https://www.sisu.io/ Recent content on sisu.io Hugo -- gohugo.io en-us Thu, 09 Jul 2020 00:00:00 -0400 https://www.sisu.io/posts/embeddings/ Thu, 09 Jul 2020 00:00:00 -0400 https://www.sisu.io/posts/embeddings/ Table of Contents node2what-now? 🤔 The Les Misérables Data Set Using node2vec Reproducing Grover & Leskovec’s Findings The Demonstration Where can we go from here? Appendix: Neo4j’s Python Driver and SciKit Learn Figure 1: Graph Embeddings are Magical! Departing for once from my posting about financial fraud detection, let's take a more functional look at an upcoming capability in the new Neo4j Graph Data Science library (v1. https://www.sisu.io/posts/paysim-part3/ Fri, 20 Mar 2020 00:00:00 -0400 https://www.sisu.io/posts/paysim-part3/ Table of Contents What’s our Graph look like again? Finding our First Party Fraud Filtering the Universe with Weakly Connected Components Analyzing our Suspicious Groups Quantitatively Identifying Suspects In Summary: What Did We Find? 🎓 Learning More Next Time: Investigating Fraudulent Charges 👣 Footnotes If you’ve followed along in the PaySim series of posts or at least discovered the demo project, you’ve now got a graph representing 30 days of financial transactions in a simulated financial network running inside your Neo4j 3. https://www.sisu.io/posts/paysim-part2/ Sun, 16 Feb 2020 00:00:00 -0500 https://www.sisu.io/posts/paysim-part2/ Table of Contents Prerequisites for you Home Gamers Starting with the End in Mind Time to Write Some Code! Step 1: Enforcing a Schema Step 2: Iteratively Loading PaySim Transactions Step 3. Disguising our Mules Step 4. Establishing Identities and their Relationships Step 5. Updating Additional Node Properties Step 6. Thread Transactions into Chains Putting it All Together Let’s Run It! 🏃 Building the Demo Project Tweak our Simulation Parameters Stage our Database Install the APOC Library Run the Simulation Confirm our Graph is Loaded Wrapping Up Next Time: Analyzing our Graph Previously, we looked at how PaySim models mobile money networks to simulate hidden fraudulent behavior and how my fork1 makes it possible to build off the original authors’ work and model more realistic fraud cases. https://www.sisu.io/posts/paysim/ Thu, 13 Feb 2020 00:00:00 -0500 https://www.sisu.io/posts/paysim/ Table of Contents Introduction Background: A Mobile Money Primer 💸 An Overview of PaySim Agent Types Transactions Step by Step (day by day?) 👷‍ Improving PaySim ⬆ Code Upgrades Enhancing PaySim’s Fraudsters Our Journey So Far Next Episode: Getting PaySim Transactions into Neo4j Introduction Fraud detection and investigation presents one of the most popular use cases for graph databases, especially in the financial services industry. https://www.sisu.io/about/ Sun, 24 Nov 2019 16:38:00 -0500 https://www.sisu.io/about/ Who am I? Currently a Sales Engineer @ Neo4j, the leading graph database company. On and off again software engineer and independent consultant A devout Emacs lover having drunk the lisp kool-aide. https://www.sisu.io/openbsd/2018-06-16_installing-openbsd-6-3-on-packet-net-df51a5e9083f/ Sat, 16 Jun 2018 21:57:46 +0000 https://www.sisu.io/openbsd/2018-06-16_installing-openbsd-6-3-on-packet-net-df51a5e9083f/ Note: This is an old post from when I wrote on medium.com…formatting may be wonky here until I clean it up. Image by Kurt Edblom shared under CC BY-SA 2.0 (https://flic.kr/p/fanASg) With bonus tips for configuring OpenBGPD!!! I’m experimenting with integrating OpenBSD into our infrastructure as a firewall and HTTP reverse-proxy. We currently host our data tier using Packet’s bare metal hosting, but sadly Packet doesn’t currently offer OpenBSD as a 1-click install OS. https://www.sisu.io/openbsd/2017-09-19_tips-for-alpine-linux-under-openbsd-dca8d09568b4/ Tue, 19 Sep 2017 11:48:58 +0000 https://www.sisu.io/openbsd/2017-09-19_tips-for-alpine-linux-under-openbsd-dca8d09568b4/ Note: This is an old post from when I wrote on medium.com…formatting may be wonky here until I clean it up. Matterhorn…if you squint you can see Puffy up there, I swear. (https://commons.wikimedia.org/wiki/File:Matterhorn_from_Domh%C3%BCtte_-_2.jpg) Virtualization is just plain fun. While I do rely on it specifically to satisfy professional needs while running OpenBSD on my laptop (mostly hacking on some enterprise Java software that doesn’t natively support *BSD), I find myself constantly fascinated by it and tinkering with it. https://www.sisu.io/openbsd/2017-05-29_docker-on-openbsd-6-1-current-c620513b8110/ Mon, 29 May 2017 16:15:05 +0000 https://www.sisu.io/openbsd/2017-05-29_docker-on-openbsd-6-1-current-c620513b8110/ Note: This is an old post from when I wrote on medium.com…formatting may be wonky here until I clean it up. (Edit on 30 May 2017: Lots of feedback, thanks! One thing to clarify for readers is this is really a step towards a Docker Machine setup vs. a Docker Engine…i.e. using Docker for local development.) So here’s the thing. I’m normally a macOS user…all my hardware was designed in Cupertino, built in China.