Enum RelEngine 

pub enum RelEngine {
    ModelBased(ModelBasedRelEngine),
    Heuristic,
}

Relation extraction engine — fully local, no external API calls.

Extraction tiers:

• Model-based: GLiNER multitask ONNX model for typed relation extraction.
• Heuristic: Pattern-based keyword + proximity extraction (~0.51 F1).

Experimental (opt-in via CTXGRAPH_RELEX=1):

• Relex: gliner-relex ONNX model (joint NER + relation extraction).

Variants

ModelBased(ModelBasedRelEngine)

Has both multitask model and optionally relex model.

Heuristic

Implementations

impl RelEngine

pub fn new( model_path: Option<&Path>, tokenizer_path: Option<&Path>, ) -> Result<Self, RelError>

Create a model-based engine if the multitask model is available, otherwise fall back to heuristic mode.

pub fn extract( &self, text: &str, entities: &[ExtractedEntity], schema: &ExtractionSchema, ) -> Result<Vec<ExtractedRelation>, RelError>

Extract relations between entities — fully local, no API calls.

Uses heuristic keyword + proximity extraction (~0.51 F1).

Environment variables:

• CTXGRAPH_RELEX=1: Enable experimental relex ONNX tier