Data correlation matrix is singular about causal-learn

[WilliamsToTo]

I also have the same issue when I use causallearn.search.ScoreBased.GES. I guess it is caused by input data. I don't know what kind of requirements should be met. It would be good if developers could list requirements for input data.

[asha24choudhary]

do u think if it was a good idea to calculate pseudo inverse, if the inverse of the sub_corr_matrix gives error?

[kunwuz]

Yea, this is due to some violation of the data-generating process, e.g., violation of faithfulness. I don't know if any strategy exists to detect this given an observed dataset. The pseudo-inverse could be a good solution in practice, but we need to investigate deeper to see if that would introduce any issue with the asymptotic guarantee.

[kunwuz]

Perhaps adding some small random noises could help?

[priamai]

Yes and can you check two things:
a) distinct count per column
b) distinct count of identical rows

What I learned with repeated data, it does create singular matrix.
Also interested to learn!