Input space stands for the space spawned when the inputs of the network are taken as axes. Then, for given input patterns, points in this space can be identified. Currently only networks with 2 or 3 inputs can be visualized by this software.7
Input space can be visualized either by plotting the input patterns from the data set, or by plotting all possible inputs regardless of the data set. Here, we plot all possible points to get a view of the separation in the input space.