Speedup FP16 Gelu op using fast math and vectorized 8 kernel #38980
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在PR描述里可否提供更详细的性能测试结果：(1) 56*seq_len的取值范围更广一些（比如，seq_len_in_batch为30几，40几在真实数据中也是有的） （2）添加与nv mlperf 1.1中 jit gelu的对比 |
limin2021
approved these changes
Jan 17, 2022
lanxianghit
approved these changes
Jan 18, 2022
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PR types
Performance optimization
PR changes
OPs
Describe
Speed up FP16 op using: (1) vectorized 8 kernel, since GPU has PTX
ldinstruction to load 4x32bit data; (2) use the PTX fast tanhf instructiontanh.approx.fp32to speed up thetanhffunction. It is enabled whenFLAGS_use_fast_math=1.