This keyword indicate number of input (independent) variables.
The output (dependent) variables are defined by keyword OUTPUTS. The number of OUTPUTS variables can be also 0.
Each variable is represented as a column of data table. The input variables are before of output (target) variables.
Only the input variables are pre-processed by the UFS.
See FAQ if you have questions. How to cite this applet? Are you looking for a new job in chemoinformatics?