from llama_index.llms.deepseek import DeepSeek
llm = DeepSeek(model="deepseek-chat", api_key=os.getenv('DEEP_SEEK_API_KEY'))
Settings.llm = llm
Settings.embed_model = OpenAIEmbedding(model=self.embedding)
Settings.node_parser = node_parser
reranker = LLMRerank(top_n=self.similarity_top_k,)
nodes = reranker.postprocess_nodes(nodes, QueryBundle(f"Food items like {item_name}. Seperate item from adjectives and quantities.")