add other 15 activation ops#32622
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Xreki merged 8 commits intoPaddlePaddle:developfrom May 7, 2021
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同上，这种写法会需要2次、3次比较。可以看看：
MPType min = x < t ? x : t;
MPType max = min > -t ? min : -t;不过可能性能也没什么差别。
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所以这个算子也是要求threshold > 0的吧？不知道OP实现里面有没有检查，或者加个注释说明下？
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加了注释，但是我看在api层面好像没有对threshold的正负做限制，感觉也需要加一下，不然为负值时，结果会不确定。
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公式里面使用threshold、offset、scale。貌似python端没把这个几个参数暴露出来，但是op用了这几个参数。
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May 7, 2021
| return {{"threshold", &threshold}}; | ||
| } | ||
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| // hadrshrink(x) = (x > -threshold && x < threshold) ? 0 : x |
| } | ||
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| // hard_sigmoid(x) = 0, when x <= -3 | ||
| // 1, when x >= 3 |
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代码里面是和0、1比较，公式里面是和-3、3比较，是slope=6、offset=-3？
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PR types
Performance optimization
PR changes
OPs
Describe
Unify the implementation of activation operation
本次提交共修改激活算子16个，包括其前向和反向，其中
log 类算子 3 个: log1p, log2, log10
relu 类算子 5 个：brelu, soft_relu, relu6, thresholded_relu, elu
其他 8 个 ：stanh, soft_plus, soft_sign, tanh_shrink, hard_shrink, hard_sigmoid, swish, hard_swish
每种类型算子的性能提升近似，因此选取每个类别中的一个算子作为示例进行描述，如下表：
case配置：[16, 128, 257, 257]