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Achievements

Achievement: Pull Sharkx2Achievement: Pair Extraordinairex2Achievement: YOLOAchievement: Arctic Code Vault Contributor

Achievements

Achievement: Pull Sharkx2Achievement: Pair Extraordinairex2Achievement: YOLOAchievement: Arctic Code Vault Contributor

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zhou100/README.md

Hi, I'm Yujun

Data scientist and economist based in San Mateo. I build tools that help people think more clearly and make better decisions. One of my recent project is voice-first interfaces for capture, reflection, and time tracking. Before this, I spent several years applying machine learning to food-security forecasting in development settings, with work published in Applied Economic Perspectives and Policy and World Development.

What I'm building now

  • brief-voice-memo — voice-first time tracker. Whisper transcribes recordings; GPT-4o-mini auto-categorizes them (TODO / IDEA / QUESTION / REMINDER) and runs AI-powered daily and weekly coaching audits.
  • dialect_voice_memo_wechatApp — the same idea, packaged as a WeChat mini-program for voice-driven capture and content organization.

Selected applied work

  • churn_prediction_music_box — calibrated churn-risk scoring tied to a unit-economics decision curve. Tells marketing what success rate clears break-even and what audience maximizes net retention value. Four models behind a unified inference layer.

Published research

  • FoodSecurityPrediction — replication code for Machine learning for food security: Principles for transparency and usability (Applied Economic Perspectives and Policy).
  • WD-Early-Warning-Food-Insecurity — replication code for A Data-Driven Approach Improves Food Insecurity Crisis Prediction (World Development).

Toolkit

Python R Jupyter scikit-learn pandas OpenAI

GitHub at a glance

Yujun's GitHub stats Top languages

Reach me

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  1. brief-voice-memo brief-voice-memo Public

    Voice-first time tracker that transcribes recordings with Whisper and auto-categorizes them (TODO/IDEA/QUESTION/REMINDER) via GPT-4o-mini, with AI-powered daily/weekly coaching audits.

    Python

  2. churn_prediction_music_box churn_prediction_music_box Public

    Calibrated churn-risk scoring + a unit-economics decision curve. Tells marketing what success rate clears break-even and what audience maximizes net retention value. Four models behind a unified in…

    Jupyter Notebook

  3. church_map church_map Public

    Python

  4. dialect_voice_memo_wechatApp dialect_voice_memo_wechatApp Public

    A wechat app with voice-enabled time tracking and content organization

    Python

  5. FoodSecurityPrediction FoodSecurityPrediction Public

    Data and code for replicating the AEPP paper "Machine learning for food security: Principles for transparency and usability"

    Python 12 8

  6. WD-Early-Warning-Food-Insecurity WD-Early-Warning-Food-Insecurity Public

    Data and Code for replicating the World Development paper "A Data-Driven Approach Improves Food Insecurity Crisis Prediction"

    R 1 1