deltas: curated case-study MEMIT deltas (eiffel, taj mahal cf21243, pentium ii cf6467) + card

deltas/README.md

@@ -1,78 +1,51 @@
 # Curated case-study MEMIT deltas
 
-This directory holds dense per-layer weight deltas for the paper's three
-worked case-study edits, each applied on top of `google/gemma-2-2b` (base,
-gated, subject to the [Gemma Terms of Use](https://ai.google.dev/gemma/terms))
-with [MEMIT](https://rome.baulab.info/) via the Interp_Gemma editing
-primitives. Applying a delta to the base weights reconstructs the edited
-model `M_e = base google/gemma-2-2b weights + delta`.
+Weight *deltas* (not checkpoints) for the paper's three case-study edits on
+`google/gemma-2-2b`. Each `.npz` reconstructs the edited model as
 
-No model weights or edited checkpoints are included — only the delta, which
-is meaningless without the (separately downloaded, license-gated) base model.
-
-## Files
-
-| Case | Subject → target (relation) | CounterFact `case_id` | File | Size | SHA-256 |
-|---|---|---|---|---|---|
-| Eiffel Tower Paris→Rome | *The Eiffel Tower* is located in the city of **Rome** (was Paris) | 0 | `eiffel_paris_to_rome/deltas.npz` | 679,480,828 B (~648 MiB) | `476e5fb6a4f660faf5472fbaf0a2eefb2c4bb58bf0dfbb5e0ad50e3230f5507c` |
-| Pentium II Intel→Microsoft | *Pentium II* was developed by **Microsoft** (was Intel) | 6467 | `pentium_ii_intel_to_microsoft/deltas.npz` | 679,480,800 B (~648 MiB) | `380ab17ff6524e2273dc1f68019601baee4acd3b047f35bd1f0106adeadc44fa` |
-| Taj Mahal Islam→Christianity | *Taj Mahal* is follower of **Christianity** (was Islam) | 21243 | `taj_mahal_islam_to_christianity/deltas.npz` | 679,480,804 B (~648 MiB) | `adeec83a4af118b1c34c6e2216ed9839eed351dcc002dc038a48070b081e9ca9` |
+```
+M_e = base google/gemma-2-2b + delta
+```
 
-The Eiffel Tower case is the bundle backing `bundles/eiffel_paris_to_rome/`
-elsewhere in this dataset and the library's shipped example bundle
-(`circuit_diff/examples/bundles/eiffel/`). Pentium II and Taj Mahal are two
-of the 24 edits in the `cf-sweep-24` campaign (see `tables/cf-sweep-24/`);
-their `case_id`s match the `case_id` column in that campaign's
-`edits.csv` / `setdiff_rows.csv`.
+i.e. add each stored matrix to the identically-named base parameter. Base
+weights are NOT included — obtain `google/gemma-2-2b` from Google under the
+Gemma Terms of Use.
 
-This is a curated 3-edit subset chosen for the paper's case-study figures,
-not the full ~100-edit delta set used across the sweep campaigns; the full
-set is not planned for release but exists and can be shared on request.
+| File | Edit (subject → new object) | CounterFact case |
+|---|---|---|
+| `eiffel_paris_to_rome.npz` | "The Eiffel Tower is located in the city of" Paris → **Rome** | custom (case_id 0) |
+| `taj_mahal_cf21243.npz` | "Taj Mahal is follower of" → **Christianity** | cf21243 (P140) |
+| `pentium_ii_cf6467.npz` | "Pentium II was developed by" → **Microsoft** | cf6467 (P178) |
 
-## npz key structure
+## Format
 
-Each `deltas.npz` is a plain NumPy archive (`np.load(path)`) with:
+Each npz contains:
 
-- `meta` — a 0-d array wrapping a single JSON string. Fields: `edit_method`
-  (`"memit"`), `request` (the MEMIT edit request: `case_id`, `prompt`
-  template, `subject`, `target_new.str`), `band` (the list of 0-indexed
-  transformer layers MEMIT was allowed to edit), `base_model`
-  (`"google/gemma-2-2b"`).
-- `model.layers.{L}.mlp.down_proj.weight` for each `L` in `band` (here,
-  `L` in `3..10`, one array per layer) — the dense weight delta
-  `w_edited − w_base` for that layer's MLP down-projection, `float32`,
-  shape `(2304, 9216)` (gemma-2-2b's hidden size × MLP intermediate size).
-  MEMIT only ever touches this one weight matrix per edited layer, so these
-  eight arrays fully specify the edit.
+- `meta` — JSON string: `edit_method` (`memit`), the full edit `request`
+  (case_id, prompt template, subject, `target_new`), the edited layer `band`
+  (`[3..10]` for all three), and `base_model` (`google/gemma-2-2b`).
+- `model.layers.{L}.mlp.down_proj.weight` — one float32 delta matrix of
+  shape `(2304, 9216)` per layer `L` in the band.
 
-## Reconstruction recipe
+## Reconstruction
 
 ```python
-import json
-import numpy as np
-import torch
+import numpy as np, torch
 from transformers import AutoModelForCausalLM
 
-model = AutoModelForCausalLM.from_pretrained(
-    "google/gemma-2-2b", torch_dtype=torch.bfloat16
-)
-
-with np.load("eiffel_paris_to_rome/deltas.npz", allow_pickle=False) as z:
-    meta = json.loads(str(z["meta"]))
-    delta = {name: z[name] for name in z.files if name != "meta"}
-
-# w += delta, in place, cast to the weight's own dtype/device — this is
-# exactly circuit_diff/Interp_Gemma's interp_gemma.editing.deltas.apply_delta.
-with torch.no_grad():
-    for name, d in delta.items():
-        w = model.get_parameter(name)
-        w[...] += torch.as_tensor(d, dtype=w.dtype, device=w.device)
-
-# model is now M_e for this case; `meta["request"]` records what was edited.
+model = AutoModelForCausalLM.from_pretrained("google/gemma-2-2b")
+z = np.load("eiffel_paris_to_rome.npz")
+sd = model.state_dict()
+for k in z.files:
+    if k == "meta":
+        continue
+    sd[k] += torch.from_numpy(z[k]).to(sd[k].dtype)
+model.load_state_dict(sd)
 ```
 
-Applying the same delta a second time double-edits the model; applying it to
-anything other than an unmodified `google/gemma-2-2b` checkpoint does not
-reconstruct a meaningful edited model — `meta["base_model"]` records which
-base the delta was captured against, and callers should assert on it (as
-`interp_gemma.editing.deltas.reconstruct_into` does) before applying.
+## Scope
+
+Only these three case-study deltas are released. The full ~100-edit delta
+set behind the sweep tables exists (~69 GB) and can be shared on reasonable
+request; every delta is also recomputable with the Circuit-Diff repository's
+MEMIT wiring given the base model.

deltas/eiffel_paris_to_rome.npz

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+version https://git-lfs.github.com/spec/v1
+oid sha256:476e5fb6a4f660faf5472fbaf0a2eefb2c4bb58bf0dfbb5e0ad50e3230f5507c
+size 679480828

deltas/pentium_ii_cf6467.npz

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:380ab17ff6524e2273dc1f68019601baee4acd3b047f35bd1f0106adeadc44fa
+size 679480800

deltas/taj_mahal_cf21243.npz

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:adeec83a4af118b1c34c6e2216ed9839eed351dcc002dc038a48070b081e9ca9
+size 679480804