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Depoly yolov5.ncnn in android.

Results 2 yolov5-ncnn-android issues
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在文件`yolov5_head_ncnn.cpp` 中,第167行计算 `box_score` 的 sigmoid 是不是多余的?因为在下一行代码又对 `box_score` 做了 sigmoid。这样会导致计算出来的 confidence 偏低。 ``` float box_score = sigmoid(feat_blob.channel(q * feat_offset + 4).row(i)[j]); float confidence = sigmoid(box_score) * sigmoid(class_score); ```