Fig 11. Dimensionality Reduction to understand the roles of transistors.

We apply non-negative matrix factorization (NMF) to the space invaders (SI) task. (A) shows the six reduced dimensions as a function of time showing clear stereotyped activity. (B) the learned transistor state vectors for each dimension (C) Map of total activity—color indicates the dimension where the transistor has maximum value, and both saturation and point size indicate the magnitude of that value.