| --- |
| pretty_name: llmdbg analysis artifacts |
| license: mit |
| tags: |
| - interpretability |
| - mechanistic-interpretability |
| - r-lens |
| - jacobian-lens |
| --- |
| |
| # llmdbg analysis artifacts |
|
|
| Versioned analysis data used by [llmdbg](https://github.com/liusida/llmdbg). |
|
|
| Method references: |
|
|
| - [Verbalizable Representations Form a Global Workspace in Language Models |
| (J-Lens)](https://transformer-circuits.pub/2026/workspace/index.html) |
| - [R-Lens: Making J-Lens More Faithful on Early |
| Layers](https://www.lesswrong.com/posts/nv8oedrnLXKRzNEL9/r-lens-making-j-lens-more-faithful-on-early-layers) |
|
|
| ## J-Lens |
|
|
| J-Lens artifacts contain averaged ordinary Jacobians from each residual layer |
| to the final residual layer. They are fitted with Anthropic's reference |
| `jacobian-lens` implementation, without the RelP backward-rule substitutions |
| used for R-Lens. |
|
|
| ## R-Lens |
|
|
| R-Lens artifacts contain a learned residual-transport matrix for each source |
| layer. Neuron Lens applies the appropriate transport to an MLP neuron's output |
| direction, then applies the target model's final normalization and |
| unembedding. |
|
|
| Each artifact directory contains: |
|
|
| - `manifest.json`: model compatibility, fitting provenance, tensor metadata, |
| and SHA-256 integrity information. |
| - `lens.safetensors`: matrices named `J.0`, `J.1`, and so on. |
|
|
| The catalog includes locally fitted 0.8B and 2B Base maps. Their manifests |
| explicitly allow compatible use with the corresponding Instruct checkpoints. |
| That Base-to-Instruct reuse is a convenience approximation; an artifact fitted |
| on the exact checkpoint is preferred for rigorous analysis. |
|
|
| The Qwen3.5 9B and 27B entries reference checkpoint-matched J-Lens and R-Lens |
| maps from the R-Lens authors' pinned |
| [`workspace-lenses`](https://huggingface.co/camilablank/workspace-lenses) |
| release. The catalog records the immutable revision, file size, and SHA-256; |
| llmdbg verifies the downloaded file before loading it. This avoids duplicating |
| roughly 8.7 GB while keeping artifact resolution reproducible. |
|
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|
