reducto/table-judge-benchmark

Benchmark design

The benchmark contains 538 paired clean/corrupted examples:

Error type	Cases	Corruption
Content: numeric	90	Change one numeric body-cell value
Content: typo	90	Transpose two adjacent, distinct Unicode letters in one body cell
Formatting	179	Bold and italicize letter-containing cells in one body row
Structure	179	Remove one row
Total	538	One fixed corruption per table

Corruption rules

Text typos never modify headers, tags, or HTML entities. The injector finds the longest eligible contiguous sequence of visible Unicode letters in a body cell, transposes one adjacent pair of distinct letters near its center, and changes only that occurrence.

Formatting corruptions never modify <th> cells or numeric-only, symbol-only, punctuation-only, or empty cells. The injector selects the body row with the most eligible <td> cells and applies bold italics only to cells containing visible letters.

Selected formatting subset	Cases
Every targeted cell starts plain	159
At least one target is already bold	17
Every target is already bold, so the effective addition is italics	10
At least one target is already italic	4

The groups overlap. No target is already both bold and italic, no selected <td> has an existing inline style attribute, every target contains a Unicode letter, and every counterpart changes rendered emphasis. Two cases include the literal alphabetic placeholder [symbol]; they satisfy the selection rule but are not used as qualitative examples.

error-type-assignments.json freezes both assignment order and top-level error type. The order keeps the 90/90 numeric-versus-typo split stable even when public filenames differ from internal identifiers.

Rebuild and inspect

Rebuild all corruptions in a new directory without making API calls:

uv run python scripts/build_benchmark.py --output-dir /tmp/table-judge-benchmark

Render one clean or corrupted HTML file:

uv run --extra render python scripts/render_html.py \
  data/benchmark/corrupted_html/chinese_finepdf_00008946_page_44_block_5_unexpected_bold_italic_row.html \
  /tmp/corrupted-table.png

The renderer uses WeasyPrint, PDFium, and Pillow, crops whitespace, and caps output at 1,505,280 pixels. It renders <th> cells bold and <td> cells at regular weight. Font and native-library differences can change exact pixels across operating systems.

Verify the checked-in manifest and 8,608-call plan without credentials or charges:

uv run table-judge-run \
  --models gpt-5.4 gpt-5.5 claude-opus-4-7 claude-opus-4-8 \
    gemini-3.1-pro-preview gpt-5.6-sol gpt-5.6-terra gpt-5.6-luna \
  --manifest data/benchmark/manifest.jsonl \
  --output /tmp/plan.jsonl \
  --dry-run

Data limitations

• The benchmark covers synthetic numeric, text, row-removal, and emphasis errors rather than the full space of table transcription failures.
• Error types are globally balanced, but language strata are not.
• Filename-derived language is a coarse provenance proxy, and some tables contain multiple languages.