updated file open mode in cache writing

utils/llm_feat_utils.py

@@ -21,7 +21,7 @@ def _feat_hash(feature: str, text: str) -> str:
     blob = json.dumps({
         "version": CACHE_VERSION,
         "text": text,
-        "features": sorted(feature)
+        "features": feature
     }, sort_keys=True).encode()
     return hashlib.md5(blob).hexdigest()
 
@@ -105,8 +105,10 @@ def generate_feature_spans_cached(client, text: str, features: list[str], role:
         
         h = _feat_hash(feat, text)
         if h in cache:
+            print(f"Found feature: {feat}")
             result[feat] = cache[h]["spans"]
         else:
+            print(f"Missing feature: {feat}")
             missing_feats.append(feat)
 
     if missing_feats:
@@ -123,7 +125,7 @@ def generate_feature_spans_cached(client, text: str, features: list[str], role:
             result[feat] = spans
 
         # 5) write back the combined cache
-        with open(cache_path, "w") as f:
+        with open(cache_path, "a") as f:
             json.dump(cache, f, indent=2)
     return result