【PaddlePaddle Hackathon 3 No.48】为 Paddle 新增 elementwise pow raw 支持 float16

[xiaohemaikoo]

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elementwise pow raw support float16

[paddle-bot]

你的PR提交成功，感谢你对开源项目的贡献!
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[CLAassistant]

Thank you for your submission! We really appreciate it. Like many open source projects, we ask that you sign our Contributor License Agreement before we can accept your contribution.
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[CLAassistant]

Thank you for your submission! We really appreciate it. Like many open source projects, we ask that you sign our Contributor License Agreement before we can accept your contribution.
_{You have signed the CLA already but the status is still pending? Let us recheck it.}

[paddle-bot]

很抱歉，经过我们的反复讨论，你的PR暂未达到合入标准，请阅读飞桨原生算子开发规范，你可以重新提交新的PR，我们先将此PR关闭，感谢你的贡献。
Sorry to inform you that through our discussion, your PR fails to meet the merging standard (Reference: Paddle Custom Operator Design Doc). You can also submit an new one. Thank you.

[luotao1]

@xiaohemaikoo 这个PR的内容在#45496 中已经包含，我们将关闭这个PR，只审核 #45496