PSI, frequency bands, and edge artifacts

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Dear MNE Community,

When you run PSI (or other connectivity measures) on very short epochs within a given frequency band (using fmin and fmax rather than filtering beforehand), how does the function limit to those frequencies? Is there still a risk of introducing edge artifacts? Is there a common approach to quantify this risk?

Thank you,
Josh

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hi,

I don't reallly know. I would try a simulation to see how it behaves.

maybe someone else has more experience

Alex

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Hi all,
I am attempting to follow upgrade instructions. I was able to upgrade
conda, and I succeeded in using curl to get the yml file.
However, when I try the conda env update, I eventually get an error when
the update gets to dipy. See below. Any suggestions?

Thanks for your help,
Megan

conda env update --file environment.yml
Using Anaconda Cloud api site https://api.anaconda.org
Fetching package metadata ...........
Solving package specifications: .
...
ERROR: Invalid requirement: 'dipy --only-binary dipy'

conda --version && python --version
conda 4.3.30
Python 3.8.5

Here is the contents of my environment.yml file:

name: mne
channels:
- defaults
dependencies:
- python>=3.8
- pip
- numpy
- scipy
- matplotlib
- numba
- pandas
- xlrd
- scikit-learn
- h5py
- pillow
- statsmodels
- jupyter
- joblib
- psutil
- numexpr
- traits
- pyface
- traitsui
- imageio
- tqdm
- spyder-kernels
- pip:
  - mne
  - imageio-ffmpeg>=0.4.1
  - vtk>=9.0.1
  - pyvista>=0.24
  - pyvistaqt
  - mayavi
  - PySurfer[save_movie]
  - dipy --only-binary dipy
  - nibabel
  - nilearn
  - neo
  - python-picard
  - PyQt5>=5.10,<5.14; platform_system == "Darwin"
  - PyQt5>=5.10; platform_system != "Darwin"

MEG Technician
The Mind Research Network
1101 Yale Blvd. NE
Albuquerque, New Mexico 87106
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HI all,
I'm wondering if this is an error because I already have things installed.
The dipy page says to uninstall dipy before installing using pip.
Are there separate instructions for upgrades? I realized I'm trying to
follow install instructions.

import dipy
dipy.__file__

'/export/research/analysis/human/jstephen/shared/programs/python/anaconda3/lib/python3.5/site-packages/dipy/__init__.py'

I also tried to do the upgrade after removing the dipy line from the .yml
file, but I got errors relating to PyQt
Collecting PyQt5>=5.10
  Using cached PyQt5-5.15.0.tar.gz (3.3 MB)
  Installing build dependencies: started
  Installing build dependencies: finished with status 'done'
  Getting requirements to build wheel: started
  Getting requirements to build wheel: finished with status 'done'
    Preparing wheel metadata: started
    Preparing wheel metadata: finished with status 'error'

I may have more details on the error tomorrow. I lost my connection to the
remote server I'm working on.

Thanks,
Megan
MEG Technician
The Mind Research Network
1101 Yale Blvd. NE
Albuquerque, New Mexico 87106

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hi Megan,

you should ask this question to the dipy developpers. We are just users here.

Alex

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Hi Josh,

I have not checked the function for MNE. but the original function form Guido Nolte uses FFT, and then takes the desired frequency bins. If the segments are very short (i.e. time domain multiplied by a very short rectangular window), then we know that at the frequency domain the frequency representation of the signal is convoluted by a sinc function, which makes the frequency representation not so perfect! A solution to alleviate this problem is to multiply the segments by a window shape like hanning, or others.

I suggest you to first check inside the respective functionin MNE, check how it is done there.

Best,
Mina

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Hi all,
Ok, I've asked the dipy people about that error, but I could still use help
with the update.
Should install instructions work for update, too? Should I just use pip to
update mne instead of trying to use the new environment file?

