chgagne/claude-skills-research

Comparing Papers

Overview

Puts a draft and its closest prior work side by side on the axes reviewers attack, with every cell traceable to a quoted sentence and the section it came from.

The tool gathers evidence; you draw the conclusion. It computes a note on exactly two axes — a training-scale ratio and a seed count — because those are arithmetic. On every other axis it shows two passages and stops. "These protocols differ" reads like a finding but is a judgement, and a tool that makes it will eventually make it wrongly in a document you sign your name to.

This automates the check reviewing-paper-sources/reference/claim-audit.md calls "baseline training scale vs its published scale", which otherwise means reading two appendices and doing a multiplication.

Run it

python3 ~/.claude/skills/comparing-papers/assets/run-compare.py . \
    --against "SNIP: Bridging Mathematical Symbolic and Numeric Realms" \
    --out review-assets/

# take the shortlist straight from a gap sweep
python3 ~/.claude/skills/comparing-papers/assets/run-compare.py . \
    --from-candidates review-assets/candidates.json --grade THREAT

Run by absolute path from the paper directory. Stdlib only. --against accepts a title, a DOI or an arXiv id and repeats; --limit caps how many papers are fetched (default 5).

Writes paper-comparison-<date>.md and comparison.json. Exit code 2 means some paper was reachable only as an abstract.

The acquisition ladder

1. arXiv e-print source  LaTeX, read with stdlib tarfile/gzip
2. arXiv PDF             via pdftotext, only if that binary is installed
3. open-access PDF       via OpenAlex oa_url, same caveat
4. abstract              degraded

LaTeX source leads for a reason. Training scale, seed counts and compute budgets live in appendices, and appendices are what PDF extraction mangles. Rung 1 needs no PDF parsing at all and keeps section headings exact. On the SNIP paper it yields 66 sections including "Pre-training Data Details"; the number the whole comparison turns on is in there.

A document that falls to rung 4 is marked degraded and the report says so, because "not found in the abstract" is not evidence of absence.

Numbers hide inside LaTeX math. SNIP writes its scale as $60$ million, the draft writes $10^5$ updates, and 1{,}000 is a thousands separator. Delimiters are stripped before any extraction — without that step every numeric pattern silently matches nothing.

Axes

Axis	Why a reviewer cares
problem	what the paper claims to solve
data	datasets and corpora
training_scale	a baseline retrained at a fraction of its published scale can manufacture the headline result
checkpoint	if an official checkpoint exists and was not evaluated, that is the first question asked
seeds	one seed means confidence intervals describe evaluation noise, not training variance
metrics	whether the comparison is like-for-like
results	the headline numbers
compute	the cost the method actually buys its quality with

training_scale prefers a stated total ("pre-trained on approximately 60 million examples") and otherwise multiplies updates by batch size, showing the arithmetic so you can check it.

Measured result

Benchmarked against a prior human review of the same draft, which found the scale gap by hand and graded it critical. The tool reproduces it from source text:

Axis	Draft	SNIP
training_scale	6.4M examples (100K updates × 64 batch), Optimization	60M examples (stated), Pre-training
seeds	"All variants are trained from scratch with training seed 0", Hyperparameter selection	—

with the computed note "6.4M vs 60M — about 11% of the other paper's scale", matching the review's 10.7%. 10 acceptance criteria, 68 offline tests.

Limits

• The descriptive axes are weaker than the numeric ones. problem, data and metrics find a relevant sentence, not necessarily the best one. Treat them as pointers into the text; treat training_scale, seeds and compute as findings.
• — means no sentence matched, not that the paper omits it. Check the source before reporting an absence.
• Release information is often not in the manuscript. SNIP's SNIP-10dmax checkpoint is public, but the string never appears in the paper — the checkpoint axis reports not found for it, correctly and unhelpfully. Look at the repository.
• Only what the paper wrote. If a protocol difference is never stated, no extractor finds it.
• Slowest of the three review skills: arXiv is throttled at 3s and e-print tarballs are large.

See also

• reference/axes.md — what each axis exposes and what to do with it
• reviewing-paper-sources — phase 4 (claim audit) and phase 0 offer this skill
• surveying-literature — produces the candidates.json shortlist this consumes