FEAT: Add API for getting Neuronpedia feature

sae_lens/analysis/neuronpedia_integration.py

@@ -1,6 +1,7 @@
 import json
 import urllib.parse
 import webbrowser
+import requests
 
 
 def get_neuronpedia_quick_list(
@@ -14,10 +15,29 @@ def get_neuronpedia_quick_list(
     name = urllib.parse.quote(name)
     url = url + "?name=" + name
     list_feature = [
-        {"modelId": model, "layer": f"{layer}-{dataset}", "index": str(feature)}
+        {
+            "modelId": model,
+            "layer": f"{layer}-{dataset}",
+            "index": str(feature),
+        }
         for feature in features
     ]
     url = url + "&features=" + urllib.parse.quote(json.dumps(list_feature))
     webbrowser.open(url)
 
     return url
+
+
+def get_neuronpedia_feature(
+    feature: int,
+    layer: int,
+    model: str = "gpt2-small",
+    dataset: str = "res-jb",
+):
+    url = "https://neuronpedia.org/api/feature/"
+    url = url + f"{model}/{layer}-{dataset}/{feature}"
+
+    result = requests.get(url).json()
+    result["index"] = int(result["index"])
+
+    return result

tests/unit/analysis/test_neuronpedia_integration.py

@@ -0,0 +1,11 @@
+from sae_lens.analysis.neuronpedia_integration import get_neuronpedia_feature
+
+
+def test_get_neuronpedia_feature():
+    result = get_neuronpedia_feature(
+        feature=0, layer=0, model="gpt2-small", dataset="res-jb"
+    )
+
+    assert result["modelId"] == "gpt2-small"
+    assert result["layer"] == "0-res-jb"
+    assert result["index"] == 0