None object return

[kontogiorgos]

Just today, I noticed that the explanation dict for counterfactuals sometimes returns None. It does include the query object, but the counterfactual object is None. Any idea why may that happen? Thank you.

[yangwenz]

The lib wasn't changed recently. Is it because the input params were different?

[kontogiorgos]

Thanks for the quick response. I am not sure where the problem comes from I have the two example inputs of same size (17). It works on the first one but not the second one.

[1]
0.17068946 0 0.733116195 0 0 0.109212438 0.845610604 0 0 0.766995499 1.049617662 0.240121093 0.007876287 0 0 0 1.678424503

[2]
0.428164316 0.322897315 0.847202692 0 0 0 0.865536872 0.005060287 0 0.065755479 2.294708587 0.244758731 0.605453063 0 0 0 1.496855159

[yangwenz]

One possible reason is that for the second one, the algorithm cannot find proper couterfactual examples by the default parameters. You may change the setups for the counterfactual algorithms, e.g., https://github.com/salesforce/OmniXAI/blob/main/omnixai/explainers/tabular/counterfactual/mace/retrieval.py