---
license: mit
pretty_name: probe-inference parity fixture
---

# probe-inference parity fixture

Test fixture for the `probe-inference` package's parity tests (`tests/test_parity.py`). The tests
download this dataset at a pinned revision and check that the package reproduces reference scores on
real activations.

For each model it holds a few rows of residual-stream activations and token masks, and the reference
score of each probe on each row. It holds no probes: the tests load them from
[`AlignmentResearch/probe-inference-weights`](https://huggingface.co/AlignmentResearch/probe-inference-weights)
at the package's pinned revision, exactly as users do.

| Directory | Model | Rows | Probes |
|---|---|---|---|
| `nemotron-3-super-120b/` | `nvidia/NVIDIA-Nemotron-3-Super-120B-A12B-BF16` | 80 | EFC, axial |
| `qwen3.5-9b/` | `Qwen/Qwen3.5-9B` | 32 | linear, MLP, EFC, axial |

Files in each model directory:

- `acts.pt`: `{layer: Tensor[rows, seq, d_model]}` in bfloat16, the outputs of decoder block `layer`
  (Hugging Face `hidden_states[layer + 1]`), over each row's follow-up window.
- `masks.pt`: `tokens`, `prompt_mask`, `completion_mask` and `followup_start_positions` for the same rows.
- `reference.json`: per probe, `score` (EFC, axial), or `L<layer>` logits plus `combined` (the mean of
  per-layer sigmoids) for linear and MLP, one value per row.

`manifest.json` lists the sets and, for each, the probes' paths in the weights repository (for example
`qwen3.5-9b/efc`). The Nemotron rows mix two follow-up lengths, so a batch has ragged read windows (27
and 24 tokens).

## Licences and attribution

The test data and this card are released by FAR AI, Inc. under the MIT licence (`LICENSE`).

They are derived from the models below (this fixture uses Qwen/Qwen3.5-9B and
nvidia/NVIDIA-Nemotron-3-Super-120B-A12B-BF16). Both upstream licences let us license derived works under our own
terms provided we include their licence texts and keep their attribution notices, so both ship here
unchanged (see `NOTICE`):

| Model | Licence | Licence file |
|---|---|---|
| Qwen/Qwen3.5-2B, Qwen/Qwen3.5-9B, Qwen/Qwen3.6-27B, Qwen/Qwen3.5-122B-A10B, Qwen/Qwen3.5-397B-A17B | Apache-2.0 | `LICENSE-QWEN-APACHE-2.0.txt` |
| nvidia/NVIDIA-Nemotron-3-Nano-30B-A3B-BF16, nvidia/NVIDIA-Nemotron-3-Super-120B-A12B-BF16 | NVIDIA Nemotron Open Model License (v. December 15, 2025) | `LICENSE-NVIDIA-NEMOTRON-OPEN-MODEL.txt` |

Licensed by NVIDIA Corporation under the NVIDIA Nemotron Model License.