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@lysander07@sigmoid.social
2025-08-02 11:55:45

In our last #ISE2025 lecture last week, we were discussing what makes a node "important" in a knowledge graph. A simple heuristics can be borrowed from graph theory or communication theory: Degree Centrality
Interestingly, in Wikidata In-degree centrality states Jane Austen to be to most "important" female author, while Out-degree centrality claims J.K. Rowling as being…

Slide from the ISE2025 lecture, showing indegree centrality measures for female authors derived from Wikipedia pages that are featuring an article about this author. For In-degree centrality, Jane Austen qualifies as the "most important" female author :) .
@lysander07@sigmoid.social
2025-08-06 09:36:34

The #ISE2025 lecture is over. Today our students will write the final exam. FIngers crossed. Meanwhile - as our favorite coffee place is on vacation - Cappuccino and Zupfkuchen (highly recommended) together with the @… TA team at Intro Café :)

@lysander07@sigmoid.social
2025-08-02 11:55:45

In our last #ISE2025 lecture last week, we were discussing what makes a node "important" in a knowledge graph. A simple heuristics can be borrowed from graph theory or communication theory: Degree Centrality
Interestingly, in Wikidata In-degree centrality states Jane Austen to be to most "important" female author, while Out-degree centrality claims J.K. Rowling as being…

@lysander07@sigmoid.social
2025-07-30 15:15:32

One of our final topics in the #ISE2025 lecture were Knowledge Graph Embeddings. How to vectorise KG structures while preserving their inherent semantics?
#AI #KGE

@lysander07@sigmoid.social
2025-08-06 09:36:34

The #ISE2025 lecture is over. Today our students will write the final exam. FIngers crossed. Meanwhile - as our favorite coffee place is on vacation - Cappuccino and Zupfkuchen (highly recommended) together with the @… TA team at Intro Café :)

A dark brown cup of Cappuccino. The Cappuccino shows some Latté-Art in the form of a heart. Next, a piece of Zupfkuchen on a plate with a fork beside. In the upper left corner of the picture, we see the fragment of a Tunesian style ceramic ash tray (very colorful). On the table surface (mace of wood) there is the number 20 (as a helper for the service, when you are ordering your drink/cake inside)
@lysander07@sigmoid.social
2025-07-01 07:35:27

Tomorrow, we will dive deeper into ontologies with OWL, the Web Ontology Language. However, I'm doing OWL-lectures now for almost 20 years - and OWL as well as the lecture haven't changed much. So, I'm afraid I'm going to surprise/dissapoint the students tomorrow, when I will switch off the presentation and start improvising a random OWL ontology with them on the blackboard ;-)
#ise2025

Slide from the OWL slide deck of Information Service ENgineering 2025. An example for a nominal in OWL is depicted, i.e. a class that is defined by enumerating its members. The example is "MaddAddamTrilogyBook", which refers to a trilogy of novels by Margaret Atwood, It is defined to consist out of "Oryx and Crate, The Year of the Flood, and Madd Addam. The book covers of the three books are shown for an illustration.
@lysander07@sigmoid.social
2025-07-30 15:15:32

One of our final topics in the #ISE2025 lecture were Knowledge Graph Embeddings. How to vectorise KG structures while preserving their inherent semantics?
#AI #KGE

4. Basic Machine Learning / 4.9 Knowledge Graph Embeddings The slide visualises the process of knowledge graph embeddings creation. starting out with a kg, scoring function, loss function, and negatives generation are represented, which are responsible for preserving semantics in the process of vectorisation. The created vectors then serve as representations for entities and properties in downstream tasks, as e.g. classification or question answering.