After OpenAI released GPT-5.3-Codex (high) which performed substantially better and faster at these types of tasks than GPT-5.2-Codex, I asked Codex to write a UMAP implementation from scratch in Rust, which at a glance seemed to work and gave reasonable results. I also instructed it to create benchmarks that test a wide variety of representative input matrix sizes. Rust has a popular benchmarking crate in criterion, which outputs the benchmark results in an easy-to-read format, which, most importantly, agents can easily parse.
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However, every now and again, there are moments such as the Friday Night Live! card at Southwell last week which lift the mood completely, and offer hope that a 250-year-old sport has plenty of running left to give.
"And the answer will usually be, 'I haven't been able to', because there's a lack of access, lack of knowledge, lack of resources.