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Knowledge-Enabled Entity Extraction

Al-Olimat, Hussein S.
http://rave.ohiolink.edu/etdc/view?acc_num=wright1578100367105233

Abstract Details

2019, Doctor of Philosophy (PhD), Wright State University, Computer Science and Engineering PhD.
Information Extraction (IE) techniques are developed to extract entities, relationships, and other detailed information from unstructured text. The majority of the methods in the literature focus on designing supervised machine learning techniques, which are not very practical due to the high cost of obtaining annotations and the difficulty in creating high quality (in terms of reliability and coverage) gold standard. Therefore, semi-supervised and distantly-supervised techniques are getting more traction lately to overcome some of the challenges, such as bootstrapping the learning quickly. This dissertation focuses on information extraction, and in particular entities, i.e., Named Entity Recognition (NER), from multiple domains, including social media and other grammatical texts such as news and medical documents. This work explores the ways for lowering the cost of building NER pipelines with the help of available knowledge without compromising the quality of extraction and simultaneously taking into consideration feasibility and other concerns such as user-experience. I present a type of distantly supervised (dictionary-based), supervised (with reduced cost using entity set expansion and active learning), and minimally-supervised NER approaches. In addition, I discuss the various aspects of the knowledge-enabled NER approaches and how and why they are a better fit for today's real-world NER pipelines in dealing with and partially overcoming the above-mentioned difficulties. I present two dictionary-based NER approaches. The first technique extracts location mentions from text streams, which proved very effective for stream processing with competitive performance in comparison with ten other techniques. The second is a generic NER approach that scales to multiple domains and is minimally supervised with a human-in-the-loop for online feedback. The two techniques augment and filter the dictionaries to compensate for their incompleteness (due to lexical variation between dictionary records and mentions in the text) and for eliminating the noise and spurious content in them. The third technique I present is a supervised approach but with a reduced cost in terms of the number of labeled samples and the complexity of annotating. The cost reduction was achieved with the help of a human-in-the-loop and smart instance samplers implemented using entity set expansion and active learning. The use of knowledge, the monitoring of NER models' accuracy, and the full exploitation of inputs from the human-in-the-loop was the key to overcoming the practical and technical challenges. I make the data and code for the approaches presented in this dissertation publicly available.
Krishnaprasad Thirunarayan, Ph.D. (Advisor)
Keke Chen, Ph.D. (Committee Member)
Guozhu Dong, Ph.D. (Committee Member)
Steven Gustafson, Ph.D. (Committee Member)
Srinivasan Parthasarathy, Ph.D. (Committee Member)
Valerie L. Shalin, Ph.D. (Committee Member)
144 p.
Artificial Intelligence; Computer Science
Named Entity Recognition; Information Extraction; Active Learning; Knowledge-enabled Learning; Minimal Supervision; Entity Set Expansion; Statistical Language Models; Dictionary-based Extraction; Sequence Labeling; Candidate Entity Extraction

Recommended Citations

Citations

  • Al-Olimat, H. S. (2019). Knowledge-Enabled Entity Extraction [Doctoral dissertation, Wright State University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=wright1578100367105233

    APA Style (7th edition)

  • Al-Olimat, Hussein. Knowledge-Enabled Entity Extraction. 2019. Wright State University, Doctoral dissertation. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=wright1578100367105233.

    MLA Style (8th edition)

  • Al-Olimat, Hussein. "Knowledge-Enabled Entity Extraction." Doctoral dissertation, Wright State University, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=wright1578100367105233

    Chicago Manual of Style (17th edition)

wright1578100367105233
1,340
© 2019, some rights reserved.Creative Commons License Knowledge-Enabled Entity Extraction by Hussein S. Al-Olimat is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 3.0 Unported License. Based on a work at etd.ohiolink.edu.
This open access ETD is published by Wright State University and OhioLINK.