Bases: BaseNodePostprocessor
NER PII Node processor.
Uses a HF transformers model.
Parameters:
| Name |
Type |
Description |
Default |
pii_node_info_key
|
str
|
|
'__pii_node_info__'
|
Source code in llama-index-core/llama_index/core/postprocessor/pii.py
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144 | class NERPIINodePostprocessor(BaseNodePostprocessor):
"""NER PII Node processor.
Uses a HF transformers model.
"""
pii_node_info_key: str = "__pii_node_info__"
@classmethod
def class_name(cls) -> str:
return "NERPIINodePostprocessor"
def mask_pii(self, ner: Callable, text: str) -> Tuple[str, Dict]:
"""Mask PII in text."""
new_text = text
response = ner(text)
mapping = {}
for entry in response:
entity_group_tag = f"[{entry['entity_group']}_{entry['start']}]"
new_text = new_text.replace(entry["word"], entity_group_tag).strip()
mapping[entity_group_tag] = entry["word"]
return new_text, mapping
def _postprocess_nodes(
self,
nodes: List[NodeWithScore],
query_bundle: Optional[QueryBundle] = None,
) -> List[NodeWithScore]:
"""Postprocess nodes."""
from transformers import pipeline # pants: no-infer-dep
ner = pipeline("ner", grouped_entities=True)
# swap out text from nodes, with the original node mappings
new_nodes = []
for node_with_score in nodes:
node = node_with_score.node
new_text, mapping_info = self.mask_pii(
ner, node.get_content(metadata_mode=MetadataMode.LLM)
)
new_node = deepcopy(node)
new_node.excluded_embed_metadata_keys.append(self.pii_node_info_key)
new_node.excluded_llm_metadata_keys.append(self.pii_node_info_key)
new_node.metadata[self.pii_node_info_key] = mapping_info
new_node.set_content(new_text)
new_nodes.append(NodeWithScore(node=new_node, score=node_with_score.score))
return new_nodes
|
mask_pii
mask_pii(ner: Callable, text: str) -> Tuple[str, Dict]
Mask PII in text.
Source code in llama-index-core/llama_index/core/postprocessor/pii.py
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118 | def mask_pii(self, ner: Callable, text: str) -> Tuple[str, Dict]:
"""Mask PII in text."""
new_text = text
response = ner(text)
mapping = {}
for entry in response:
entity_group_tag = f"[{entry['entity_group']}_{entry['start']}]"
new_text = new_text.replace(entry["word"], entity_group_tag).strip()
mapping[entity_group_tag] = entry["word"]
return new_text, mapping
|
