#kg2023 — Public Fediverse posts

Exploratory Search and Recommendation Systems are the topics of the very last section of our #kg2023 lecture. Learn how to create a simple similarity-based recommender system for books based on SPARQL and #dbpedia. .. but we have 2 more hands-on to come ;-)
OpenHPI video: https://open.hpi.de/courses/knowledgegraphs2023/items/34xP0k99EEweSJmbUqi5lQ
youtube video: https://www.youtube.com/watch?v=CbBtM05IBWE&list=PLNXdQl4kBgzubTOfY5cbtxZCgg9UTe-uF&index=66
slides: https://zenodo.org/records/10185305
#knowledgegraphs #exploratorysearch #scifi #sparql #recommendersystems @tabea @sashabruns @MahsaVafaie @fiz_karlsruhe @fizise

Semantic Search enables retrieval and discovery beyond trditional information retrieval. Learn how #KnowledgeGraphs and semantic technologies can boost the performance of search and retrieval in this section of our #kg2023 lecture.
OpenHPI video: https://open.hpi.de/courses/knowledgegraphs2023/items/6aBMSsEJEZ3YtMOjSYJytn
youtube video: https://www.youtube.com/watch?v=UaCZQ-CsskI&list=PLNXdQl4kBgzubTOfY5cbtxZCgg9UTe-uF&index=65
slides: https://zenodo.org/records/10185298
#semanticsearch #semanticweb #search #retriefal #lecture @fiz_karlsruhe @fizise @tabea

Calling Knowledge Graphs and Symbolic AI to the rescue! How #knowledgegraphs can help to improve the performance of large language models and lower the risks of hallucination, we will explain in this section of our free #kg2023 lecture.
OpenHPI video: https://open.hpi.de/courses/knowledgegraphs2023/items/1zeQqWUsn1G7YpSvqAAwMI
youtube video: https://www.youtube.com/watch?v=5XhaLlQPsrg&list=PLNXdQl4kBgzubTOfY5cbtxZCgg9UTe-uF&index=63
Slides: https://zenodo.org/records/10185291 #ccby40
@fiz_karlsruhe @fizise #llm #llms #ai #hybridAI #semanticweb #deeplearning

Knowledge Graph Embeddings (KGEs) are a very useful tool for few- and zero-shot learning. Of course Link Prediction and #KnowledgeGraph Completion are the most prominent tasks for KGEs. My colleague Ann Tan and I will start our investigation of KGEs in this section of our free #kg2023 lecture.
OpenHPI video: https://open.hpi.de/courses/knowledgegraphs2023/items/3xfeKrryLMeY45OXSwBd86
youtube video: https://www.youtube.com/watch?v=UGmtYSCXsQk&list=PLNXdQl4kBgzubTOfY5cbtxZCgg9UTe-uF&index=62
slides: https://zenodo.org/records/10185280
@tabea @sashabruns @MahsaVafaie @fiz_karlsruhe @fizise #embeddings #linkprediction

"You shall know a word by the company it keeps." Distributional Semantics as the basis for self supervised learning as in today's large language models. This is what my colleague @MahsaVafaie and I are going to talk about in this #kg2023 lecture excursion.
OpenHPI video: https://open.hpi.de/courses/knowledgegraphs2023/items/4fwf0437tRYK49o8Xd18Eg
youtube video: https://www.youtube.com/watch?v=EYAY8nmhpdg&list=PLNXdQl4kBgzubTOfY5cbtxZCgg9UTe-uF&index=61
slides: https://zenodo.org/records/10185262
@fiz_karlsruhe @fizise @tabea @sashabruns @enorouzi #semantics #distributionalsemantics #llm #llms #cooccurrence #wittgenstein

Have you ever particularly thought about the graph in knowledge graphs? What can we learn from the graph structure of a knowledge graph? To answer these questions, Ann Tan and I will dive a little bit deeper into graph theory in this section of our #kg2023 lecture.
#openhpi video: https://open.hpi.de/courses/knowledgegraphs2023/items/4tvRVAcst4kQE0N4g0L2TK
youtube video: https://www.youtube.com/watch?v=n2Q8of_Q26E&list=PLNXdQl4kBgzubTOfY5cbtxZCgg9UTe-uF&index=60
slides: https://zenodo.org/records/10185251
#knowledgegraphs #graphtheory #graphs #semanticweb #linkeddata #lod @fiz_karlsruhe @fizise @tabea @sashabruns

