Tingyu Zhang

Thoughts on reinforcement learning, math, and engineering

Programmer in Imprisonment Problem

A thought for a logical problem

2 min read · March 11, 2026

2026 · Programming Logic Distributed System · Programming
"Anti-intuitive" High Dimension Geometry

Explain why the weight of high-dimension ball is distributed mainly on the shell and vectors are nearly mutually orthogonal.

3 min read · March 08, 2026

2026 · High-Dimension Probability Stochastic-Algorithm · Probability
a post with plotly.js

Trial for uploading PDF onto Blog.

1 min read · March 08, 2026

2026 · formatting charts · sample-posts
Understanding GRPO from numerical optimization

This is the pdf I used for illustrating what is GRPO from numerical optimization view.

1 min read · March 08, 2026

2026 · Optimization Numerical_Analysis DeepSeek_R1 · AI