龙芯2k1000测试yolox模型无法正常运行，yolov5可以运行

[wjdy]

loongson@ls2k:~/Desktop/ncnn/build/examples$ ./yolov5 01.jpg 0 = 0.88773 at 613.13 309.97 129.40 x 293.63 0 = 0.85717 at 717.60 414.13 116.84 x 182.27 0 = 0.83715 at 310.91 331.21 109.08 x 272.36 0 = 0.80530 at 818.37 296.96 71.07 x 209.47 0 = 0.79004 at 874.96 290.36 127.99 x 308.92 2 = 0.77431 at 993.14 334.77 85.86 x 87.92 0 = 0.77314 at 461.77 333.91 74.34 x 262.11 2 = 0.77174 at 91.87 364.67 105.94 x 101.68 0 = 0.70869 at 0.40 366.16 75.08 x 122.26 2 = 0.67867 at 146.39 357.82 287.35 x 151.01 0 = 0.65766 at 739.59 315.20 67.53 x 137.53 2 = 0.63094 at 353.93 347.06 256.41 x 129.11 2 = 0.62434 at 48.99 362.04 66.74 x 61.99 3 = 0.38121 at 5.74 421.51 67.24 x 91.54 0 = 0.34597 at 795.92 336.61 31.88 x 90.78 imshow save image to image.png waitKey stub

loongson@ls2k:~/Desktop/ncnn/build/examples$ ./yolox 01.jpg 浮点数例外