Update app.py

app.py

@@ -686,7 +686,7 @@ def create_embeddings(chunks):
 def retrieve_relevant_chunks(question, chunks, embeddings, top_k=3):
     """Retrieve most relevant chunks for a question"""
     if embedding_model is None or embeddings is None:
-        return chunks[:3] =
+        return chunks[:3]  # Fallback to first 3 chunks
     
     try:
         question_embedding = embedding_model.encode([question], show_progress_bar=False)