Supporting Concept Search using a Clinical Healthcare Knowledge Graph

We describe our Dictionary based Named Entity Recognizer and Semantic Matcher that enables us to leverage our Knowledge Graph to provide Concept Search. We also describe our Named Entity Linking based Concept Recommender to support manual curation of our Knowledge Graph.

Youtube URL for talk: https://youtu.be/5UWrS_j8dDg

1. Healthcare and Life Sciences Symposium, May 2024 Sujit Pal | Elsevier Health ORC ID : https:// orcid.org /0000-0002-6225-110X Supporting Concept Search using a Clinical Healthcare Knowledge Graph with Named Entity Recognition and Linking

2. H-graph 500k manually curated concepts 14 semantic categories (groups) 3.5 synonyms / concept 150k relationships

3. H-graph 1100+ books 650+ journals 800+ first consult 2900+ drug monographs … Medical Content

4. H-graph Medical Content Search Index Search platform query results terms concepts Bag of concepts Support for synonymy Multi-language Leverage relations

5. H-graph Medical Content Search Index Search platform query results Based on Aho-Corasick algorithm Streaming match Lemmatize + lowercase for recall (except abbrs.) Other NLP services Dictionary based NER concepts

6. H-graph Medical Content Search Index Search platform query results Dictionary based NER concepts Concept Resolver Based on Dictionary based NER Permute tokens for best match Exposes concept relationships concepts / relations

7. H-graph Medical Content Search Index Search platform query results Dictionary based NER concepts Concept Resolver concepts / relations Semantic Matching Text content converted to stream of concepts Embeddings learned using word2vec skip-gram prediction on concepts (training)

8. H-graph Medical Content Search Index Search platform query results Dictionary based NER concepts Concept Resolver concepts / relations Semantic Matcher Search platform has access to: synonym matches, nearest neighbors (KG) and nearest neighbors in concept space (training)

9. H-graph Medical Content Search Index Search platform query results Dictionary based NER concepts Concept Resolver concepts / relations Semantic Matcher (training) Concept Recommender (train) (infer) Trained on KG synonym pairs SapBERT architecture Recommends nearest concept for new phrases in text

10. [email protected] https:// www.linkedin.com /in/ sujitpal /