Explaining neural network predictions of material strength
This work addresses the challenge of explainability in AI for materials science, which is incremental as it builds on existing saliency map techniques.
The authors tackled the problem of interpreting neural network predictions of material strength from SEM images by developing a method to map abstract image features to interpretable textures, making the model's decision process more transparent.
We recently developed a deep learning method that can determine the critical peak stress of a material by looking at scanning electron microscope (SEM) images of the material's crystals. However, it has been somewhat unclear what kind of image features the network is keying off of when it makes its prediction. It is common in computer vision to employ an explainable AI saliency map to tell one what parts of an image are important to the network's decision. One can usually deduce the important features by looking at these salient locations. However, SEM images of crystals are more abstract to the human observer than natural image photographs. As a result, it is not easy to tell what features are important at the locations which are most salient. To solve this, we developed a method that helps us map features from important locations in SEM images to non-abstract textures that are easier to interpret.