I took the dipy line out of the environment file. Here is the error I'm
getting from PyQt5....
Any ideas/suggestions?
Thank you,
Megan

Collecting PyQt5>=5.10
  Using cached PyQt5-5.15.0.tar.gz (3.3 MB)
  Installing build dependencies: started
  Installing build dependencies: finished with status 'done'
  Getting requirements to build wheel: started
  Getting requirements to build wheel: finished with status 'done'
    Preparing wheel metadata: started
    Preparing wheel metadata: finished with status 'error'
    ERROR: Command errored out with exit status 1:
     command:
/export/research/analysis/human/jstephen/shared/programs/python/anaconda3/envs/mne20conda4/bin/python
/export/research/analysis/human/jstephen/shared/programs/python/anaconda3/envs/mne20conda4/lib/python3.8/site-packages/pip/_vendor/pep517/_in_process.py
prepare_metadata_for_build_wheel /tmp/tmperieq8r7
         cwd: /tmp/pip-install-ci617d3e/pyqt5
    Complete output (35 lines):
    Querying qmake about your Qt installation...

/export/research/analysis/human/jstephen/shared/programs/python/anaconda3/bin/qmake
-query
    Traceback (most recent call last):
      File
"/export/research/analysis/human/jstephen/shared/programs/python/anaconda3/envs/mne20conda4/lib/python3.8/site-packages/pip/_vendor/pep517/_in_process.py",
line 126, in prepare_metadata_for_build_wheel
        hook = backend.prepare_metadata_for_build_wheel
    AttributeError: module 'sipbuild.api' has no attribute
'prepare_metadata_for_build_wheel'

    During handling of the above exception, another exception occurred:

    Traceback (most recent call last):
      File
"/export/research/analysis/human/jstephen/shared/programs/python/anaconda3/envs/mne20conda4/lib/python3.8/site-packages/pip/_vendor/pep517/_in_process.py",
line 280, in <module>
        main()
      File
"/export/research/analysis/human/jstephen/shared/programs/python/anaconda3/envs/mne20conda4/lib/python3.8/site-packages/pip/_vendor/pep517/_in_process.py",
line 263, in main
        json_out['return_val'] = hook(**hook_input['kwargs'])
      File
"/export/research/analysis/human/jstephen/shared/programs/python/anaconda3/envs/mne20conda4/lib/python3.8/site-packages/pip/_vendor/pep517/_in_process.py",
line 130, in prepare_metadata_for_build_wheel
        return _get_wheel_metadata_from_wheel(backend, metadata_directory,
      File
"/export/research/analysis/human/jstephen/shared/programs/python/anaconda3/envs/mne20conda4/lib/python3.8/site-packages/pip/_vendor/pep517/_in_process.py",
line 159, in _get_wheel_metadata_from_wheel
        whl_basename = backend.build_wheel(metadata_directory,
config_settings)
      File
"/tmp/pip-build-env-uvtea85d/overlay/lib/python3.8/site-packages/sipbuild/api.py",
line 51, in build_wheel
        project = AbstractProject.bootstrap('pep517')
      File
"/tmp/pip-build-env-uvtea85d/overlay/lib/python3.8/site-packages/sipbuild/abstract_project.py",
line 82, in bootstrap
        project.setup(pyproject, tool, tool_description)
      File
"/tmp/pip-build-env-uvtea85d/overlay/lib/python3.8/site-packages/sipbuild/project.py",
line 479, in setup
        self.apply_user_defaults(tool)
      File "project.py", line 62, in apply_user_defaults
        super().apply_user_defaults(tool)
      File
"/tmp/pip-build-env-uvtea85d/overlay/lib/python3.8/site-packages/pyqtbuild/project.py",
line 89, in apply_user_defaults
        super().apply_user_defaults(tool)
      File
"/tmp/pip-build-env-uvtea85d/overlay/lib/python3.8/site-packages/sipbuild/project.py",
line 225, in apply_user_defaults
        self.builder.apply_user_defaults(tool)
      File
"/tmp/pip-build-env-uvtea85d/overlay/lib/python3.8/site-packages/pyqtbuild/builder.py",
line 77, in apply_user_defaults
        self._get_qt_configuration()
      File
"/tmp/pip-build-env-uvtea85d/overlay/lib/python3.8/site-packages/pyqtbuild/builder.py",
line 450, in _get_qt_configuration
        raise UserException(
    sipbuild.exceptions.UserException

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Building PyQt5 from source shouldn't happen. What platform are you on?
Windows/Linux/macOS should in principle all work. Maybe you need to `pip
install --upgrade pip`?

Can you also try:

$ python -c "import setuptools; print(setuptools.__version__)"

Setuptools 50.0 has broken things in SciPy lately, it's possible there are
other bugs. If it's 50.0, try `pip install "setuptools<50.0"`.

