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JSLab is out: write code, watch it run as you type

JSLab is available today for Apple Silicon Macs running macOS 14 or later. It's a native JavaScript and TypeScript scratchpad.

  • JSLab simplifies JavaScript/TypeScript coding on Apple Silicon Macs
  • Code executes and displays output instantly as you type
  • Supports multiple runtimes, npm packages, and AI-assisted code review

Cross-validation, and the split that hides a model's failure

Cross-validation is how most models get their score. Six points worked through by hand show how k-fold works, and how the same model scores 0.80 or −0.67 depending only on how the data was split.

  • Cross-validation assesses model performance by splitting data into folds.
  • Hidden flaw: model scores higher when tested on data it saw during training.
  • Group-based cross-validation prevents overfitting to specific data groups.

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