Publication

AFEC: A knowledge graph capturing social intelligence in casual conversations

Pearl Pu Faltings
2026

Abstract

This paper presents AFEC, an automatically curated knowledge graph derived from everyday casual conversations. The graph’s encoded knowledge enhances conversational systems by modeling how people express acknowledgment, consolation, and empathy in social interactions. To construct a comprehensive and meaningful dataset, we curated a large-scale corpus from the r/CasualConversation subreddit. By extracting the first two turns of all conversations, we obtained 134K speaker nodes and 666K listener nodes. To illustrate the utility of AFEC, we developed a retrieval-based chatbot and compared its performance with existing empathetic dialogue models. Experimental results demonstrate that our chatbot generates significantly more diverse responses (achieving at least 15% higher diversity scores in human evaluations) while outperforming two of the four baseline models in terms of response quality. The data and code are publicly available at https://github.com/yuboxie/afec .

Official source

https://infoscience.epfl.ch/entities/publication/34c9839c-77a1-417d-a49c-08bbf03c3a3a

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Pearl Pu Faltings
2026

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/34c9839c-77a1-417d-a49c-08bbf03c3a3a

About this result

Related concepts (32)

Graph theory

In mathematics, graph theory is the study of graphs, which are mathematical structures used to model pairwise relations between objects. A graph in this context is made up of vertices (also called nodes or points) which are connected by edges (also called links or lines). A distinction is made between undirected graphs, where edges link two vertices symmetrically, and directed graphs, where edges link two vertices asymmetrically. Graphs are one of the principal objects of study in discrete mathematics.

Line graph

In the mathematical discipline of graph theory, the line graph of an undirected graph G is another graph L(G) that represents the adjacencies between edges of G. L(G) is constructed in the following way: for each edge in G, make a vertex in L(G); for every two edges in G that have a vertex in common, make an edge between their corresponding vertices in L(G). The name line graph comes from a paper by although both and used the construction before this.

Planar graph

In graph theory, a planar graph is a graph that can be embedded in the plane, i.e., it can be drawn on the plane in such a way that its edges intersect only at their endpoints. In other words, it can be drawn in such a way that no edges cross each other. Such a drawing is called a plane graph or planar embedding of the graph. A plane graph can be defined as a planar graph with a mapping from every node to a point on a plane, and from every edge to a plane curve on that plane, such that the extreme points of each curve are the points mapped from its end nodes, and all curves are disjoint except on their extreme points.

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