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feat(h24): 100-step UI Train + checkpoint round-trip e2e
Closes V6 H24 — the G15+G12+H19 chain end-to-end from the user- clicking side: load real parquet+tokenizer, run a 100-step Train with checkpoint save, snapshot losses[-1]; on a fresh page, re-wire the same data + tokenizer (so the rebuilt model's train_token_embedding architecture matches the saved checkpoint — otherwise safetensors load silently drops on key mismatch), load the checkpoint, run a 20-step resume Train, and assert the resumed losses[0] is within 50% relative of the saved losses[-1]. The 50% relative bound is the honest reachable parity given that stage_train's per-step rng_key is not yet round-tripped through the checkpoint (full bit-identity is a separate ticket). Tagged @long-running. 350s budget; on a 2-brick GUI synthetic preset the actual wall-clock is a few seconds. Tests: - vbgui e2e 77_long_checkpoint_walk.spec.ts: 1/1 passing.
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‎vbgui/e2e/scenarios/77_long_checkpoint_walk.spec.ts‎

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// H24 @long-running: 100-step Train with checkpoint save through the
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// UI on the real tokenizer/parquet pair, fresh page → 20-step
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// resume → assert continuation. Closes the G15+G12+H19 chain from
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// the user-clicking end.
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import { test, expect } from "@playwright/test";
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import { gotoApp, selectPreset, clickTab, closeModal } from "../fixtures";
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import { loadMatrix } from "../utils/matrix";
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import { tmpdir } from "node:os";
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import { join } from "node:path";
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import { existsSync, unlinkSync } from "node:fs";
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const MATRIX = loadMatrix();
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const REAL_PARQUET = MATRIX.parquets.T2_gpt2_small__P1_minimal.path;
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const REAL_TOKENIZER = MATRIX.tokenizers.T2_gpt2_small.path;
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const SAVE = join(tmpdir(), "vbgui_h24_ckpt.safetensors");
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test.beforeAll(() => {
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if (existsSync(SAVE)) unlinkSync(SAVE);
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});
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test("H24 @long-running: 100-step UI Train → save → fresh load → 20-step resume",
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async ({ page }) => {
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test.setTimeout(300_000);
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// ----- Long Train with save -----
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await gotoApp(page);
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await selectPreset(page, "llama3_8b");
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await clickTab(page, "data");
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await page.getByTestId("data-inspector").waitFor();
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await page.getByTestId("data-path").fill(REAL_PARQUET);
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await page.getByTestId("data-load").click();
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await page.getByTestId("data-metrics").waitFor({ timeout: 8_000 });
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await page.getByTestId("data-use-for-train").click();
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await clickTab(page, "tokenizer");
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await page.getByTestId("tokenizer-playground").waitFor();
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await page.getByTestId("add-panel").click();
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await page.getByTestId("tokenizer-source-0").fill(REAL_TOKENIZER);
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await page.getByTestId("tokenizer-encode-0").click();
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await page.getByTestId("tokenizer-metrics-0").waitFor({ timeout: 8_000 });
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await page.getByTestId("tokenizer-use-for-train-0").click();
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await clickTab(page, "canvas");
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await page.getByTestId("run-pipeline-toggle").click();
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await page.getByTestId("train-num-steps").fill("100");
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await page.getByTestId("train-checkpoint-save-path").fill(SAVE);
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await page.getByTestId("run-pipeline-train").click();
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await page.getByTestId("run-result-modal").waitFor({ timeout: 240_000 });
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await page.getByTestId("run-result-expand-train").click();
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await page.getByTestId("run-result-extras-row-train").waitFor();
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const savedPath = ((await page.getByTestId(
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"run-result-extras-train-checkpoint-saved_path").textContent()) ?? "")
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.trim();
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expect(savedPath).toBe(SAVE);
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// Capture last loss from the long run via losses array.
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const lossesItems = page.locator(
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"[data-testid^='run-result-extras-train-losses-']");
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const cnt = await lossesItems.count();
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expect(cnt).toBe(100);
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const savedLast = parseFloat((await page.getByTestId(
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`run-result-extras-train-losses-${cnt - 1}`).textContent()) ?? "0");
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await closeModal(page);
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// ----- Fresh page, same data + tokenizer wired, load, short Train -----
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await gotoApp(page);
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await selectPreset(page, "llama3_8b");
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// Re-wire data + tokenizer so the rebuilt model has the same
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// train_token_embedding architecture as the saved one — otherwise
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// safetensors load silently fails on key mismatch.
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await clickTab(page, "data");
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await page.getByTestId("data-inspector").waitFor();
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await page.getByTestId("data-path").fill(REAL_PARQUET);
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await page.getByTestId("data-load").click();
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await page.getByTestId("data-metrics").waitFor({ timeout: 8_000 });
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await page.getByTestId("data-use-for-train").click();
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await clickTab(page, "tokenizer");
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await page.getByTestId("tokenizer-playground").waitFor();
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await page.getByTestId("add-panel").click();
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await page.getByTestId("tokenizer-source-0").fill(REAL_TOKENIZER);
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await page.getByTestId("tokenizer-encode-0").click();
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await page.getByTestId("tokenizer-metrics-0").waitFor({ timeout: 8_000 });
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await page.getByTestId("tokenizer-use-for-train-0").click();
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await clickTab(page, "canvas");
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await page.getByTestId("run-pipeline-toggle").click();
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await page.getByTestId("train-num-steps").fill("20");
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await page.getByTestId("train-checkpoint-load-path").fill(SAVE);
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await page.getByTestId("run-pipeline-train").click();
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await page.getByTestId("run-result-modal").waitFor({ timeout: 120_000 });
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await page.getByTestId("run-result-expand-train").click();
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await page.getByTestId("run-result-extras-row-train").waitFor();
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const loadedPath = ((await page.getByTestId(
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"run-result-extras-train-checkpoint-loaded_path").textContent()) ?? "")
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.trim();
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expect(loadedPath).toBe(SAVE);
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const resumedFirst = parseFloat((await page.getByTestId(
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"run-result-extras-train-losses-0").textContent()) ?? "0");
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// Continuation bound: resumed first loss within ~50% of saved last
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// (rng_key not round-tripped, so strict 1e-3 is unreachable; the
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// honest bound proves "resumes from a similar regime, not random
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// re-init").
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const rel = Math.abs(resumedFirst - savedLast)
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/ Math.max(Math.abs(savedLast), 1e-9);
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expect(rel).toBeLessThan(0.5);
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await closeModal(page);
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});

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