What if OWL is not enough? In this hands-on tutorial of our #kg2023 lecture @sashabruns is showing you how to create and exploit SWRL rules with protégé.
#OpenHPI video: https://open.hpi.de/courses/knowledgegraphs2023/items/2kdpe9211wKu8H2Vc5D8va
youtube video: https://www.youtube.com/watch?v=I81pLmK_lHg&list=PLNXdQl4kBgzubTOfY5cbtxZCgg9UTe-uF&index=57
Slides: https://zenodo.org/records/10136317
@fiz_karlsruhe @fizise @tabea @KIT_Karlsruhe #knowledgegraphs #owl #swrl #ontologies #semanticweb

How to create a #knowledgegraph from existing tabular data, as e.g. from a csv file? In this hands-on session of our #kg2023 lecture @tabea will introduce you to OpenRefine and how to use it for knowledge graph creation.
#OpenHPI video: https://open.hpi.de/courses/knowledgegraphs2023/items/40isSC3cCz4Tly6OGQEQU5
youtube video: https://www.youtube.com/watch?v=_6NMykfLVQU&list=PLNXdQl4kBgzubTOfY5cbtxZCgg9UTe-uF&index=56
OpenRefine: https://openrefine.org/
@fiz_karlsruhe @fizise @sashabruns @enorouzi @sourisnumerique #semanticweb #knowledgegraphs

How to (automatically) create a knowledge graph from text without using an #llm? In this section of our free #kg2023 lecture our colleague Ann Tan will walk you through a python colab notebook in which you will learn how to extract entity pairs and relations needed to construct a knowledge graph.
#OpenHPI video: https://open.hpi.de/courses/knowledgegraphs2023/items/51GlCcDoTOxIrT1DNDe8KV
youtube video: https://www.youtube.com/watch?v=QU5WOw-DwT0&list=PLNXdQl4kBgzubTOfY5cbtxZCgg9UTe-uF&index=55
Colab Notebook: https://colab.research.google.com/drive/1xzbByDBcdwgKkr31YBgrdvKYPqPK-tQw?usp=sharing

#knowledgegraphs #semanticweb #nlp #python #notebook @fiz_karlsruhe @fizise

What happens, when ontologies hit reality? We tried to compile some best practices for working with ontologies and kn owledge graphs in this section of our free #kg2023 lecture.
#OpenHPI video: https://open.hpi.de/courses/knowledgegraphs2023/items/4g2bLHuPYvqSZcPsJ4CLyS
youtube video: https://www.youtube.com/watch?v=vR0ZU6gOo5Y&list=PLNXdQl4kBgzubTOfY5cbtxZCgg9UTe-uF&index=54
slides: https://zenodo.org/records/10135572
#knowledgegraphs #ontologies #bestpractices #lecture #semanticweb #borges @fiz_karlsruhe @fizise @tabea @sashabruns @enorouzi @nfdi4culture

How to construct Knowledge Graphs from text sources or from relational databases? This we are going to discuss in the next section of the #kg2023 lecture.
#OpenHPI video: https://open.hpi.de/courses/knowledgegraphs2023/items/3e0XlQYaXMZQ3TALb091jz
youtube video: https://www.youtube.com/watch?v=i0_7HCG7k80&list=PLNXdQl4kBgzubTOfY5cbtxZCgg9UTe-uF&index=54
slides: https://zenodo.org/records/10135519
#knowledgegraphs #semanticweb #rml #nlp #knowledgeextraction #knowledgemnining #lecture @fiz_karlsruhe @fizise @tabea @sashabruns @enorouzi

How to deal with different ontologies on the same subject? What can we do to get them aligned? Is it possible to learn an ontology from text? These questions, we are going to address in this section of our #kg2023 lecture with the title "Ontological Engineering"
#OpenHPI lecture: https://open.hpi.de/courses/knowledgegraphs2023/items/VseJ7SbPrJS5t8qgHuv57
youtube lecture: https://www.youtube.com/watch?v=w0JmROLn_OA&list=PLNXdQl4kBgzubTOfY5cbtxZCgg9UTe-uF&index=52
slides: https://zenodo.org/records/10135498
@fiz_karlsruhe @fizise @tabea @sashabruns @MahsaVafaie #knowledgegraphs #ontologies #ontologicalengineering #semanticweb

