feat: support ollama rerank

--story=1017862 --user=王孝刚 希望支持在 Ollama 中添加 rerank 模型 issue#2243 https://www.tapd.cn/57709429/s/1655139

apps/application/swagger_api/chat_api.py

@@ -165,7 +165,15 @@ class ChatApi(ApiMixin):
                 openapi.Parameter(name='min_trample', in_=openapi.IN_QUERY, type=openapi.TYPE_INTEGER, required=False,
                                   description=_("Minimum number of clicks")),
                 openapi.Parameter(name='comparer', in_=openapi.IN_QUERY, type=openapi.TYPE_STRING, required=False,
-                                  description=_("or|and comparator"))
+                                  description=_("or|and comparator")),
+                openapi.Parameter(name='start_time', in_=openapi.IN_QUERY,
+                                  type=openapi.TYPE_STRING,
+                                  required=True,
+                                  description=_('start time')),
+                openapi.Parameter(name='end_time', in_=openapi.IN_QUERY,
+                                  type=openapi.TYPE_STRING,
+                                  required=True,
+                                  description=_('End time')),
                 ]
 
 

apps/setting/models_provider/impl/ollama_model_provider/credential/reranker.py

@@ -0,0 +1,67 @@
+# coding=utf-8
+"""
+    @project: MaxKB
+    @Author：虎
+    @file： embedding.py
+    @date：2024/7/12 15:10
+    @desc:
+"""
+from typing import Dict
+
+from django.utils.translation import gettext as _
+
+from common import forms
+from common.exception.app_exception import AppApiException
+from common.forms import BaseForm
+from setting.models_provider.base_model_provider import BaseModelCredential, ValidCode
+from setting.models_provider.impl.ollama_model_provider.model.reranker import OllamaReranker
+from langchain_core.documents import BaseDocumentCompressor, Document
+from django.utils.translation import gettext_lazy as _, gettext
+
+
+class OllamaReRankModelCredential(BaseForm, BaseModelCredential):
+    def is_valid(self, model_type: str, model_name, model_credential: Dict[str, object], model_params, provider,
+                 raise_exception=False):
+        if not model_type == 'RERANKER':
+            raise AppApiException(ValidCode.valid_error.value,
+                                  gettext('{model_type} Model type is not supported').format(model_type=model_type))
+        model_type_list = provider.get_model_type_list()
+        if not any(list(filter(lambda mt: mt.get('value') == model_type, model_type_list))):
+            raise AppApiException(ValidCode.valid_error.value,
+                                  _('{model_type} Model type is not supported').format(model_type=model_type))
+        try:
+            model_list = provider.get_base_model_list(model_credential.get('api_base'))
+        except Exception as e:
+            raise AppApiException(ValidCode.valid_error.value, _('API domain name is invalid'))
+        exist = [model for model in (model_list.get('models') if model_list.get('models') is not None else []) if
+                 model.get('model') == model_name or model.get('model').replace(":latest", "") == model_name]
+        if len(exist) == 0:
+            raise AppApiException(ValidCode.model_not_fount,
+                                  _('The model does not exist, please download the model first'))
+
+        try:
+            model: OllamaReranker = provider.get_model(model_type, model_name, model_credential)
+            model.compress_documents([Document(page_content=gettext('Hello'))], gettext('Hello'))
+        except Exception as e:
+            if isinstance(e, AppApiException):
+                raise e
+            if raise_exception:
+                raise AppApiException(ValidCode.valid_error.value,
+                                      gettext(
+                                          'Verification failed, please check whether the parameters are correct: {error}').format(
+                                          error=str(e)))
+            else:
+                return False
+        return True
+
+    def encryption_dict(self, model_info: Dict[str, object]):
+        return model_info
+
+    def build_model(self, model_info: Dict[str, object]):
+        for key in ['model']:
+            if key not in model_info:
+                raise AppApiException(500, _('{key}  is required').format(key=key))
+        return self
+
+    api_base = forms.TextInputField('API URL', required=True)
+    api_key = forms.TextInputField('API Key', required=True)

