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相似度

节点后处理器模块。

SimilarityPostprocessor #

基础：BaseNodePostprocessor

基于相似度的节点处理器。

参数

名称 类型 描述 默认值
similarity_cutoff float
0.0
源码位于 llama-index-core/llama_index/core/postprocessor/node.py 
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class SimilarityPostprocessor(BaseNodePostprocessor):
    """Similarity-based Node processor."""

    similarity_cutoff: float = Field(default=0.0)

    @classmethod
    def class_name(cls) -> str:
        return "SimilarityPostprocessor"

    def _postprocess_nodes(
        self,
        nodes: List[NodeWithScore],
        query_bundle: Optional[QueryBundle] = None,
    ) -> List[NodeWithScore]:
        """Postprocess nodes."""
        sim_cutoff_exists = self.similarity_cutoff is not None

        new_nodes = []
        for node in nodes:
            should_use_node = True
            if sim_cutoff_exists:
                similarity = node.score
                if similarity is None:
                    should_use_node = False
                elif cast(float, similarity) < cast(float, self.similarity_cutoff):
                    should_use_node = False

            if should_use_node:
                new_nodes.append(node)

        return new_nodes