Tuesday, 6 October 2020

Graphistania 2.0 - Episode 9 - The one about the (Graph Databases for) Dummies (book)

Here's a nice new episode of the Graphistania podcast for you: for the first time in 5 years, I was able to get the fantastically awesome Chief Scientist of Neo4j, Dr. Jim Webber, back to the podcast. Jim is a great colleague and friend, and one of the best tech public speakers in the business - especially when you want to talk Graphs and distributed systems. Over the past few months, I had the pleasure of working together with Jim on a more regular basis - as we actually wrote a book together: the Graph Databases for Dummies book. It was announced on the Neo4j blog, and seems to have been doing really well in the past few weeks. Some of you may remember that Jim co-wrote The O'Reilly book on Graph Databases, and I wrote Learning Neo4j by Packt (2nd edition together with Jérôme Baton) - and we have had a bit of friendly banter going back and forth about the quality of both artifacts :) ... it has been a ton of fun.

So here's the chat that we recorded about the new book - hope you enjoy it as much as we did.

Here's the transcript of our conversation:
RVB - 00:00:00.151 Hello, everyone. My name is Rik, Rik Van Bruggen, from Neo4j, and here I am again recording another episode of our Graphistania podcast. And this is a special one. This is a special episode, one that we've been talking about for some time, because I have a very special guest on this show, and that is my dear friend and colleague Jim Webber. Hey, Jim.

Tuesday, 29 September 2020

Using Apache Zeppelin with Neo4j to analyse the FinCEN Files

Last week, we got another great and widely publicised case of Graph Databases' usefulness throw our way. The ICIJ published their FinCEN Files research, and on top of allowing you to explore the data on their website they also published an anonymised subset of the data as a series of CSV/JSON files. My friends and colleagues Michael Hunger, Will Lyon and the rest of the team, helped with the process of making this subset available as a Neo4j database (see this github repo), and there's even a super easy FinCEN Files Neo4j Sandbox that you can spin up in no time for some investigation fun.

So of course I had to take this data for a spin myself - it seems really important to me that more eyeballs are looking at this, and more people exposing the sometimes very questionable behaviour of the world's largest financial institutions.

Introducing Zeppelin

I had heard of some great technology a while ago that would allow people to use their data in a very different way, by looking at these interactive webpages that would interact with a Neo4j database.



Wednesday, 23 September 2020

Exponential growth in Neo4j

With the current surges of the Covid-19 Pandemic globally, there is a huge amount of debate raging in our societies - everywhere. It’s almost as if the duality between left and right that has been dividing many political spectra in the past few years, is now also translating itself into a duality that is all about more freedom for the individual (and potentially - a higher spread of the SARS-CoV-2 virus), versus more restrictions for the individual. It’s such a difficult debate - with no clear definitive outcome that I know of. There’s just too many uncertainties and variations in the pandemic - I personally don’t see how you can make generic statements about it very easily.

One thing I do know though, is that very smart and loveable people, in my own social and professional circle and beyond, seem to be confused by some of the data. Very often, they make seemingly rational arguments about the numbers that are seeing - but ignoring the fact that we are looking at an Exponential Growth problem. In this post, I want to talk about that a little bit, and illustrate it with an example from the Neo4j world.

What is Exponential Growth exactly?

Let’s take a look at the definition from good old Wikipedia:
Exponential growth is a specific way that a quantity may increase over time. It occurs when the instantaneous rate of change (that is, the derivative) of a quantity with respect to time is proportional to the quantity itself. Described as a function, a quantity undergoing exponential growth is an exponential function of time, that is, the variable representing time is the exponent (in contrast to other types of growth, such as quadratic growth).
The basic functions that are being entertained here are very simple in terms of the maths:


Friday, 18 September 2020

OpenTrials in Neo4j - with a simple ETL job

I have been meaning to write about this for such a long time. Ever since the lockdown happened, I have been wanting to take a look at a particular biomedical dataset that looks extremely interesting to me: the OpenTrials dataset. If you are not familiar with this yet, this is what they say:

OpenTrials is a collaboration between Open Knowledge International and Dr Ben Goldacre from the University of Oxford DataLab. It aims to locate, match, and share all publicly accessible data and documents, on all trials conducted, on all medicines and other treatments, globally. 

It's a super interesting initiative, and it really flows from the idea that in much of the very intensive, expensive biomedical research, we should be looking at how to better use and re-use the knowledge that we are building up. Kind of like what people in the CovidGraph.org initiative, het.io (remember the interview I did with Daniel - so great!) and others are doing. 


Downloading and restoring the dataset

It's a bit hidden, but you can actually download a (slightly older, but still) dataset of the OpenTrials dataset from their website. The dataset is actually a Postgres dump file: I got the latest one from http://datastore.opentrials.net/public/opentrials-api-2018-04-01.dump

Monday, 7 September 2020

Graphistania 2.0 - Episode 8 - The one after the Covid-summer

No sure if we should be happy or sad - but hey - the Covid-19 summer of 2020 is almost behind us. Like most people, I found it quite a strange and unusual summer, with very few foreign adventures (although I did manage to squeeze in a cycling/camping trip to the French Alps in July), lots of cycling, some great family time... and of course lots of time with graphs :) ... 

So that means that we are also kicking the Graphistania podcast back into gear - here's the next episode for you:


Here's the transcript of our conversation:

RVB: 00:00:15.863 [music] Hey, Stefan, I do need to ask you for consent, I think, right?

SW: 00:00:19.847 Hi. Yeah, I consent. [laughter] This is always the weird moment.

RVB: 00:00:24.727 Exactly. I thought, "Start with that one again."

SW: 00:00:28.436 Exactly, just to create a little bit of tension in the air.

Wednesday, 8 July 2020

Graphistania 2.0 - Episode 7 - The one after the Covid-19 lockdown

Yes! We were able to record and publish another episode of our Graphistania podcast. It's been an amazing and turbulent couple of months - but before the summer holiday season really takes off we wanted to get this to you.

Wishing you a fantastic and relaxing time - and in the mean time enjoy this episode!

Here's the transcript of our conversation:

Monday, 29 June 2020

Executives of Belgian Public Companies - revisited!