apps/setting/models_provider/impl/ollama_model_provider/model/reranker.py

@@ -0,0 +1,82 @@
+from typing import Sequence, Optional, Any, Dict
+from langchain_core.callbacks import Callbacks
+from langchain_core.documents import BaseDocumentCompressor, Document
+import requests
+
+from setting.models_provider.base_model_provider import MaxKBBaseModel
+
+
+class OllamaReranker(MaxKBBaseModel, BaseDocumentCompressor):
+    api_base: Optional[str]
+    """URL of the Ollama server"""
+    model_name: Optional[str]
+    """The model name to use for reranking"""
+    api_key: Optional[str]
+
+    @staticmethod
+    def new_instance(model_name, model_credential: Dict[str, object], **model_kwargs):
+        return OllamaReranker(api_base=model_credential.get('api_base'), model_name=model_name,
+                              api_key=model_credential.get('api_key'), top_n=model_kwargs.get('top_n', 3))
+
+    top_n: Optional[int] = 3
+
+    def __init__(
+            self, api_base: Optional[str] = None, model_name: Optional[str] = None, top_n=3,
+            api_key: Optional[str] = None
+    ):
+        super().__init__()
+
+        if api_base is None:
+            raise ValueError("Please provide server URL")
+
+        if model_name is None:
+            raise ValueError("Please provide the model name")
+
+        self.api_base = api_base
+        self.model_name = model_name
+        self.api_key = api_key
+        self.top_n = top_n
+
+    def compress_documents(self, documents: Sequence[Document], query: str, callbacks: Optional[Callbacks] = None) -> \
+            Sequence[Document]:
+        """
+        Given a query and a set of documents, rerank them using Ollama API.
+        """
+        if not documents or len(documents) == 0:
+            return []
+
+        # Prepare the data to send to Ollama API
+        headers = {
+            'Authorization': f'Bearer {self.api_key}'  # Use API key for authentication if required
+        }
+
+        # Format the documents to be sent in a format understood by Ollama's API
+        documents_text = [document.page_content for document in documents]
+
+        # Make a POST request to Ollama's rerank API endpoint
+        payload = {
+            'model': self.model_name,  # Specify the model
+            'query': query,
+            'documents': documents_text,
+            'top_n': self.top_n
+        }
+
+        try:
+            response = requests.post(f'{self.api_base}/v1/rerank', headers=headers, json=payload)
+            response.raise_for_status()
+            res = response.json()
+
+            # Ensure the response contains expected results
+            if 'results' not in res:
+                raise ValueError("The API response did not contain rerank results.")
+
+            # Convert the API response into a list of Document objects with relevance scores
+            ranked_documents = [
+                Document(page_content=d['text'], metadata={'relevance_score': d['relevance_score']})
+                for d in res['results']
+            ]
+            return ranked_documents
+
+        except requests.exceptions.RequestException as e:
+            print(f"Error during API request: {e}")
+            return []  # Return an empty list if the request failed

apps/setting/models_provider/impl/ollama_model_provider/ollama_model_provider.py

@@ -18,9 +18,11 @@ from setting.models_provider.base_model_provider import IModelProvider, ModelPro
 from setting.models_provider.impl.ollama_model_provider.credential.embedding import OllamaEmbeddingModelCredential
 from setting.models_provider.impl.ollama_model_provider.credential.image import OllamaImageModelCredential
 from setting.models_provider.impl.ollama_model_provider.credential.llm import OllamaLLMModelCredential
+from setting.models_provider.impl.ollama_model_provider.credential.reranker import OllamaReRankModelCredential
 from setting.models_provider.impl.ollama_model_provider.model.embedding import OllamaEmbedding
 from setting.models_provider.impl.ollama_model_provider.model.image import OllamaImage
 from setting.models_provider.impl.ollama_model_provider.model.llm import OllamaChatModel
+from setting.models_provider.impl.ollama_model_provider.model.reranker import OllamaReranker
 from smartdoc.conf import PROJECT_DIR
 from django.utils.translation import gettext as _
 
@@ -153,12 +155,19 @@ model_info_list = [
 ]
 ollama_embedding_model_credential = OllamaEmbeddingModelCredential()
 ollama_image_model_credential = OllamaImageModelCredential()
+ollama_reranker_model_credential = OllamaReRankModelCredential()
 embedding_model_info = [
     ModelInfo(
         'nomic-embed-text',
         _('A high-performance open embedding model with a large token context window.'),
         ModelTypeConst.EMBEDDING, ollama_embedding_model_credential, OllamaEmbedding),
 ]
+reranker_model_info = [
+    ModelInfo(
+        'ollama:reranker',
+        '',
+        ModelTypeConst.RERANKER, ollama_reranker_model_credential, OllamaReranker),
+]
 
 image_model_info = [
     ModelInfo(
@@ -189,6 +198,8 @@ model_info_manage = (
         ModelTypeConst.EMBEDDING, ollama_embedding_model_credential, OllamaEmbedding), )
     .append_model_info_list(image_model_info)
     .append_default_model_info(image_model_info[0])
+    .append_model_info_list(reranker_model_info)
+    .append_default_model_info(reranker_model_info[0])
     .build()
 )