# bind2_0 — delta-rule backbone with a forced bottleneck

Gated-delta-rule backbone; the parameter-matching reference for the bind2_1 arms.

> Research artifact. Not a competition entry.

## What this is

A **frozen snapshot** of the code for one model generation. It is not a living repository: it is never updated after release. Files shared with another generation are duplicated here on purpose, so that the code closure is complete and nothing has to be fetched from a sibling package.

**Self-contained in code, not in data.** Every module the code imports ships here. Large or non-redistributable inputs -- corpora, official evaluation sets, token streams -- do not, and are listed under "Inputs you must supply" in `BUILD.md` with how to obtain or regenerate each. Do not read the completeness of `src/` as a claim that the package runs with no further downloads.

## Contents

| | count |
|---|---|
| source files (`src/`) | 2 |
| shipped data (`data/`) | 1 |
| externally-obtained inputs | 1 |

`MANIFEST.json` records, for every artifact, its original path in the working tree, its SHA-256, its size, and the git commit it came from. That is the traceability record: it is what lets you prove which state of the code produced a published result.

## External inputs (not redistributed here)

- `alaya-strict-small/tokens_u16.bin` — regenerable from the bind1 package's tokenizer chain

## Building and running

See `BUILD.md`. It states plainly what works, what does not, and why.

## Availability of this package

If a model card, paper or dataset page points at this package, that pointer must resolve for whoever reads it. A public card that links private code makes a reproducibility promise it cannot keep — and a licence line on unreachable code claims a release that has not happened. Before publishing any pointer to this package, confirm the package is actually reachable by the audience that will read the pointer.

## Licence

MIT (see `LICENSE`). Code only — model weights and evaluation artifacts are distributed separately and carry their own terms.