matrixprofile.analyze() raises AttributeError with matplotlib==3.5.0

[sbetko]

Running matrixprofile.analyze() causes AttributeError: 'NoneType' object has no attribute 'get_subplotspec' when matplotlib version 3.5.0 is installed. All plots seem to be shown correctly, but due to the exception, the function never returns. Upgrading to matplotlib 3.5.1 resolves the issue.

The matrixprofile package lists matplotlib>=3.0.3 in requirements.txt. I haven't tested any other versions for this issue, but it might be worth adding matplotlib!=3.5.0 to the package requirements if this is a matplotlib bug and can't be fixed in matrixprofile itself.

To Reproduce
Environment setup:

python3.9 -m venv env
source env/bin/activate
pip install --upgrade pip
pip install matrixprofile ipykernel matplotlib==3.5.0

Run the following in an IPython notebook:

import numpy as np
import matrixprofile as mp

np.random.seed(1)
vals = np.random.randn(500)
profile, figures = mp.analyze(vals)

It should throw an AttributeError. Then, restart the kernel, upgrade matplotlib with pip install matplotlib==3.5.1, and rerun the cell (it should run successfully).

Expected behavior
matrixprofile.analyze() returns without any errors on both matplotlib 3.5.0 and 3.5.1.

Desktop

• OS: MacOS 12.0.1
• Python: 3.9.6