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How I Built 🍣This Sushi Does Not Exist🍣
December 19, 2020 | 3 min readLightweight 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 readIf 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 readHow 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.

Transformers Now: A Survey of Recent Advances
November 02, 2020 | 10 min readTransformer 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 readThis post introduces how to sample groups from a dataset, which is helpful when you want to avoid data leakage.

マリオカートで結婚後の名字を決めた話
September 27, 2020 | 5 min readなぜ結婚後の名字をマリオカートで決めることになったのか、また選択的夫婦別姓について書きます。

Different Measures of Feature Importance Behave Differently
September 05, 2020 | 7 min readThis post compares the behaviors of different feature importance measures in tricky situations.