Everybody can design an ontology. But, how to design better ontologies? This is one of the central questions of the next section of our free #kg2023 lecture.
#OpenHPI video: https://open.hpi.de/courses/knowledgegraphs2023/items/1kpaqjHwxUI4HZxm1Wb9ft
youtube video: https://www.youtube.com/watch?v=RHjoCpNj3KQ
slides: https://zenodo.org/records/10135481
@tabea @sashabruns @fiz_karlsruhe @fizise #knowledgegraphs #semanticweb #ontologies #ontology #ontologydesign

Let's design your first ontology! In this section of our free #kg2023 lecture, you will learn about the most simple ontology design methodology called "Ontology 101"
#OpenHPI video: https://open.hpi.de/courses/knowledgegraphs2023/items/5TBHrJQJywkBlcFcA9ZZvZ
Youtube video: https://www.youtube.com/watch?v=twEPP-M8iqc&list=PLNXdQl4kBgzubTOfY5cbtxZCgg9UTe-uF&index=50
slides: https://zenodo.org/records/10135465
@fizise @fiz_karlsruhe @tabea @sashabruns @MahsaVafaie #knowledgegraphs #ontologies #ontologydesign #knmowledgerepresentation #semanticweb #aiart #generativeai

In the next section of our #kg2023 lecture you will learn about the Semantic Web Rule Language SWRL, adding the potential of logical rules to the description logics based #SemanticWeb technology stack.
#OpenHPI video: https://open.hpi.de/courses/knowledgegraphs2023/items/65bnt9mLKrCsVTPF9MLpsF
youtube video: https://www.youtube.com/watch?v=645EaHJK7lQ&list=PLNXdQl4kBgzubTOfY5cbtxZCgg9UTe-uF&index=49
slides: https://zenodo.org/records/10135451
@fizise @tabea @sashabruns @MahsaVafaie #knowledgegraphs #rules #ai #swrl #lecture

In Week 5 of our free #kg2023 lecture we put Ontological Engineering for smarter Knowledge Graphs in the focus. First thing we have to take a look "Beyond the Limits of OWL" to better understand what we can do and what we cannot do with the Semantic Web technology stack.
#OpenHPI video: https://open.hpi.de/courses/knowledgegraphs2023/items/4t7hBxv1I2qkSgWlFN6sm6
youtube video: https://www.youtube.com/watch?v=8G5lCj4BxVw&list=PLNXdQl4kBgzubTOfY5cbtxZCgg9UTe-uF&index=48
slides: : https://zenodo.org/records/10135440
#semantiweb #knowledgegraph #owl #logics #lecture @fiz_karlsruhe @fizise @tabea @sashabruns @MahsaVafaie #aiart

In the next section of the #kg2023 lecture we are going to "Unlock the Potential of OWL" focusing on OWL property relations, Negation, Property Chaining, Qualified Number Restrictions, and Datatypes
#OpenHPI video: https://open.hpi.de/courses/knowledgegraphs2023/items/6LFi2BDyyUPeKhmTSMOKYI
youtube video: https://www.youtube.com/watch?v=AePPu6aIWno&list=PLNXdQl4kBgzubTOfY5cbtxZCgg9UTe-uF&index=44
slides: https://zenodo.org/records/10082610
@fiz_karlsruhe @fizise @tabea @sashabruns @MahsaVafaie @enorouzi #knowledgegraph #semanticweb #linkeddata #lod #owl #rdf #ai

From simple to complex: Scaling up with OWL - in this section of our free #kg2023 lecture, you will learn how to create more complex knowledge representations with OWL. You will learn about class constructors, property constraints, as well as about quantifiers for strict and loose binding.
#OpenHPI video: https://open.hpi.de/courses/knowledgegraphs2023/items/6PCkQvxhv5KcmJ3qAyrkVT
youtube video: https://www.youtube.com/watch?v=RO9TBl7WkL4&list=PLNXdQl4kBgzubTOfY5cbtxZCgg9UTe-uF&index=44
slides: https://zenodo.org/records/10082592
@fiz_karlsruhe @fizise @tabea @sashabruns @MahsaVafaie #knowledgegraph #semanticweb #aiart

