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fp32 gemm存在微小误差 #16

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anaivebird opened this issue Sep 28, 2022 · 2 comments

anaivebird commented Sep 28, 2022

A(i, j) = (2.0 * (float)drand48() - 1.0)
误差为
4.577637e-05

如果数字更大，误差更大

Owner

tpoisonooo commented Oct 2, 2022

这是正常的...原因是数值的表达方式。计算机并不是严格的数学，计算的先后顺序会导致最终结果的不同。

严格意义上， a+b+c != c+b+a

tpoisonooo pinned this issue

Owner

tpoisonooo commented Oct 2, 2022

https://zhuanlan.zhihu.com/p/558723507

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