Datasets:
DOI:
License:
| license: cc-by-4.0 | |
| pretty_name: AtlasOpenCoder | |
| # AtlasOpenCoder — v1.0 | |
| Calibrated concept profiles for **OpenCoder-1.5B-Base**, read on 169 Python constructs across | |
| 61 pretraining and annealing checkpoints. This dataset is the battery, the licence tables and | |
| the artefacts every figure and table of two papers reads: | |
| * **"Calibrated Concept Profiles: Making the Reading of a Model's Neurons a Measurement"** | |
| (Wilam, 2026) — the method. Its code: `piotrwilam/AtlasCalibratedConceptProfiles`. | |
| * **"Representational Drift in a Code Model: Behaviour Settles, Which Neurons Carry It Does | |
| Not"** (Wilam, 2026) — the finding, read with that instrument on this dataset. | |
| Its code: `piotrwilam/AtlasRepresentationalDrift`. | |
| `MANIFEST_PAPER1.md` and `MANIFEST_PAPER2.md` below are named for the first and the second of | |
| those, in that order. | |
| ## What is here | |
| | | | | |
| |---|---| | |
| | `phase_battery/` | the battery: 557,990 prompts in sets A, B and C, two twins and the nu arm | | |
| | `battery/` | the earlier pilot battery | | |
| | `validation/` | every artefact a figure or table in either paper reads | | |
| | `inventory/`, `calibration/` | the 206 constructs and the corpus rate tables | | |
| | `probe/companions.json` | the logged companion shares | | |
| | `MANIFEST_PAPER1.md`, `MANIFEST_PAPER2.md` | every number in each paper, to its file, field and script | | |
| **The battery cannot be regenerated.** Its per-prompt seeds came from `abs(hash(...))`, salted | |
| per process, so the seeds recorded in `CONTENT_HASHES.json` do not reproduce the prompts they | |
| name. That is why it is published. | |
| ## What is not here | |
| **The raw record (2,022 GB over 61 references)** — per-core accumulators and per-prompt | |
| activations. It is regenerable from OpenCoder's released checkpoints, this battery and the | |
| code. One reference of it is planned for the next version. | |
| **The pilot recording.** Two artefacts were once computed from a pilot tree and later found to | |
| differ from the phase recording at every reference; everything derived from it is excluded and | |
| named in the papers. | |
| ## Two batteries, two hashes | |
| The **recorded** battery — the one the model was run on, and the one the papers' numbers come | |
| from — carries prompt-content hash `570b42db…`, and its per-set hashes are the figures the | |
| papers cite. | |
| The **released** battery differs from it in **1,927 of 557,990 prompts (0.35%)**: those prompts | |
| drew padding containing one of six third-party email addresses, which are replaced here with | |
| `user@example.com`. The token offsets each prompt stores are recomputed to match, and the | |
| recomputation is verified per prompt. See `phase_battery/REDACTION.json` and | |
| `phase_battery/RELEASED_HASHES.json`. | |
| Only a reader who re-runs the model on those 1,927 prompts sees a difference. Every artefact in | |
| `validation/` was computed on the recorded battery. | |
| ## Licence | |
| The dataset's own content (generator text, profiles, tables, artefacts) is **CC BY 4.0** (`LICENSE`); the padding snippets in the battery remain under their original licences, listed in `ATTRIBUTION.md`. | |
| **The padding is not ours.** Padding blocks were drawn from `codeparrot/codeparrot-clean` and | |
| carry the licences of the repositories they came from: MIT, Apache-2.0, BSD, GPL, AGPL, LGPL | |
| and others. Roughly **29% of prompts** contain at least one such fragment, each one to three | |
| lines and a median of 45 characters. Every block, its source repositories and their licences | |
| are listed in `ATTRIBUTION.md`. | |
| ## Citing | |
| Cite **the paper that owns this dataset, and the DOI together with the tag** — the method | |
| paper, named above. The dataset is its instrument and its realisation on OpenCoder; the | |
| second paper reads it. | |
| > Wilam, P. (2026). *Calibrated Concept Profiles: Making the Reading of a Model's Neurons a | |
| > Measurement.* Dataset: AtlasOpenCoder, tag `v1`. | |
| **The DOI is shown on this page, above the file list, and belongs in the citation beside the | |
| tag.** It is not repeated here: a DOI names the revision it was minted on, so a card cannot | |
| carry its own without pointing at a later revision than the one the DOI names. The paper's | |
| arXiv identifier is in the paper's own listing. | |
| A Hugging Face DOI is assigned **to the revision it is generated on**, so a later version takes | |
| a new DOI and the earlier one is marked outdated. Name the tag as well as the DOI: the tag says | |
| which content a number came from in words a reader can check against this repository's history. | |
| **Version 1 is the 20-cell yardstick** (4 token classes x 5 fifths of the prompt). A later | |
| version computed under a different yardstick names different neurons for the same constructs, | |
| so a figure from one version cannot be compared with a figure from another. | |
| ## What the directory names mean | |
| `validation/paper1/` and `validation/paper2/` record **which paper's script wrote a file, not | |
| which paper reads it**. Both papers read across them: the first paper's numbers come from 31 | |
| files under `validation/paper2/` and `validation/r2/`, and the second paper's from 14 under | |
| `validation/paper1/`. `MANIFEST_PAPER1.md` and `MANIFEST_PAPER2.md` in this repository give, for every number | |
| printed in each paper, the file and the field it is read from and the script that | |
| rebuilds that file -- 407 numbers and 495, including the few that no released file holds, | |
| which are marked and collected in a section of their own. | |
| ## Provenance | |
| The model is `OpenCoder-LLM/OpenCoder-1.5B-Base-Checkpoints` (MIT). The reference corpus is | |
| `codeparrot/codeparrot-clean`. The yardstick is the 20-cell split (4 token classes × 5 fifths | |
| of the prompt), version 1. | |