Eric

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Hi Eric,
Thanks for the questions. See terminal commands and outputs below. I'm on
Linux.
Since pip is listed in the environment.yml file, it should have been
upgraded by the conda env -update command, right?
In the environment I'm trying to update, mne is broken, so I can't use
the python -c "import mne; mne.sys_info()" command. The results below are
from the environment where I have a working mne 0.15 package, but I'm not
sure which other modules have been updated there.

Thanks again,
Megan

*updated environment:*
pip --version
pip 20.2.2 from
/export/research/analysis/human/jstephen/shared/programs/python/anaconda3/envs/mne20conda4/lib/python3.8/site-packages/pip
(python 3.8)

python -c "import setuptools; print(setuptools.__version__)"
49.6.0.post20200814
*/updated environment*

*old environment:*
conda --version && python --version
conda 4.3.30
Python 3.5.4 :: Anaconda 2.5.0 (64-bit)

python -c "import mne; mne.sys_info()"
Platform: Linux-2.6.32-573.7.1.el6.x86_64-x86_64-with-centos-6.7-Final
Python: 3.5.4 |Anaconda 2.5.0 (64-bit)| (default, Aug 14 2017,
13:26:58) [GCC 4.4.7 20120313 (Red Hat 4.4.7-1)]
Executable:
/export/research/analysis/human/jstephen/shared/programs/python/anaconda3/bin/python
CPU: x86_64: 24 cores
Memory: 126.0 GB

mne: 0.15.2
numpy: 1.10.4 {lapack=SCIPY_MKL_H, blas=SCIPY_MKL_H}
scipy: 0.17.0
matplotlib: 3.0.3

sklearn: 0.17.1
nibabel: 2.3.3
mayavi: Not found
pycuda: Not found
skcuda: Not found
pandas: 0.17.1
*/old environment*

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If faced with this, I'd recommend creating a *new* conda environment rather than trying to update an old one. If it works cleanly, it's possible to delete the old one and rename the new one later if desired. The only reason I can think of *not* to do it this way is if your disk space is highly constrained, or if your MNE-Python environment has a lot of extra packages added that aren't in our environment.yml file (in which case it might be a bit annoying to have to manually re-install those afterward).

-- dan
Daniel McCloy
https://dan.mccloy.info
Research Scientist
Institute for Learning and Brain Sciences
University of Washington

??? Original Message ???

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Hi Dan,
I tried creating a new environment, and I'm still getting the dipy error.
I'll try again removing the dipy line...
Thanks,
Megan

conda env create --name mne --file environment.yml
Using Anaconda Cloud api site https://api.anaconda.org
Fetching package metadata ...........
Solving package specifications: .
pyzmq-19.0.1-p 100%

#######################################################################################################|

Time: 0:00:00 2.75 MB/s
jedi-0.17.2-py 100%

#######################################################################################################|

Time: 0:00:00 7.84 MB/s
ERROR: Invalid requirement: 'dipy --only-binary dipy'

CondaValueError: pip returned an error.

MEG Technician
The Mind Research Network
1101 Yale Blvd. NE
Albuquerque, New Mexico 87106

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Hi all,
I am getting the same PyQt5 error when I try the install via create
environment.
So attempting to creating a new environment did nothing to solve either of
the errors I was getting trying to update the environment.
In the new environment, I can import the mne module, but it doesn't have a
.__version__ attribute or a .sysinfo() attribute, so it's still broken.

I also heard back from the dipy devs that the environment line for dipy is
wrong. They suggest either drop either the first or second 'dipy', see
their response below... Has anyone had success using the environment.yml
file on the mne install page with the dipy dependency as written? I guess
I'll also try to check with the PyQt5 devs to see about the error I'm
getting on that.

Thanks for any help,
Megan

PyQt5 error...
Collecting PyQt5>=5.10
  Using cached PyQt5-5.15.0.tar.gz (3.3 MB)
  Installing build dependencies: started
  Installing build dependencies: finished with status 'done'
  Getting requirements to build wheel: started
  Getting requirements to build wheel: finished with status 'done'
    Preparing wheel metadata: started
    Preparing wheel metadata: finished with status 'error'
    ERROR: Command errored out with exit status 1:
     command:
/export/research/analysis/human/jstephen/shared/programs/python/anaconda3/envs/mne/bin/python
/export/research/analysis/human/jstephen/shared/programs/python/anaconda3/envs/mne/lib/python3.8/site-packages/pip/_vendor/pep517/_in_process.py
prepare_metadata_for_build_wheel /tmp/tmpdqxe1zsu
         cwd: /tmp/pip-install-02yoibkc/pyqt5
    Complete output (35 lines):
    Querying qmake about your Qt installation...

