No.47 为 Paddle cross 算子实现 float16 数据类型支持

[404988613]

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Describe

op benchmark

shape	axis	fp32	fp16
2048, 3	1	0.119930141	0.119697561
16, 3, 20480	1	0.136250866	0.124568842
16, 20, 3, 40, 50	2	0.164437537	0.140431219

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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.