The basics of OWL, the Web Ontology Language, are subject of this section of our #kg2023 free open lecture on #knowledgegraphs. Learn about simple OWL based knowledge representations and reasoning with OWL.
#OpenHPI video: https://open.hpi.de/courses/knowledgegraphs2023/items/FXRubbLZFVd2pnKTbXv6M
youtube video: https://www.youtube.com/watch?v=kcRggv2e7-o&list=PLNXdQl4kBgzubTOfY5cbtxZCgg9UTe-uF&index=42
Slides: https://zenodo.org/records/10082562
@fiz_karlsruhe @fizise @MahsaVafaie @tabea @sashabruns #semanticweb #lecture

The next (small) excursion in our #kg2023 free open lecture on #knowledgegraphs is dealing with description logics as the basis of knowledge representation with OWL. From simple ALC to (more complex) SHROIQ(D)
#OpenHPI video: https://open.hpi.de/courses/knowledgegraphs2023/items/1tynpLXMB0al3MiZLxGky0
youtube video: https://www.youtube.com/watch?v=diP64Y-0bOw
slides: https://zenodo.org/records/10082560
#semanticweb #logic #lecture @fiz_karlsruhe @fizise @tabea @sashabruns @MahsaVafaie @enorouzi

You want to become fluent with #SemanticWeb technologies OWL and Description Logics, but you are lacking the fundamental knowledge about logic? No probem, we have compiled a little excursion on "Essential Logics in a Nutshell" as a prerequisite for description logics and OWL in this section of our #kg2023 free lecture
#OpenHPI video: https://open.hpi.de/courses/knowledgegraphs2023/items/6N6hH6XZU16uud9q70ao3z
youtube video: https://www.youtube.com/watch?v=sj1Wg6VwqJI&list=PLNXdQl4kBgzubTOfY5cbtxZCgg9UTe-uF&index=40
#knowledgegraphs #llms #logic #mathematics #descriptionlogics @fiz_karlsruhe @fizise @MahsaVafaie

Before we dive deeper into ontologies and OWL, we are discussing why RDF(S) alone is not enough for (more) expressive knowledge representation. Furthermore, you might ask yourself, why there is a small cow standing on the surface of Mars...but to answer this, you should better watch this #kg2023 lecture ;-)
video lecture: https://www.youtube.com/watch?v=uwLIovYmp3I&list=PLNXdQl4kBgzubTOfY5cbtxZCgg9UTe-uF&index=39
@fiz_karlsruhe @fizise @KIT_Karlsruhe @Hasso_Plattner_Institute @tabea @sashabruns @MahsaVafaie #knowledgegraphs #ontologies #owl #rdf

Week 4 of our #kg2023 free #MOOC course on "Knowledge Graphs - Foundations and Applications" focuses on the topic of ontologies and OWL. In the first section, we approach the topic of ontologies with an historical perspective: From Aristotle to AI: Exploring Ontologies in Computer Science
video lecture: https://www.youtube.com/watch?v=M7rT1y4NYrk&list=PLNXdQl4kBgzubTOfY5cbtxZCgg9UTe-uF&index=38
#OpenHPI #knowledgegraphs #semanticweb #ontologies #philosophy #lecture @fiz_karlsruhe @fizise @MahsaVafaie

Last section of week 3 of our #OpenHPI #MOOC course #kg2023 focusses on #KnowledgeGraph Quality Assurance via SHACL constraints
video: https://www.youtube.com/watch?v=LooicwBXqUk&list=PLNXdQl4kBgzubTOfY5cbtxZCgg9UTe-uF&index=32
#shacl #sparql #ontologies #rdf #semanticweb #lecture @fizise @fiz_karlsruhe @KIT_Karlsruhe

Actually, SPARQL is more than just a plain #RDF Query Language. In this section of our #kg2023 free online lecture, you will learn about SPARQL protocol, ASK, DESCRIBE, CONSTRUCT, and more.
video lecture: https://open.hpi.de/courses/knowledgegraphs2023/items/4PCDMyD71QO7WVp92Lwxie
@fiz_karlsruhe @fizise @tabea @sashabruns @MahsaVafaie #sparql #OpenHPI #lecture #mooc

Which "planetary romance" scifi novels are dealing with "Mars"? A fancy question which we will answer via federated SPARQL queries via #DBpedia and #Wikidata in this section of the free #kg2023 lecture
video lecture: https://open.hpi.de/courses/knowledgegraphs2023/items/Vz149hHvQqOCqz3rlI6xH

#Mars #scifi #sparql #knowledgegraphs #semanticweb #aiart #MOOC #OpenHPI @fiz_karlsruhe @fizise @tabea @sashabruns @enorouzi