[Eeglablist] ICA running slowly and returning error

[Anaelle Alouit]

Dear all,

I have ran ICA on a few datasets of 64 channels without any problem, but for one dataset, the ICA decomposition takes hours (an entire weekend instead of 1-2 hours), and in the end, I can’t use the ICLabel tool because it is returning an error saying “the ica decomposition must be real”.
I tried cleaning the data with the CleanData/ASR plugin, but it didn’t help. I downsample to 256Hz and high-pass filter at 1Hz. 

Since I have the same type of dataset and exactly the same kind of pre-processing, do you know what may cause this ?

Best regards,

Anaëlle ALOUIT