The kernel appears to have died.

解决方案：conda install freetype=2.10.4

https://www.youtube.com/watch?v=6D33x_eQt2U
The kernel appears to have died. It will restart automatically. [MATPLOTLIB问题]

$ conda list freetype
# packages in environment at /GPFS/*/envs/cell2loc_env:
#
# Name                    Version                   Build  Channel
freetype                  2.10.4               h0708190_1    https://mirrors.tuna.tsinghua.edu.cn/anaconda/cloud/conda-forge