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SECOND CYCLE, 30 CREDITS
, STOCKHOLMSWEDEN2021Question answering on
introductory Java programming concepts using the TransformerLUKAS SZERSZEN
KTH ROYAL INSTITUTE OF TECHNOLOGY
SCHOOL OF ELECTRICAL ENGINEERING AND COMPUTER SCIENCEQuestion answering on
introductory Java programming concepts using the TransformerLUKAS SZERSZEN
Date: March 14, 2021
Supervisor: Richard James Glassey
School of Electrical Engineering and Computer Science iiiAbstract
AI applications for education could help students learn in their introductory programming courses. Many applications for education try to simulate a hu- man tutoring session that engages the student in a dialogue. During the ses- sion, they can ask questions and have them answered while working through an exercise. Refining the question-answering capability of such applications mayprovetobeabaseforsupplementaryeducationtools. Thesecouldbeused by students in introductory programming courses to ask questions to review concepts in programming, facilitating the teaching done by professors. This thesis investigates question-answering on introductory Java program- ming using The Transformer model. The focus is on the extent to which the model can answer questions on Java concepts when trained on questions and answers from the online programming forum Stack Overflow. A total of five Transformer models with default parameters were trained on posts segmented with different granularities using byte-pair encoding. Each model was evalu- ated using perplexity as an automatic metric and a qualitative evaluation done by the author. The automatic metric evaluation scores a low perplexity indicating a high- quality model. However, the qualitative evaluation shows that the generated responses are short, generic, repetitive, and even contradicting, with the most common response being "You can do it like this:". That is, the model exhibits a fundamental inability to answers questions on Java programming concepts. ivSammanfattning
len. Fokus har lagts på i vilken grad modellen kan besvara frågor angåendeContents
1 Introduction
11.1 Problem Specification
31.2 Research Question
41.3 Limitations
42 Background
62.1 AI In Education
62.1.1 Intelligent Tutoring Systems
72.2 Machine Translation
92.2.1 Sequence to sequence model
92.2.2 Recurrent Encoder-Decoder
102.2.3 Transformer
112.2.4 Sub-word NMT
132.2.5 Word Embeddings
142.2.6 Transfer Learning
152.2.7 Evaluation
162.3 Related Work
182.3.1 Intelligent Tutoring Systems
182.3.2 Java question answering
202.3.3 Conversational Modeling & Dialogue Generation
213 Method
233.1 Dataset
233.1.1 Data collection
253.1.2 Dataset statistics
263.2 OpenNMT
273.3 Preprocessing
293.4 Model
323.5 Training
33v vi CONTENTS
3.5.1 Training setup
333.5.2 Optimizer
343.5.3 Regularization
343.5.4 Pre-trained subword embeddings
343.6 Evaluation
353.6.1 Automatic evaluation - Perplexity
353.6.2 Qualitative evaluation
373.7 Method limitations
373.7.1 Hyperparameter optimization
373.7.2 Data preparation
384 Results
404.1 Metric Evaluation
404.2 Qualitative Analysis
444.2.1 Evaluation on test dataset
444.2.2 Out-of-corpus questions
455 Discussion
495.1 Generated Response Analysis
495.2 Segmentation
515.3 Pre-trained Embeddings
515.4 Metric & qualitative evaluation
525.5 Implications for AI in education
535.6 Limitations and future research
545.7 Sources of Error
555.8 Sustainability, ethics and societal aspects
556 Conclusion
57Bibliography
58A Appendix
65A.1 Abbreviations
65A.2 Code
66Chapter 1
Introduction
Learning programming and Computer Science is a difficult task. Program- ming is not learned by memorization of facts or concepts from course text- books. It requires students to apply their knowledge to solve programming problems. This process develops the programming skills of the student, but moreimportantly,theirabilitytoproblem-solve. Astudent"sabilitytoproblem- solve is crucial to master programming as they continue in their education and are required to solve harder problems [ 1 Teachers responsible for introductory programming relate to the struggles oftheirstudentsinlearningthefundamentalsofprogramming[ 2 ]. Acommon factor is that students lack generic problem-solving skills, which are essential to learning programming [ 2 ]. As students progress through their introduc- tory course, they fail to connect skills and techniques learned from past pro- gramming assignments to new ones. The consequence becomes that students develop incorrect solutions in the long-term [ 2 3 Help and guidance from a teacher are essential to students learning. Intro- ductory programming courses are often comprised of a larger than usual body of students. Teachers and Teaching Assistants (TA) are limited in both quan- tity and the amount of time they can spend on helping students [ 4 ]. This is a problem throughout education. A large number of students make it difficult to provide the necessary individual help during the limited amount of dedicated time. Providing individual help, or individual one-on-one tutoring with a hu- man tutor has long been established as the most effective means of teaching and improving learning outcomes [ 5 6 ]. As it is not realistic to provide each student with an individual tutor, other means of facilitating learning have been sought after. For this reason, technology has had an increasingly integral role 12 CHAPTER 1. INTRODUCTION
in providing solutions that enhance learning. The hope is that technology can supply students and teachers with tools that can mimic, or supplement, indi- vidual tutoring, without the time and accessibility constraints of humans. A variety of computer-assisted learning tools have been developed and in- troduced into teaching. A common example is that of an Intelligent Tutor- ing System (ITS). ITS are applications for education that simulate one-on-one personal tutoring. These systems tutor students through practice problems on which they receive feedback. An integral feature is tracking the student"s de- velopment and knowledge. ITS have shown to be beneficial to learning when combined with traditional teaching methods, and when used on their own [ 7 The recent advancement of Artificial Intelligence (AI) has lead to an emer- genceofresearchlookingtoincorporateAIintoeducation. VariousAI-supported tutoringapproachesandtoolshavebeendevelopedtohelpstudentslearnbasic programming [ 1 ]. While different AI-supported ITS approaches to teaching programmingexist,onesuchapproachisdialogue-basedtutoring. Adialogue- based ITS approach centers around the student engaging with an AI-agent in a dialogue about specific programming concepts and problems [ 1 The dialogue-based approach to AI-facilitated tutoring centers on the stu- dent being able to ask questions to initiate a dialogue, and the system"s ability to respond. The responses provided by the agent progress the conversation through a tutoring session. Different configurations for dialogue-based ap- proaches to basic programming exist, and there is not one generic structure for the tutoring session. Instead, the level of dialogue is adapted to the task and the concept of programming which is being taught [ 1 The broader class of systems which answer questions are referred to as question answering (QA) systems. Such systems are related to the fields of neural machine translation, conversation modeling, and dialogue generation. The neural approach has become increasingly common due to the promising results shown by neural sequence-to-sequence models in predicting the next sentence given the previous sentence [ 4 8 ]. For example, they have shown to be able to find a solution to IT-help-desk technical problems over the course of a few dialogue turns in a conversation [ 8 Current neural sequence-to-sequence models have achieved new state-of- the-art results in question answering, as well as other areas of Natural Lan- guageProcessing(NLP).Ofparticularinterestisthemodel"TheTransformer", which has since its initial release been adapted and modified to further push the limits in various NLP tasks [ 9 10 11 12 ]. It is therefore of interest to investigate the potential use of "The Transformer" when applied to program- ming education. Adapting the Transformer for question answering accordingCHAPTER 1. INTRODUCTION 3
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