Welcome to Grafos.ml:

Tools for large-scale Machine Learning and Graph Analytics

graph --> graphos --> grafos

Okapi: Most Advanced Open-Source ML Library
for Apache Giraph

Zombie ipsum

For support Check our Okapi Mailing List

Next, check out our real-time Giraph!

Scroll down

Real-time Giraph:
Next generation graph analytics engine

Original vectors

Making it easy and efficient to analyze dynamic graphs

In many cases, your graph is dynamic and you need your analytical tools to be able to handle near real-time changes.

However, a tool like Giraph is designed for batch processing on static data, much like Hadoop. Running Giraph jobs continuously on large graphs to keep your analytics up-to-date can become computationally expensive or lead to slow responses.

On the flip side, writing custom algorithms for dynamic graphs is a hard and time consuming programming task and may even be challenging for most programmers.

RT-Giraph keeps your graph analytics up-to-date efficiently and with little programming effort. It runs existing Giraph algorithms, with the added benefit that whenever the graph changes, RT-Giraph can update the changes seamlessly, resulting in faster computation than re-running algorithms from scratch.

Learn more About RT-Giraph

User friendly tools for Giraph!

Scroll down

Start with Giraph in under a minute:
Download jar, open your browser, configure your first job.

Zombie ipsum

Configure your first Giraph Job!

Create Configuration

#prepare the data
df = pd.read_csv(..., names=['user', 'item', 'rating', 
			     'date', 'title'])
training, testing = testfm.split.holdoutByRandom(df, 0.9)

#tell me what models we want to evaluate
models = [  RandomModel(),

items = training.item.unique()
for m in models:
	print m.getName().ljust(50),
	print testfm.evaluate_model(m, testing, all_items=items)

Simplify your Collaborative Filtering testing with test.fm

Clone Me!

Learn who we are!

Scroll down


A cookie

Linas Baltrunas

Associate Researcher at Telefonica Digital. Works on recommendation systems (contextual if possible) and fond of seeing how projects get alive. In love with mountains.

  • linas[at]tid[dot]es
A cookie

Dionysis Logothetis

A distributed systems guy by birth. He contributes to the Okapi library, and builds RT-Giraph. He is an Associate Researcher @Telefonica Digital.

  • dl[at]tid[dot]es

A cookie

Alexandros Karatzoglou

Snowboarder, urban cyclist and passionate cook, in his spare time builds Machine Learning and Recommender Systems algorithms.

  • alexk[at]tid[dot]es

A cookie

Georgos Siganos

Deep diving into Big Data Systems. Georgos was a Researcher at Telefonica Digital. He is currently a Senior Scientist at Qatar Computing Research Institute.

  • siganos[at]gmail[dot]com

A cookie

Maria Stylianou

Maria the geek girl! She implemented the basis of Okapi during her master thesis @Telefonica Digital.

  • marsty5[at]gmail[dot]com

A cookie

Ilias Leontiadis

Ilias is a Research Associate at Telefonica Digital. In the past he was a researcher at University of Cambridge and received his PhD from University College London (UCL).

  • ilias[at]tid[dot]es

A cookie

Alexandre Fonseca

With a passion for code ninjaing and all things distributed, Alex contributes to Okapi and RT-Giraph in the context of his master Thesis (European Master on Distributed Computing @UPC and KTH).

  • afonseca[at]ac.upc.edu

A cookie

João Baptista

João mainly contributes to the test.fm, implementing the framework structure and connecting it to Okapi.

  • joaonrb[at]gmail.com


A cookie

Claudio Martella

Claudio is a graph fetishist, member of the LSDS group @ VU University Amsterdam, and Committer and PMC member of Apache Giraph.

A cookie

Vasia Kalavri

Vasia is a PhD student at KTH, Sweden and UCL, Belgium. She is interested in data-intensive frameworks, currently focusing on graph processing. She has a M.Sc. in Distributed Computing from UPC, Barcelona and KTH.

A cookie

Yazan Boshmaf

Self-described as a Web Janitor, is a PhD candidate at the University of British Columbia, Vancouver, Canada. He is currently building scalable defense systems to fight against the bad guys on the Web.

  • boshmaf[at]ece.ubc.ca

A cookie

Gianmarco De Francisci Morales

Research Scientist at Yahoo Labs Barcelona working at the intersection between data mining and distributed systems. Passionate about cooking and open-source, he contributes to Apache Pig, Giraph, S4, and Hadoop.

A cookie

Trung V. Nguyen

PhD Candidate at the Australian National University. Love building scalable machine learning systems for solving practical problems.


We are welcoming students to work on their master thesis or do an internship with us

for a 3-6 month period.

Not a student but still interested in cooperating with us? Drop us a line!