ssd variances

在SSD中，variances是用来编码先验框变回归系数的。variances是一个长度为2的列表，包含了两个参数。第一个参数是平移系数的方差，第二个参数是缩放系数的方差。通过将匹配的真实标签与先验框之间的差值除以variances，可以得到平移系数和缩放系数。平移系数用于计算目标框中心点的偏移量，缩放系数用于计算目标框的尺度变化。这样，通过计算回归系数，可以将先验框转换为与真实目标框更加接近的预测框。<span class="em">1</span><span class="em">2</span><span class="em">3</span>
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