[ImgBot] Optimize images

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/site/en/guide/images/sparse_tensor.png -- 24.79kb -> 5.93kb (76.07%)
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/site/en/tutorials/understanding/images/sngp.png -- 46.06kb -> 35.33kb (23.3%)
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/site/en/guide/images/tensor/matrix.png -- 2.77kb -> 2.24kb (19.37%)
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/site/en/r1/tutorials/images/images/fine_tuning.png -- 47.09kb -> 39.88kb (15.3%)
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/site/en/tutorials/generative/images/adversarial_example.png -- 179.31kb -> 152.19kb (15.12%)
/site/en/tutorials/generative/images/cvae_latent_space.jpg -- 113.92kb -> 97.97kb (13.99%)
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/site/en/tutorials/generative/images/kadinsky-turtle.png -- 488.25kb -> 422.22kb (13.52%)
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