Update cross_encoder_reranking_train.py

cross_encoder_reranking_train.py

@@ -29,8 +29,8 @@ def rank_by_centrality(texts):
     return [text for text, _ in ranked]
 
 def cluster_and_rank(texts, threshold=0.75):
-    if len(texts) <= 3:
-        return texts  # Nothing to reduce
+    if len(texts) < 2:
+        return texts 
 
     embeddings = embed_text_list(texts)
     clustering = AgglomerativeClustering(n_clusters=None, distance_threshold=1-threshold, metric = "cosine", linkage='average')