Update app.py

app.py

@@ -64,12 +64,14 @@ local_model_path = snapshot_download(repo_id=MODEL_NAME, cache_dir=cache_dir)
 embeddings = SentenceTransformer(local_model_path, cache_folder=cache_dir)
 
 # Pre-initialize fallback global models for small-batch debugging
-# Global UMAP: 2-neighbors, cosine space, random init(
+# Global UMAP: 2-neighbors, cosine space, random init
+global_umap = UMAP(
     n_neighbors=2,
     metric="cosine",
     init="random",
     random_state=42
 )
+
 # Global HDBSCAN: min cluster size 2, min_samples 1, cosine metric
 global_hdbscan = HDBSCAN(
     min_cluster_size=2,