Upload utils.py

utils.py

@@ -0,0 +1,21 @@
+# utils.py
+from typing import Dict, Set
+
+def text_blob(b: Dict) -> str:
+    parts = [
+        b.get("title", ""),
+        b.get("authors", ""),
+        b.get("categories", ""),
+        b.get("subjects", ""),
+        b.get("description", "")
+    ]
+    return " | ".join(p for p in parts if p)
+
+def _to_tagset(s: str) -> Set[str]:
+    return {t.strip().lower() for t in (s or "").split(";") if t.strip()}
+
+def jaccard(a: str, b: str) -> float:
+    A, B = _to_tagset(a), _to_tagset(b)
+    if not A or not B:
+        return 0.0
+    return len(A & B) / len(A | B)