Interpreting Isolation Forest’s predictions — and not only

Photo by Joshua Golde on Unsplash

The problem: how to interpret Isolation Forest’s predictions

More specifically, how to tell which features are contributing more to the predictions. Since Isolation Forest is not a typical Decision Tree (see Isolation Forest characteristics here), after some research, I ended up with three possible solutions:

1) Train on the same dataset another similar algorithm that has feature importance…

Leverage Machine Learning to defend against DDoS

Baskerville logo source:

Manual identification and mitigation of (DDoS) attacks on websites is a difficult and time-consuming task with many challenges.

This is where Baskerville comes in.

Baskerville is an open-source Security Analytics Engine, a system to identify the attacks (currently) directed to Deflect protected websites as they happen and give the infrastructure…

Thank you for your kind words! And thank you so much for sharing such an amazing project! Watching... :)

Very happy to know the article and code were useful to you. Of course you can use the code, thanks for asking!

First of all, I really enjoyed your thorough analysis, excellent article, thanks!

For the highlighted part, I of course agree about the NoSQL case, but the `no relationship` part is not exactly true, right? I mean there is the UserID that links the two tables, it is just going to be handled differently.

Time to check your spark clusters

Image by Author

It is well known — or should be — that spark is not secured by default. It is right there in the docs

Security in Spark is OFF by default

So you should be well aware that you’ll need to put the effort to secure your cluster. And there are…

Research and awareness needed

source: author’s quick drawing


It seems that more and more people are agreeing that G6PDd can be a risk factor for COVID-19, not only in terms of the medication that is used to combat the virus, but regarding one’s susceptibility to the virus and the severity of its side-effects…

Lessons learned

Debugging PySpark and Isolation Forest — Image by author

So, after a few runs with the PySpark ml implementation of Isolation Forest presented here, I stumbled upon a couple of things and I thought I’d write about them so that you don’t waste the time I wasted troubleshooting.

Only Dense Vectors

In the previous article, I used VectorAssembler to gather the feature…

How to leverage spark to read in parallel from a database

Spark Parallelization

A usual way to read from a database, e.g. Postgres, using spark would be something like the following:

However, by running this, you will notice that the spark application has only one task active, which means, only one core is being used and this one task will try to…

Maria Karanasou

A mom and a Software Engineer who loves to learn new things & all about ML & Big Data. Buy me a coffee to help me keep going

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