rohitg00--ai-engineering-from-scratch/CHANGELOG.md

Changelog

What's new in the curriculum. Most recent first.

Format loosely follows Keep a Changelog. Each entry names the phase, lesson, and what changed, so learners can jump straight to the delta.

Unreleased

Added

• scripts/scaffold-lesson.sh — scaffolder that creates phases/NN-phase/NN-lesson/ with the full folder structure and a docs/en.md skeleton prefilled from LESSON_TEMPLATE.md.
• .github/PULL_REQUEST_TEMPLATE.md — contributor checklist (code runs, no code comments, built-from-scratch-first, atomic per-lesson commit, markdown-link ROADMAP row).
• .github/ISSUE_TEMPLATE/bug_report.md and new_lesson_proposal.md — structured intake for bug reports and lesson pitches.
• This CHANGELOG.md.

2026-04 — Phase 4: Computer Vision complete

Added

• All 28 Phase 4 lessons, covering image fundamentals through multi-modal vision (VLMs, 3D, video, self-supervised).
• Phase 4 rows in ROADMAP.md linked as markdown to the lesson folders, so the website surfaces them.

Fixed

• Phase 4 precision pass across 15+ lessons:
  • phase-4/02: shape calculator specifies RF/stride handling for adaptive pool, flatten, and linear.
  • phase-4/03: backbone selector description lists all covered families; head guidance added for OCR, medical, industrial.
  • phase-4/04: classification diagnostics use quantitative thresholds per failure mode; n/a declared for undefined metrics; guard for fewer than 3 classes.
  • phase-4/06: detection metric reader uses AP@0.5 (not mAP@0.5); per-class recall declared optional; anchor designer clarifies stride truncation and single-anchor-per-level path.
  • phase-4/10: sampler picker declares unet_forward_ms as an input; ControlNet guard promoted to rule 0.
  • phase-4/14: ViT inspector aligned with refusal rule — port attempts are audited, not endorsed.
  • phase-4/24: open-vocab stack picker has explicit rule precedence and license-filter semantics; concept designer resolves step-5/rule-80 conflict.
  • phase-4/25: VLM docs _merge raises descriptive ValueError on placeholder mismatch; CMER normalises internally.
  • phase-4/27: synthetic_frames clips GT boxes to frame H/W.
  • phase-4/28: rope_3d validates dim split; dropped unused F import from DiT block example.

2026-Q1 and earlier

Added

• Phase 0 (Setup & Tooling): all 12 lessons.
• Phase 1 (Math Foundations): all 22 lessons.
• Phase 2 (ML Fundamentals): all 18 lessons.
• Phase 3 (Deep Learning Core): core lessons through perceptron, backprop, optimizers.
• Built-in Claude Code skills: find-your-level (placement quiz) and check-understanding (per-phase quiz).
• Website at aiengineeringfromscratch.com: catalog, per-lesson pages, roadmap, 277-term glossary.
• Initial scaffolding for all 20 phases (phases/00-* through phases/19-*).
• LESSON_TEMPLATE.md, CONTRIBUTING.md, ROADMAP.md, README.md.