feat: Update rerankers to their latest version. (#42)

Signed-off-by: wxywb <xy.wang@zilliz.com>

milvus_model/reranker/cohere.py

@@ -7,19 +7,23 @@
 import cohere
 
 class CohereRerankFunction(BaseRerankFunction):
-    def __init__(self, model_name: str = "rerank-english-v2.0", api_key: Optional[str] = None):
+    def __init__(self, model_name: str = "rerank-english-v3.0", api_key: Optional[str] = None, return_documents=True, **kwargs):
         self.model_name = model_name
-        self.client = cohere.Client(api_key)
+        self.client = cohere.ClientV2(api_key)
+        self.rerank_config = {"return_documents": return_documents, **kwargs} 
+
 
     def __call__(self, query: str, documents: List[str], top_k: int = 5) -> List[RerankResult]:
         co_results = self.client.rerank(
-            query=query, documents=documents, top_n=top_k, model="rerank-english-v2.0"
-        )
+            query=query, documents=documents, top_n=top_k, model=self.model_name, **self.rerank_config)
         results = []
         for co_result in co_results.results:
+            document_text = ""
+            if self.rerank_config["return_documents"] is True:
+                document_text = co_result.document.text
             results.append(
                 RerankResult(
-                    text=co_result.document["text"],
+                    text=document_text,
                     score=co_result.relevance_score,
                     index=co_result.index,
                 )

milvus_model/reranker/jinaai.py

@@ -9,7 +9,7 @@
 
 
 class JinaRerankFunction(BaseRerankFunction):
-    def __init__(self, model_name: str = "jina-reranker-v1-base-en", api_key: Optional[str] = None):
+    def __init__(self, model_name: str = "jina-reranker-v2-base-multilingual", api_key: Optional[str] = None):
         if api_key is None:
             if "JINAAI_API_KEY" in os.environ and os.environ["JINAAI_API_KEY"]:
                 self.api_key = os.environ["JINAAI_API_KEY"]

milvus_model/reranker/voyageai.py

@@ -7,7 +7,7 @@
 import voyageai
 
 class VoyageRerankFunction(BaseRerankFunction):
-    def __init__(self, model_name: str = "rerank-lite-1", api_key: Optional[str] = None):
+    def __init__(self, model_name: str = "rerank-2", api_key: Optional[str] = None):
         self.model_name = model_name
         self.client = voyageai.Client(api_key=api_key)
 

milvus_model/utils/__init__.py

@@ -60,7 +60,7 @@ def import_unidic_lite():
     _check_library("unidic-lite", package="unidic-lite")
 
 def import_cohere():
-    _check_library("cohere", "cohere")
+    _check_library("cohere", "cohere>=5.10.0")
 
 def import_voyageai():
     _check_library("voyageai", "voyageai>=0.2.0")