Foundations of Artificial Intelligence (GKI)/ Grundlagen der Künstlichen Intelligenz (GKI)

Lecture on Bachelor level, usually offered in summer.

Link to LSF, Summer 2019

In Foundation of Artificial Intelligence you will learn how computers can display intelligent behaviour.

After a brief philosophical introduction, we will focus on the concept of agents, which work autonomously to achieve certain goals. An example of such an agent is a robotic vacuum cleaner. We will discuss the algorithmic details how information is processed and decision are made. This includes finding information in graphs (uninformed search, informed search, local search) as well as ways how an agent deals with uncertainty and unavailable information.

We will furthermore provide an introduction to the field of machine learning, where the computer learns a task from data, without being explicitly programmed by a human how to do it. We will discuss algorithms for classification, clustering and regression, their applications and evaluation.

Contents:

• History of AI
• Definition of Intelligence
• Agents
• Agent Architecture
• Properties of Environments
• Search
• Uninformed Search (BFS, DFS)
• Informed Search (Greedy, A*)
• Local Search (Genetic Algorithms)
• Uncertainty / Probabilistic Models
• Machine Learning
• Classification (Naive Bayes, Decision Trees)
• Clustering
• Regression
• Evaluation
• Applications of AI

Knowledge Based Systems (KBS)/Wissensbasierte Systeme

Lecture on Master level, usually offered in summer.

Link to LSF, Summer 2019

In this lecture, we will discuss methods how to transform information into a representation suited for computers and how to turn this information into knowledge.

We will start with the foundational question of what knowledge is and advance towards various ways of encoding it. We discuss how the degree of similarity between pieces of information can be determined to answer questions such as “is the color black similar to white?” by using a variety of human-curated resources.

In the subfield of machine learning we explore how the computer learns to classify objects in the real world either from human-prepared data or on its own. We will discuss several machine learning algorithms which are commonly used today and highlight properties that one should consider when choosing between algorithms.

Natural Language Human-Computer Interaction (NL HCI)/Natürlichsprachliche Mensch-Computer Interaktion

Lecture on Master level, usually offered in winter.

This lecture is not offered in winter 2019/2020.

In this lecture, we will work on a real world application of natural language based human-computer interaction. The best known application in this field are probably personal assistants on the smart phone like Siri, Cortana, or Ok Google.

We will have a look on the scientific foundations of such personal assistants including:

• Language identification – How do I know whether a request is made in German, English or French?
• Question classification – How does the computer know what is being asked?
• Entity disambiguation – What entities are mentioned in the question?
• To enrich theory with practical experience we will build our own personal assistant system which we are going to steadily improve over the semester.

Language technology/Sprachtechnologie

Lecture on Bachelor level, usually offered in winter.

Link to LSF, Winter 2019/20

In this lecture, we provide an overview of the field of language technology. We start with examples from daily life familiar to most of you.

We will guide you through the various stages of how language -written or spoken- has to be processed in order to let computers work with it. This starts with basic tasks such as detection of word or sentence boundaries, recognizing a word’s part of speech (e.g. noun, verb, etc.) or identifying the language of a text.
More advanced topics are spelling and grammar correction, extraction of keywords and word sense disambiguation.

You will learn about the challenges behind seemingly trivial problems as well as algorithmic ways how to tackle them.

In this practical class you will work on a task from the domain of natural language processing (NLP). We will first learn how to use a professional NLP framework (DKPro). This includes processing data using both existing as well as your own components in your project.

The center of this practical class is to learn how to tackle a real-world NLP problem in DKPro. This includes both an analysis of the necessary steps as well as the implementation of your ideas in actual code within the framework.
Each participating student has to provide an own solution / code for their respective chosen task at the end of the semester. Students are encouraged to exchange information and read through code-examples etc., but bulk copy-paste from websites (other people’s solution) is not accepted. We check for plagiarism!
Students that participate should have a profound knowledge of Java.

