Create reranker.py

reranker.py

@@ -0,0 +1,7 @@
+from llama_index.postprocessor.cohere_rerank import CohereRerank
+
+def reranker(cohere_key):
+    # Define the Cohere Reranking object to return only the first two highest ranking chunks.
+    cohere_rerank3 = CohereRerank(top_n=2, api_key=cohere_key,model = 'rerank-english-v3.0')
+    return cohere_rerank3
+