Hippocampus's Garden

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Welcome to Hippocampus's Garden, a Shion Honda's blog. I regularly write about machine learning, statistics, programming, and my hobbies.

How I Built 🍣This Sushi Does Not Exist🍣

December 19, 2020  |  3 min read

Lightweight GAN has opened the way for generating fine images with ~100 training samples and affordable computing resources. This post presents "This Sushi Does Not Exist" and how I built it with GAE.


Custom Objective for LightGBM

November 22, 2020  |  6 min read

If you want to use a custom loss function with a modern GBDT model, you'll need the first- and second-order derivatives. This post shows how to implement them, using LightGBM as an example


A Deeper Look at ROC-AUC

November 15, 2020  |  4 min read

How come ROC-AUC is equal to the probability of a positive sample ranked higher than negative ones? This post provides an answer with a fun example.



November 03, 2020  |  4 min read



Transformers Now: A Survey of Recent Advances

November 02, 2020  |  10 min read

Transformer has undergone various application studies, model enhancements, etc. This post aims to provide an overview of these studies.


Meet Pandas: Group-wise Sampling

October 13, 2020  |  2 min read

This post introduces how to sample groups from a dataset, which is helpful when you want to avoid data leakage.



October 11, 2020  |  4 min read




September 27, 2020  |  5 min read



Different Measures of Feature Importance Behave Differently

September 05, 2020  |  7 min read

This post compares the behaviors of different feature importance measures in tricky situations.


Meet Pandas: Query Dataframe

August 25, 2020  |  2 min read

This post introduces the Pandas method of `query`, which allows us to query dataframes in an SQL-like manner.

Shion Honda

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