[Mne_analysis] Error nproj = np.sum((S / S[0]) > 1e-2) raised when applying projectors {Disarmed}

[Scheltienne Mathieu]

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Hello,

I am using NumPy 1.18 on Windows and 1.19.4 on mac OS.

Mathieu

From: <mne_analysis-bounces at nmr.mgh.harvard.edu> on behalf of Eric Larson <larson.eric.d at gmail.com>
Reply to: Discussion and support forum for the users of MNE Software <mne_analysis at nmr.mgh.harvard.edu>
Date: Tuesday, 8 December 2020 at 13:40
To: Discussion and support forum for the users of MNE Software <mne_analysis at nmr.mgh.harvard.edu>
Subject: Re: [Mne_analysis] Error nproj = np.sum((S / S[0]) > 1e-2) raised when applying projectors {Disarmed}


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Are you on NumPy 1.19.4? A Windows update introduced a FPU bug a couple of months ago that they're planning on patching in January I think:

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In the meantime, a workaround is to install NumPy 1.19.3 on Windows. There is also a NumPy 1.20 release coming soon that should fix it.

Eric


On Tue, Dec 8, 2020 at 4:06 AM Scheltienne Mathieu <mathieu.scheltienne at epfl.ch<mailto:mathieu.scheltienne at epfl.ch>> wrote:

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Dear all,

I am using MNE for EEG analysis on my MacBook Pro on both mac OS and Windows (double boot).
Today, I could not apply projectors on Windows but I could on mac OS. The error raised on Windows is:

C:\Program Files\Python\Python38\lib\site-packages\mne\io\proj.py:641: RuntimeWarning: invalid value encountered in greater
    nproj = np.sum((S / S[0]) > 1e-2)

The error was raised when doing:

raw = mne.io.read_raw_fif(fname, preload=True)
raw.set_eeg_reference(ref_channels='average', projection=True) # CAR
eog_projs, _ = mne.preprocessing.compute_proj_eog(raw, n_grad=0, n_mag=0, n_eeg=1, reject=None,
                                                                                                  no_proj=True, n_jobs=1)
raw.add_proj(eog_projs)
raw.plot(scalings=DEFAULT_SCALINGS)

Note that using only one of the 2 projectors raises the same error; and using raw.apply_proj() does it as well.
Same file with same script on mac OS is working fine. Any idea for a solution?

Have a nice day,
Mathieu Scheltienne
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