After the introduction to DKPro you will choose a project. This project can either be one out of a list we provide or, if you have suitable ideas, a self-selected topic. Popular topics are, for instance, textual similarity or sentiment analysis.

Offered on demand

Here are two examples that show how a project might look like:

1.) Exploring opinionated twitter conversations in the context of popular german TV-shows:

In this project 3 Masterstudents designed and implemented data collection, automatic topic- and sentiment- analysis and interactive visualisation.

2.) Geolocated Hatespeech detection:

In this project two Masterstudents designed and implemented a system to automatically detect and visualise geolocated tweets which contain

Get in contact!
It is advantageous if you already have some NLP-related interests or project ideas. Otherwise we can help you to define a topic.

Seminar: Text-Analytics (usually offered in summer)
Link to LSF Summer 2019

This seminar introduces students to scientific writing of research papers that conforms to the standards of international conference papers.

The students will select a topic from a collection of prepared subject areas that are related to Natural Language Processing (NLP). During the seminar, students will go through the entire publication-creation life-cycle which composes of literature research, formulation of a research hypothesis, implementation / line of argument to (dis-)prove the hypothesis, writing of the actual paper and eventually presentation of the results.

We will provide guidance for these individual steps and how to structure and present information that it conforms to scientific standards.
The task of the student will be on the one hand to do the literature research and analysis to select relevant work and hypothesis generation grounded on this literature. On the other hand, the student will have to organize their texts in a way that people not directly involved in the creation process of the paper can understand and follow the line of thoughts. To get a better feeling for the challenging nature of writing scientific results down in an understandable fashion, students will peer-review their work (students exchange their current working version with their fellow students and mutually criticize their work for clarity, correctness/soundness and meaningful comparison(s)).

At the end of this seminar, the students present their results and hand in their paper that is graded for the same criterions that apply in peer-reviewing.
Each participant has to hand in an own paper, group work is not permitted.

Master and Bachelor Theses

We offer options to write Bachelor and Master theses for students from Computer Science and Komedia. Topics can be selected based on your preferences, but need to be in the area of natural language processing and should ideally relate to one of our main research topics.

Prerequisites
The practical work for your thesis will most likely include some amount of programming. At the lab, we use DKPro, a framework written in Java, for most NLP tasks and you should be willing to familiarize yourself with it.

Finding a Topic
We can help you define a topic, but it usually helps if you already have some rough ideas what you would like to work on. Please contact us early to allow some time for that process and provide us some background about yourself such as:

• Have you already attended lectures or seminars from our group? Which ones?
• What is you programming experience? (which languages and how long?)
• What NLP topic(s) do you find interesting, what would you potentially like to work on?

If you already have a clear idea what you would like to work on fill out our thesis questionaire [Link]

Thesis Template
You are encouraged to write the report for your thesis in LaTeX. We strongly recommend that you use the following template:

• template.zip
• Overleaf Template

Past Thesis Topics
The following list of finished Master's and Bachelor's theses should give you an idea of the range of topics offered:

2019

• Strike-through Text Identification from Handwritten Documents
  Hiroshi Hamano

• Comparing the speech recognition quality of Amazon Alexa and Google Home
  Dominik Thiel

• Adversarial Examples for Evaluating Automatic Content Scoring Systems
  Yuning Ding

• Sentiment Analysis using Textual and Auditory Cues
  Jan Henry van der Vegte

• Analysis and Comparison of Web-scraping Tools
  Olga Filipova

• Evaluation des Einflusses von fehlenden Word Embeddings auf Semantische Textähnlichkeit
  René Lehmann

• Analyzing the transfer of aspect-based sentiment extraction to hotel reviews
  Jonas Philipp Meise

2018

• The influence of segmentation quality on Chinese stance detection
  Yangxu Li

• Cross-lingual content scoring
  Sebastian Stennmanns

• Automatic detection of irony and sarcasm in German online news articles
  Nivelin Stoyanev & Radomir Georgiev

• Study on Register in Editorial Work Using Data-Mining Methods
  Paavo Pohndorff

