Nov 30, 2020Visualizing the XKCD comics network using Google Vision, spaCy and d3I love XKCD. According to their website, the webcomic is about romance, sarcasm, math, and language, but after so many years, Randall Munroe explored many other topics as well. Some of them more than once. I wanted to know the structure of this fantastic stick-figure world he created, so in…Xkcd3 min readXkcd3 min read
Published inTowards Data Science·Nov 18, 2020Google DataStudio dashboards: how to add A/B test significance level in 5 minutesMany Data Scientists use an automated tool for A/B tests, like Google’s Firebase or Optimize. These tools let you choose which metrics to pay attention to, and they automatically tell you when your test reached significant levels. However, sometimes you need to do everything manually. That’s why Data Scientists get…Ab Testing2 min readAb Testing2 min read
Published inTowards Data Science·Oct 8, 2020Automating the boring stuff: data questionsA bot that knows SQL — 10 days after joining fromAtoB, in September 2019, when I was still living in a hotel, we decided to restructure our Google DataStudio dashboards. The goal was to help people understand what questions could already be answered with a chart. Simple, repeated questions about the data should not be manually…Dataqna3 min readDataqna3 min read
Published inTowards Data Science·Jul 13, 2020A quick tutorial on Gephi layouts — using a Q&A StackOverflow datasetThe other day I needed to revise Gephi layouts when preparing for a teaching/consultancy service for a friend who does Social Network Analysis. Here is a summary of what I re-learned. Gephi is an amazing open-source network analysis and (interactive!) visualization software with tons of really useful tools for exploring…Network Science7 min readNetwork Science7 min read
Published inTowards Data Science·May 20, 2020Automate the boring stuff: how to create and open a named Jupyter Notebook from the command lineToday I woke up and I realized that even though I love automating things, I kept repeating the following behavior: I decide to start a new experiment. I run jupyter-notebook on the terminal. I create a new notebook in the dashboard. I rename the notebook. I start hacking. I had…Bash2 min readBash2 min read
Published inTowards Data Science·May 18, 2020Why you may be getting low test accuracy: try Kolmogorov-SmirnovKolmogorov-Smirnov helps to compare the distributions of the training and test set. Use Mahalanobis first for word embeddings. — In a previous post, I described a neat trick to try when you are getting a high training score but a low test score. …Big Data5 min readBig Data5 min read
Published inTowards Data Science·May 12, 2020Getting low test accuracy? Compare the training and test sets like thisIf you are a Data Scientist, this probably happened to you: you got excellent results for your model during the learning process, but when using the test set, or after deploying to production, you get a much lower score: everything just goes wrong. Am I overfitting? Do I have a…Data Science3 min readData Science3 min read
Dec 1, 20195 viral AI apps that do weird things to your photos…and they will probably get weirder with time. — These last couple of years were kind of a boom for image recognition tools. Especially the ones that use GANs (Generative Adversarial Networks, an incredible idea) to achieve their goals. Here are the new toys we can play with (can you imagine the level of madness of the tools that…AI2 min readAI2 min read
Jul 19, 2019Visualizando grafos para entender la estafa del telar de la abundanciaVer cómo la mayoría pierde su dinero en una simulación vale más que mil palabras — La estafa del telar de la abundancia (o “Flor de la abundancia”, o “mandala de la abundancia”) ya es muy conocida, y ahora resurgió empleando un discurso feminista. La idea es muy simple: veamos la flor de arriba. Cada pétalo representa a una persona. Imaginemos que le faltan todos los…Ponzi6 min readPonzi6 min read
Published inTowards Data Science·Jun 28, 2019Buenos Aires bicycle lanes: Let’s go for a ride togetherWho doesn’t like a good bicycle ride in the park? Buenos Aires people (“porteños”, a word which refers to our port), apparently love it. In this article we will resume some analyses done with the goal of identifying and understanding social patterns hidden in Buenos Aires Ecobicis open data. This…Bicycles4 min readBicycles4 min read
