[generic_imitation] Setting parameters in source-target manner for paired traits / dimensional traits

[leander-j]

For the example pair of a nominal and a dimensional variable it was not possible for me to set a specific threshold for all pairs where the nominal part takes a specific value, e.g.'a'. I tried

    imi_rel_threshold = {
        'pair': {
            (('a','*'), '*'): 0,}}

but apparently the '*' operator does not work inside a pair.

Building another pair out of a nominal and an ordinal variable I found that the correct syntax for setting pair parameters is

    imi_rel_threshold = {
        'pair': {
            (('a',1), '*'): 0,
            (('a',2), '*'): 0,
            (('a',3), '*'): 0,
            (('a',4), '*'): 0,
            (('a',5), '*'): 0,}}

This is not only a bit impractical in this case but especially means that for the nominal-dimensional pair there is actually no way to set a parameter like this.

On another point this also means that for for dimensional/rational variables there is at the moment no way to set specific values.

Functionality to set thresholds, probabilities etc. depending on parameter ranges would be a possibly useful feature in that case, e.g. using intervals (('a', [lower, upper]), '*'): 0,.