Publication
Layerwise Relevance Visualization in Convolutional Text Graph Classifiers
Robert Schwarzenberg; Marc Hübner; David Harbecke; Christoph Alt; Leonhard Hennig
In: 13th Workshop on Graph-Based Natural Language Processing. Workshop on Graph-Based Natural Language Processing (TextGraphs-2019), located at EMNLP 2019, November 4, Hong Kong, Hong Kong, ACL, 2019.
Abstract
Representations in the hidden layers of Deep Neural Networks (DNN) are often hard to interpret since it is difficult to project them into an interpretable domain. Graph Convolutional Networks (GCN) allow this projection, but existing explainability methods do not exploit this fact, i.e. do not focus their explanations on intermediate states. In this work, we present a novel method that traces and visualizes features that contribute to a classification decision in the visible and hidden layers of a GCN. Our method exposes hidden cross-layer dynamics in the input graph structure. We experimentally demonstrate that it yields meaningful layerwise explanations for a GCN sentence classifier.