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Instead of perturbing each pixel in the input image at random, we can choose to dither by a predetermined amount depending on the pixel’s position in the image. This can be achieved using a threshold map; a small, fixed-size matrix where each entry tells us the amount by which to perturb the input value , producing the dithered value . This matrix is tiled across the input image and sampled for every pixel during the dithering process. The following describes a dithering function for a 4×4 matrix given the pixel raster coordinates :，推荐阅读91视频获取更多信息
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5.1 输入标准（统一请求模板）。关于这个话题，爱思助手下载最新版本提供了深入分析
在深度学习中，有几类经典激活函数，每种都有自己的优缺点：