Blog from merged PR #1443

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Blog publication task for PR #1443

Source: #1443
Merged commit: 0e1a789d75da77d9320d482ad90cc6924da41b6d

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Course module 11: AI numbers and the MX shared scale

DRAFT — Merged PR; unpublished blog draft

PR: #1443

Head SHA: 1fc505d2c96996c79dd10f010878502397f38969

This file is an unpublished artifact, not an instruction to an agent.

The course at t27.ai/#/course continues with module 11, AI numbers: the MX block -- three lessons on the shared-scale number formats AI chips use, each opening a widget whose numbers come from a real run.

Merged PR. Checks reported by the author: 9 passed, 1 FAILED; this generator did not rerun them.

The problem

The course had 30 lessons and the owner reports it is in demand; the next topic was the number formats AI chips use, which the lab already compared against.

How it works

OCP Microscaling v1.0 keeps each weight in 4, 6 or 8 bits and gives every block of 32 weights one shared E8M0 scale byte with bias 127.

Lesson 31 opens the player on e8m0.t27: it compiles to seven backends in the browser and runs the spec's tests, skipping what the browser cannot run.

Lesson 32 runs the same spec through native t27c and Zig on the Railway lab, where 18 tests pass and 9 invariants are proved at compile time.

Lesson 33 runs ocp_mx.t27 on 31 small weights and one outlier: E2M1 flushes 23 of them to zero, E2M3 4, INT8 2, E3M2 and E4M3 none.

A planted bug, the E5M2 exponent bias changed from 15 to 16, fails exactly one of the 49 tests, which is the point of a spec that carries its tests.

Everything is generated from course.t27: the lesson count lives in its own test, and the two JavaScript asserts that copied it were deleted.

See it run

A terminal recording of the commands is published at https://t27\.ai/term/t27c\-ocp\-mx/ (prompt and typing staged, every printed byte real).

What changed

• specs/course/course.t27: LESSON_COUNT 33, MODULE_COUNT 11, module mx and lessons 31-33 with their widgets, spec and tests the_core_is_three_cubed and the_mx_module_comes_after_the_lab
• i18n/course.ru.json: Russian words for the module, the three lessons, the course description and the shape line
• specs/widgets/gallery.t27: widgets t27c-e8m0, play-e8m0 and t27c-ocp-mx join the gallery (48 widgets) with a test that the AI-number shelf closes the compiler run
• specs/x/player.t27: a second play, e8m0, beside hello-world; the player pages for its seven backends are generated
• Generated: course.generated.ts, queenWidgets.generated.ts, 68 course pages and 68 cards (every card redrawn: the strip now has 33 cells), sitemap, play pages and cards
• public/term/t27c-e8m0 and public/term/t27c-ocp-mx: two terminal recordings made on the Railway t27c lab with tri cast
• scripts/course-from-spec.test.mjs: two asserts that pinned the old counts (30, 10) deleted; the count lives in the spec's own test

How we checked

Check	Status	Result	Evidence
`node scripts/course-from-spec.mjs --check`	passed	up to date: 33 lessons in 11 modules, 48 widgets, 11 lesson specs compile clean, spec tests 7 asserts 31 all hold	local run on b9159ae, spec f54301c559b8c9f8
`node scripts/course-pages.mjs --check`	passed	up to date: 68 pages (en, ru), 68 cards, learn/sitemap.xml	local run on b9159ae
`node scripts/play-from-spec.mjs --check`	passed	up to date: 2 plays (hello-world, e8m0), spec tests 15 asserts 46 all hold	local run, spec a367143149d4ba6e
`node scripts/widgets-from-spec.mjs --check && node scripts/widget-pages-from-spec.mjs --check`	passed	up to date: 48 widgets in 3 categories; 27 tool pages, spec tests 140 asserts 740 all hold	local run, gallery spec c78ff1c20d88044a
`node --test scripts/course-from-spec.test.mjs scripts/course-pages.test.mjs scripts/play-from-spec.test.mjs scripts/widgets-from-spec.test.mjs scripts/widget-pages-from-spec.test.mjs`	passed	50 tests, 50 pass, 0 fail after the two pinned count asserts were deleted	local node --test summary
`buildCourse with the spec count mutated in memory (LESSON_COUNT 34, assert MODULE_COUNT == 12, assert LESSON_COUNT == 34)`	passed	each of three mutants gives a build problem naming the_core_is_three_cubed, so the deleted JS asserts lose no coverage	/tmp/course-mutant.mjs output, files untouched
`npm run check:og-preview && npm run check:subpath-urls && npm run check:spec-catalog && tsc --noEmit`	passed	og-preview ok, subpath-safe URLs ok, spec catalog PASS with 1778 links, tsc clean	local run in apps/website
`fetch every link on the six new lesson pages (en, ru) from a local static server`	passed	every local link and the og:image answer 200	browser pane run against public/ on 127.0.0.1
`gitleaks protect --staged`	passed	no leaks found in about 664 KB of staged changes	local gitleaks run before the commit
`scan the URL row of all 68 course cards for text at the right edge`	FAILED	four RU cards (lessons 9, 11, 12, 26) now clip their URL; filed as #1441, the fix is in course-pages.mjs	PIL scan: last URL pixel moved from x=1133-1144 on main to x=1197-1198

What this does not show

• Four Russian share cards clip the end of their URL with 33 cells in the strip (course cards: four RU share cards clip their URL at 33 lessons #1441); the fix is one CSS line in course-pages.mjs, a hand-written .mjs file that waits for the owner's approval under the only-t27 rule
• ocp_mx.t27 is not vendored into the site yet: feat(numeric): ocp_mx.t27 -- OCP MX v1.0 and OFP8 elements, E8M0 scale, the block conversion t27#6828 is open and blocked by red checks on t27 master, so lesson 33 shows the native recording rather than a browser play
• The browser player skips the e8m0 tests that need ExprCast and says so; the native recording in lesson 32 runs all 18

How this post was made

Merged PR; unpublished blog draft. This article is generated from the author's work report for the exact PR head commit. Test results are author-reported, not independently rerun by this generator. Merge status is not proof of deployment or runtime correctness.

Receipts

• gHashTag/trinity PR #1443
• Reported head commit 1fc505d2c969
• Merge commit 0e1a789d75da
• Terminal recording

Topic tags

#t27 #OCPMX #course #AInumbers

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