/export/research/analysis/human/jstephen/shared/programs/python/anaconda3/bin/qmake
-query
    Traceback (most recent call last):
      File
"/export/research/analysis/human/jstephen/shared/programs/python/anaconda3/envs/mne/lib/python3.8/site-packages/pip/_vendor/pep517/_in_process.py",
line 126, in prepare_metadata_for_build_wheel
        hook = backend.prepare_metadata_for_build_wheel
    AttributeError: module 'sipbuild.api' has no attribute
'prepare_metadata_for_build_wheel'

    During handling of the above exception, another exception occurred:

    Traceback (most recent call last):
      File
"/export/research/analysis/human/jstephen/shared/programs/python/anaconda3/envs/mne/lib/python3.8/site-packages/pip/_vendor/pep517/_in_process.py",
line 280, in <module>
        main()
      File
"/export/research/analysis/human/jstephen/shared/programs/python/anaconda3/envs/mne/lib/python3.8/site-packages/pip/_vendor/pep517/_in_process.py",
line 263, in main
        json_out['return_val'] = hook(**hook_input['kwargs'])
      File
"/export/research/analysis/human/jstephen/shared/programs/python/anaconda3/envs/mne/lib/python3.8/site-packages/pip/_vendor/pep517/_in_process.py",
line 130, in prepare_metadata_for_build_wheel
        return _get_wheel_metadata_from_wheel(backend, metadata_directory,
      File
"/export/research/analysis/human/jstephen/shared/programs/python/anaconda3/envs/mne/lib/python3.8/site-packages/pip/_vendor/pep517/_in_process.py",
line 159, in _get_wheel_metadata_from_wheel
        whl_basename = backend.build_wheel(metadata_directory,
config_settings)
      File
"/tmp/pip-build-env-6gc1wdbn/overlay/lib/python3.8/site-packages/sipbuild/api.py",
line 51, in build_wheel
        project = AbstractProject.bootstrap('pep517')
      File
"/tmp/pip-build-env-6gc1wdbn/overlay/lib/python3.8/site-packages/sipbuild/abstract_project.py",
line 82, in bootstrap
        project.setup(pyproject, tool, tool_description)
      File
"/tmp/pip-build-env-6gc1wdbn/overlay/lib/python3.8/site-packages/sipbuild/project.py",
line 479, in setup
        self.apply_user_defaults(tool)
      File "project.py", line 62, in apply_user_defaults
        super().apply_user_defaults(tool)
      File
"/tmp/pip-build-env-6gc1wdbn/overlay/lib/python3.8/site-packages/pyqtbuild/project.py",
line 89, in apply_user_defaults
        super().apply_user_defaults(tool)
      File
"/tmp/pip-build-env-6gc1wdbn/overlay/lib/python3.8/site-packages/sipbuild/project.py",
line 225, in apply_user_defaults
        self.builder.apply_user_defaults(tool)
      File
"/tmp/pip-build-env-6gc1wdbn/overlay/lib/python3.8/site-packages/pyqtbuild/builder.py",
line 77, in apply_user_defaults
        self._get_qt_configuration()
      File
"/tmp/pip-build-env-6gc1wdbn/overlay/lib/python3.8/site-packages/pyqtbuild/builder.py",
line 450, in _get_qt_configuration
        raise UserException(
    sipbuild.exceptions.UserException

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Hi all,
The PyQt5 list helped me track down that error a bit more. The wheel build
for PyQt5 depends on something called manylinux2014, which depends on
CentOS7. The server I'm trying to use is CentOS 6.7.

It sounds like my environment/pip dipy issue is related to the anaconda
version I have (may also be why mne was broken when I tried to create the
environment).
There are issues with the environment file using pip in older anaconda
versions <Issues · conda/conda · GitHub.
However, this is after I do "conda update --all" in my mne environment.
I'm having trouble figuring out how to get a newer anaconda package. The
mne install page suggests conda version 4.6.2. It looks like I have
4.3.30. The github issue page says the pip options issue is fixed with
4.6.9
Sorry to ask a conda question here, but when I try "conda update anaconda"
I get an error saying "PackageNotInstalledError: Package is not installed
in prefix." From searching, it sounds like I need to update my base/root
anaconda environment, but I'm not sure I want to do that?

