For creating SkipSpecies representations of the chemical species, there is a choice of dimensions for the resulting distributed representations. The effect of the choice in the dimensionality is depicted in Figure . It can be observed that, generally, as the number of dimensions increases, the performance of the models also increases. This trend is more dramatic for the max-pooled CBFVs. For both the sum-pooled and mean-pooled CBFVs, there are marginal increases in performance beyond 200 dimensions.