  In this paper, we run two methods of explanation, namely LIME and Grad-CAM,
on a convolutional neural network trained to label images with the LEGO bricks
that are visible in them. We evaluate them on two criteria, the improvement of
the network's core performance and the trust they are able to generate for
users of the system. We find that in general, Grad-CAM seems to outperform LIME
on this specific task: it yields more detailed insight from the point of view
of core performance and 80\% of respondents asked to choose between them when
it comes to the trust they inspire in the model choose Grad-CAM. However, we
also posit that it is more useful to employ these two methods together, as the
insights they yield are complementary.