• Comparative evaluation of embeddings based on semantic similarity and relatedness
  Jonas Müller

• Mapping human reactions to events in voice-controlled smart home environments
  Jeanette Alice Schenkewitz

• Non-common sense baselines for a common sense reading comprehension task
  Christian Haring

• An Ontology-based Approach for Stance Detection in Tweets on Catalan Independence
  Thiago Encarnacao

• Comparing transfer learning approaches on the task of review rating prediction
  Eduardo Goulart Rocha

• Vergleich von Verfahren zur Annotation von Wortverwandtschaft
  Mara Ortmann

• Topic-sensitive methods for automatic spelling correction
  Ruishen Liu

• Cross-task scoring of complex writing tasks using domain adaptation and task-independent features
  Marie Bexte

• A Comparative Evaluation of German Grapheme-to-Phoneme Conversion Libraries
  Rüdiger Fröhlich

• The influence of ngram configurations on classification results
  Valentin Panagiev

2017

• Automatische Spracherkennung von transkribierten Tweets am Beispiel von Arabizi
  Anas Zine al Dine

• Transferring Automated Essay Grading Models between Domains and Languages
  Onur Sünme

• Comparing the Performance of Sentiment Analysis Services
  Salah Beck

• Detecting Sarcasm in Tweets
  Alexander Büchtle

• The influence of spelling errors on the performance of short-answer scoring systems
  Yuning Ding

• Quantifying the polarity of names based on sentiment lexicons and word embeddings
  Wen Bin Le

• The impact of language errors and the performance of native language identification
  Yufei Mu

• Comparing the applicability of relation inference datasets for evaluating distributional methods
  Marius Hamacher

2016

• Generating and Evaluating Part-of-Speech Tagger Models for Multiple Languages
  Dominik Lawatsch

• Language Models for L2 Writing Assistance
  Robin Schmidt

• The Impact of Negation on the Quality of Sentiment Analysis
  Paavo Pohndorff

• The Influence of Gap Ambiguity and Language Proficiency on the Performance of Bundled Gap Exercises
  Niklas Meyer

• Erkennung von im lateinischen Alphabet geschriebenen Dari Tweets
  Habiel Abromand

• Improving Anaphora Resolution Through Corpus Mined Gender Information
  Jan-Henry van der Vegte

2015

• Identifying Semantically Equivalent Twitter Messages,
  Marc Morgenbrod

• Erkennung der Sprache in kurzen "social Media" Texten,
  Rangeeth Paramananthan

• Entwicklung eines Frameworks zur Extraktion von Netzwerken aus Texten,
  Tobias Graeve

• Automatische Korrektur von Präpositionen und Artikeln,
  Behnaz Spieker

• Vergleich von Textähnlichkeitsmaßen anhand von Geschwindigkeit und Leistungsverhalten,
  Danijela Schlue

• Konfiguration und Verifikation von UIMA Pipelines,
  Patrick Wafo

• Vergleich von Topic und N-Gramm Modellen in Wortvorschlagssystemen,
  Lydia Penkert

• Predicting Cloze-Test Difficulty with Semantically Sensitive Language Models,
  Michael Wojatzki

• Automatische Bestimmung des Erstellungszeitpunktes von Textdokumenten,
  Tamara Feldkamp

• Comparing spell-checking tools with respect to the quality of automatic corrections,
  Sebastian Stenmanns

• Entwicklung eines deutschen Social Media Models für HeidelTime,
  Christian Aldenhoff

2014

• Identifying the native language of a text’s author,
  Jens Thiel

• The Influence of Smileys as a Feature in Opinion-based Text Classification,
  Martin Sokalla

• Vergleichende Evaluation von UIMA-Textanalysekomponenten,
  Onur Sünme

We are constantly looking for motivated students who are insterested in working with us on NLP-related topics. Most of the jobs require some sort of programming experience, preferrably in Java or Python. To get an idea what we are working on, you can find a list of our ongoing research here. Contact us so that we can find out together if we currently have an interesting task for you!