Also, FWIW I was able to get dipy to install using "pip install dipy
--only-binary dipy", which sort of led me down the rabbit hole of why my
environment didn't seem to be working with the pip options... I was also
able to install mne using pip.

Just thought I'd update. It seems it is an issue with my system, not with
your environment file.
Thanks,
Megan

conda info
Current conda install:

               platform : linux-64
          conda version : 4.3.30
       conda is private : False
      conda-env version : 4.3.30
    conda-build version : 1.19.0
         python version : 3.5.4.final.0
       requests version : 2.12.4
       root environment :
/export/research/analysis/human/jstephen/shared/programs/python/anaconda3
(writable)
    default environment :
/export/research/analysis/human/jstephen/shared/programs/python/anaconda3/envs/mne
       envs directories :
/export/research/analysis/human/jstephen/shared/programs/python/anaconda3/envs
                          /na/homes/mschendel/.conda/envs
          package cache :
/export/research/analysis/human/jstephen/shared/programs/python/anaconda3/pkgs
                          /na/homes/mschendel/.conda/pkgs
           channel URLs : main/linux-64
                          main/noarch
                          Anaconda packages for Linux x86_64 (64-bit)
                          Anaconda packages (noarch)
                          r/linux-64
                          r/noarch
                          Anaconda extras for Linux x86_64 (64-bit)
                          Anaconda extras (noarch)
            config file : None
             netrc file : None
           offline mode : False
             user-agent : conda/4.3.30 requests/2.12.4 CPython/3.5.4
Linux/2.6.32-573.7.1.el6.x86_64 CentOS/6.7 glibc/2.12
                UID:GID : 10263:8000

I was able to get dipy to install...

(mne) [mschendel at earth python]$ pip --version
pip 20.2.2 from
/export/research/analysis/human/jstephen/shared/programs/python/anaconda3/envs/mne/lib/python3.8/site-packages/pip
(python 3.8)

(mne) [mschendel at earth envs]$ pip install dipy --only-binary dipy
Collecting dipy
  Using cached dipy-1.1.1-cp38-cp38-manylinux1_x86_64.whl (8.0 MB)
Collecting nibabel>=3.0.0
  Using cached nibabel-3.1.1-py3-none-any.whl (3.3 MB)
Requirement already satisfied: scipy>=1.0 in
./mne/lib/python3.8/site-packages (from dipy) (1.5.2)
Requirement already satisfied: h5py>=2.4.0 in
./mne/lib/python3.8/site-packages (from dipy) (2.10.0)
Requirement already satisfied: numpy>=1.13 in
./mne/lib/python3.8/site-packages (from nibabel>=3.0.0->dipy) (1.19.1)
Requirement already satisfied: packaging>=14.3 in
./mne/lib/python3.8/site-packages (from nibabel>=3.0.0->dipy) (20.4)
Requirement already satisfied: six in ./mne/lib/python3.8/site-packages
(from h5py>=2.4.0->dipy) (1.15.0)
Requirement already satisfied: pyparsing>=2.0.2 in
./mne/lib/python3.8/site-packages (from

=14.3->nibabel>=3.0.0->dipy) (2.4.7)

Installing collected packages: nibabel, dipy
Successfully installed dipy-1.1.1 nibabel-3.1.1

Here's where I am now:
mne.sys_info()
Platform: Linux-2.6.32-573.7.1.el6.x86_64-x86_64-with-glibc2.10
Python: 3.8.5 (default, Sep 4 2020, 07:30:14) [GCC 7.3.0]
Executable:
/export/research/analysis/human/jstephen/shared/programs/python/anaconda3/envs/mne/bin/python3
CPU: x86_64: 24 cores
Memory: 126.0 GB

mne: 0.20.8
numpy: 1.19.1 {blas=mkl_rt, lapack=mkl_rt}
scipy: 1.5.2
matplotlib: 3.3.1 {backend=agg}

sklearn: 0.23.2
numba: 0.50.1
nibabel: 3.1.1
cupy: Not found
pandas: 1.1.1
dipy: 1.1.1
mayavi: Not found
pyvista: Not found
vtk: Not found

MEG Technician
The Mind Research Network
1101 Yale Blvd. NE
Albuquerque, New Mexico 87106

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hi Megan,

thanks for the details. Unfortunately it's going to be really hard to
debug for us
without accessing your system. Note however that you can still use mne-python
with just numpy, scipy and matplotlib. It will cover 90% of what you can do with
mne-python. What you will not have is 3D support but if it's remove compute
cluster maybe it's not a real issue.

