[PaddlePaddle Hackathon] add image augment algorithms #9
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以上所有算法均使用批处理方式进行,避免在 Python 中调用低效的 for 循环,其中后三种滤波方式使用 paddle.nn.functional.conv2d 实现,边缘直接使用 pad 0 后卷积,未作 OpenCV 中的那些特殊处理,但非边缘部分处理效果与直接调用 OpenCV 效果一致~