William
Chang

Two-wheeled robots shoving each other out of a ring. Small neural nets trained by evolution strategies and self-play. Drive one yourself and try to beat each level.

A chess engine that learned its own piece values by playing itself, starting from all pieces equal. Play against any of its four levels.

Drop in a song and get a simplified piano arrangement: the chords, the melody and sheet music you can play. Beat, chord and melody detection run in your browser.

Sing six notes and a few words, pick any song, and hear its melody sung back in your own voice. Pitch shifting by PSOLA, all in the browser.

Pull the singer out of a song, right in your browser: drop in a track and get the voice and the backing as separate files. No training data, nothing uploaded.

Load a song, paste timestamped lyrics (or tap along to time them), and turn them into an animated lyric video whose scene follows the song's mood, read by a small model that runs in your browser. Exports the finished video.

Drop in a CSV and find the problems that quietly break machine-learning models: leaking columns, test rows copied from training, contradictory labels, hidden placeholders. Then download the fix.

When a multi-step LLM pipeline gets an answer wrong, find which step caused it. Swap steps for better versions with the randomness held fixed, and watch Shapley values split the blame.

Race bandit algorithms against the Lai–Robbins lower bound in your browser, and plan an A/B test: see whether a fixed split or Thompson sampling costs fewer conversions.

See how far to trust a classifier: honest confidence, prediction sets with a coverage guarantee, abstention with a certified error rate and drift alarms. Try it on three models or your own CSV.

Five ideas from ML theory you can play with in the browser: double descent, high-dimensional geometry, diffusion models that copy their training data, private polls and certified robustness.

A shared bucket list sorted like ski runs, from easy nights in to passport trips. Make an account, start a list and invite people to it.

Describe a math figure in words and get an interactive one you can rotate, slice and share. Starts with a drilled sphere, solids of revolution, Riemann sums and more.