refactor: Update retrievers.py to improve retriever configuration and naming conventions

libs/retrievers.py

@@ -12,7 +12,7 @@ from .config import FAISS_DB_INDEX, BM25_INDEX
 def load_bm25_retriever():
     with open(BM25_INDEX, "rb") as f:
         bm25_retriever = pickle.load(f)
-    return bm25_retriever
+    return bm25_retriever.with_config(run_name="BM25Retriever")
 
 
 def load_faiss_retriever(embeddings):
@@ -20,21 +20,19 @@ def load_faiss_retriever(embeddings):
         FAISS_DB_INDEX, embeddings, allow_dangerous_deserialization=True
     )
     faiss_retriever = faiss_db.as_retriever(search_type="mmr", search_kwargs={"k": 10})
-    return faiss_retriever
+    return faiss_retriever.with_config(run_name="FaissRetriever")
 
 
 def load_retrievers(embeddings):
-    faiss_retriever = load_faiss_retriever(embeddings).with_config(
-        run_name="FaissRetriever"
-    )
+    faiss_retriever = load_faiss_retriever(embeddings)
 
-    bm25_retriever = load_bm25_retriever().with_config(run_name="BM25Retriever")
+    bm25_retriever = load_bm25_retriever()
 
     ensemble_retriever = EnsembleRetriever(
         retrievers=[bm25_retriever, faiss_retriever],
         weights=[0.7, 0.3],
         search_type="mmr",
-    ).with_config(run_name="EnsembleRetriever")
+    )
 
     compressor = CohereRerank(model="rerank-multilingual-v3.0", top_n=5)
     compression_retriever = ContextualCompressionRetriever(