library, designed to scale with big graphs and to run on both off-the-shelf laptop and desktop computers and High-Performance Computing clusters of workstations.

The library is written in Rust and Python programming languages, and has been developed by AnacletoLAB (Dept. of Computer Science of the University of Milan), in collaboration with the Robinson Lab - Jackson Laboratory for Genomic Medicine and with the BBOP - Lawrence Berkeley National Laboratory.

The library is composed of two main modules, Ensmallen, which is the Rust/Python high-performance graph processing submodule, and Embiggen, which is the Python Graph Representation learning, Prediction and Evaluation submodule.

Installation of GRAPE

As usual, just install it from PyPi by running:

pip install grape

Generally, the installation does not take longer than a minute.

It is possible to manually compile Ensmallen for any OS, libc version, and CPU architecture (such as Arm, AArch64, RiscV, Mips) which are supported by Rust and LLVM. Just open an issue if you need some help.

Main functionalities of the library

• Robust graph loading and graph retrieval:

  • 80K+ graphs
  • Support for multiple graph formats
  • human readable reports of graph characteristics

• 60+ Node embedding models, with easy integration of third parties libraries.

  • DeepWalk, Walklets and Node2Vec-based CBOW, SkipGram and GloVe, also with degree normalization!
  • First and second order LINE
  • Unstructured, Structured Embedding, TransE
  • All embedding models have an MMAPP-ed versions to allow for very large embeddings
  • All embedding models have support for mixed precision, allowing embedding using 16 bits floats
  • Integrated models from Karate Club and PyKEEN

• 20+ Classifier models, with easy integration of third parties libraries.

  • All sklearn models, adapted for edge prediction, edge-label prediction and node-label prediction
  • GraphSAGE and Kipf GCN for edge prediction, edge-label prediction and node-label prediction
  • Baseline Perceptron for edge prediction
  • Integrated support to parallelize holdouts across a SLURM cluster

• Graph processing: if NetworkX has it, odds are good we have it and it is way faster!

  • Resnik, Jaccard, Ancestors Jaccard similarities
  • Diameter, Vertex cover, connected components, Triangles, Squares, Betweenness Centrality, HyperBall-based approximated Closeness and Harmonic centralities, Exact Closeness centrality and Exact Harmonic centrality
  • Filters on graph properties and set operations on graph edges

• Graph visualization tools

  • TSNE, UMAP, PCA of embeddings
  • Edge properties

Tutorials

You can find tutorials covering various aspects of the GRAPE library here. All tutorials are as self-contained as possible and can be immediately executed on COLAB.

If you believe that any example may be of help, do feel free to open a GitHub issue describing what we are missing in this tutorial.

Documentation

On line documentation (currently being updated)

The on line documentation of the library is available here. Since Ensmallen is written in Rust, and PyO3 (the crate we use for the Python bindings), doesn't support typing, the documentation is obtained generating an empty skeleton package. This allows to have a proper documentation but you won't be able to see the source-code in it.

Using the automatic method suggestions utility

To aid working with the library, GRAPE provides an integrated recommender system meant to help you either to find a method or, if a method has been renamed for any reason, find its new name.

As an example, after having loaded the STRING Homo Sapiens graph, the function for computing the connected components can be retrieved by simply typing components as follows:

from grape.datasets.string import HomoSapiens

graph = HomoSapiens()
graph.components

The code above will raise the following error, and will suggest methods with a similar or related name:

AttributeError                            Traceback (most recent call last)
<ipython-input-3-52fac30ac7f6> in <module>()
----> 2 graph.components

AttributeError: The method 'components' does not exists, did you mean one of the following?
* 'remove_components'
* 'connected_components'
* 'strongly_connected_components'
* 'get_connected_components_number'
* 'get_total_edge_weights'
* 'get_mininum_edge_weight'
* 'get_maximum_edge_weight'
* 'get_unchecked_maximum_node_degree'
* 'get_unchecked_minimum_node_degree'
* 'get_weighted_maximum_node_degree'

In our example the method we need for computing the graph components would be connected_components.

Now the easiest way to get the method documentation is to use Python's help as follows:

help(graph.connected_components)

And the above will return you:

connected_components(verbose) method of builtins.Graph instance
Compute the connected components building in parallel a spanning tree using [bader's algorithm](https://www.sciencedirect.com/science/article/abs/pii/S0743731505000882).

**This works only for undirected graphs.**

The returned quadruple contains:
- Vector of the connected component for each node.
- Number of connected components.
- Minimum connected component size.
- Maximum connected component size.

Parameters
----------
verbose: Optional[bool]
    Whether to show a loading bar or not.


Raises
-------
ValueError
    If the given graph is directed.
ValueError
    If the system configuration does not allow for the creation of the thread pool.

Cite GRAPE

Please cite the following paper if it was useful for your research:

@article{cappelletti2023grape,
  title={GRAPE for Fast and Scalable Graph Processing and random walk-based Embedding},
  author={Cappelletti, L. and Fontana, T. and Casiraghi, E. and Ravanmehr, V. and  Callahan, T.J. and  Cano, C. and Joachimiak, M.P. and Mungall, C.J. and Robinson, P.N. and Reese, J. and Valentini, G.},
  year={2023},
  doi={10.1038/s43588-023-00465-8},
  journal={Nature Computational Science}}