[ImgBot] Optimize images

[imgbot[bot]]

Beep boop. Your images are optimized!

Your image file size has been reduced by 16% 🎉

Details

File	Before	After	Percent reduction
/save/fed_mnist_cnn_2_C0.1_iidTrue.png	18.34kb	13.03kb	28.94%
/save/fed_mnist_mlp_2_C0.1_iidFalse.png	17.10kb	12.20kb	28.65%
/test_figures/confusion_matrix_non-self_balanced_size.png	48.44kb	40.95kb	15.46%
/save/fed_mnist_mlp_10_C0.1_iidFalse.png	13.24kb	11.20kb	15.41%
/test_figures/confusion_matrix_self_balanced_size.png	45.50kb	38.56kb	15.25%
/test_figures/confusion_matrix_non-self_balanced_local.png	47.63kb	40.39kb	15.21%
/test_figures/confusion_matrix_self_balanced_local.png	46.11kb	39.38kb	14.58%
/test_figures/confusion_matrix_non-self_balanced_global.png	46.89kb	40.23kb	14.21%
/test_figures/confusion_matrix_self_balanced_global.png	44.21kb	37.95kb	14.16%
Total :	327.46kb	273.90kb	16.36%

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