got missing from current font warning when train Chinese names images

[gaoyanzeng]

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• I have searched the YOLOv5 issues and found no similar bug report.

YOLOv5 Component

Training

Bug

Got warning as below:
metrics.py:199: UserWarning: Glyph 31888 (\N{CJK UNIFIED IDEOGRAPH-7C90}) missing from current font.
fig.savefig(Path(save_dir) / 'confusion_matrix.png', dpi=250)

All I changed is in the ./data/coco128.yaml as below:

Classes

nc: 4 # number of classes
names: ['翘头剪', '直剪', '止血钳', '组织钳'] # class names

Environment

OS: Windows 11
Python: 3.9.5

Minimal Reproducible Example

No response

Additional

No response

Are you willing to submit a PR?

• Yes I'd like to help by submitting a PR!

[github-actions]

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[glenn-jocher]

@gaoyanzeng warnings are not errors and can be safely ignored if they do not impact performance. Does this cause any problems in your workflow?

[glenn-jocher]

@gaoyanzeng I investigated a bit, seems like Unicode Arial.ttf is not downloading as it should for Chinese fonts usage. I'll add a TODO to investigate further.

[glenn-jocher]

[gaoyanzeng]

thank you very much

[gaoyanzeng]

It can't plot chinese correctly when use "fig.savefig(Path(save_dir) / 'confusion_matrix.png', dpi=250)" in the 191 line of utils/metrics.py

[glenn-jocher]

@gaoyanzeng yeah I see that. It looks like PIL image plotting with Chinese fonts is working correctly now after some updates in #6526 but matplotlib plotting is separate and needs to specify Arial.Unicode.tty as well. I should have a fix for this soon.

[glenn-jocher]

TODO: Fix matplotlib plots for Chinese characters

[gaoyanzeng]

Thank you very much, looking forward to your work fix this problem.