Alex

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I would just remove the `dipy` line from the environment file to see if
that will install properly. If it doesn't, you could iteratively remove
requirements or as Alex says, try just installing numpy, scipy, matplotlib,
and mne.

FYI CentOS 6 reaches end-of-life for even security updates in November, so
it might not be a bad time to consider upgrading. (Of course this is not
the easiest solution, though!)

Eric

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Hi Alexandre, Eric,
Thanks for the responses.
I will see what I can accomplish without the offending packages (I got dipy
to install, but no luck with PyQt yet). I was trying to help a
colleague with the Visualize Source Time Courses tutorial, so we'll see
what errors we run into.
I found an anaconda user group, so I will ask them about why I cannot seem
to update my conda version.

Thanks again,
Megan

MEG Technician
The Mind Research Network
1101 Yale Blvd. NE
Albuquerque, New Mexico 87106

External Email - Use Caution

Hi all,
I managed to install a new anaconda package.
I tried modifying the environment file to leave off dipy and PyQt, but I
discovered I also can't install pyvistaqt. I actually was able to include
dipy once I got the updated conda.

However, now I'm getting an error using mne.sys_info(), and I can't use
that command over a terminal without X11 forwarding (I am working remotely,
so sometimes it's nice to just work on the python terminal and not get
slowed down with the graphics forwarding). Not a deal breaker, though.

From what I can tell from the mne.sys_info, it looks like some form of pyqt
installed

conda --version && python --version
conda 4.8.4
Python 3.8.5

I created an environment from everything in the environment file under
dependencies and with just mne for pip. Then I iteratively updated the
environment, adding one line to the list of pip installs from the
environment file at a time. I got some errors with pyvistaqt and PyQt.

Just terminal:
mne.sys_info()
QStandardPaths: XDG_RUNTIME_DIR not set, defaulting to
'/tmp/runtime-mschendel'
qt.qpa.screen: QXcbConnection: Could not connect to display
Could not connect to any X display.

(ipython3 quits)

Using python over a vnc with X11 forwarding enabled...
mne.sys_info()
QStandardPaths: XDG_RUNTIME_DIR not set, defaulting to
'/tmp/runtime-mschendel'
Platform: Linux-2.6.32-573.7.1.el6.x86_64-x86_64-with-glibc2.10
Python: 3.8.5 (default, Sep 4 2020, 07:30:14) [GCC 7.3.0]
Executable:
/export/research/analysis/human/jstephen/shared/programs/python/anaconda_072020/new/envs/mne20/bin/python
CPU: x86_64: 24 cores
Memory: 126.0 GB

mne: 0.20.8
numpy: 1.19.1 {blas=mkl_rt, lapack=mkl_rt}
scipy: 1.5.2
matplotlib: 3.3.1 {backend=Qt5Agg}

sklearn: Not found
numba: 0.50.1
nibabel: 3.1.1
cupy: Not found
pandas: 1.1.1
dipy: 1.1.1
mayavi: 4.7.2 {qt_api=pyqt5, PyQt5=5.9.2}
pyvista: 0.26.0
vtk: 9.0.1

I also tried to create an environment without pyvistaqt and PyQt.
mne.sys_info() looks identical
Successfully installed PySurfer-0.11.0 appdirs-1.4.4 apptools-4.5.0
configobj-5.0.6 dipy-1.1.1 envisage-4.9.2 imageio-ffmpeg-0.4.2 mayavi-4.7.2
meshio-4.2.0 mne-0.20.8 neo-0.8.0 nibabel-3.1.1 nilearn-0.6.2
python-picard-0.4 pyvista-0.26.0 quantities-0.12.4 scooby-0.5.6 sklearn-0.0
vtk-9.0.1

Megan
MEG Technician
The Mind Research Network
1101 Yale Blvd. NE
Albuquerque, New Mexico 87106