Fix Layer.to() of device bug #37156
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Fix Layer.to() of device bug #37156
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zhangbo9674 force-pushed the dev/fix_layer_to_bug branch from f8534da to 3ac4689 Compare 
zhangbo9674 added a commit to zhangbo9674/Paddle that referenced this pull request Dec 12, 2021
zhangbo9674 added a commit to zhangbo9674/Paddle that referenced this pull request Dec 13, 2021
lanxianghit pushed a commit that referenced this pull request Dec 13, 2021
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PR types
Bug fixes
PR changes
APIs
Describe
PR 36862 重构了Layer.to的逻辑，解决了做数据类型转换时，存在的显存增长问题。
原始layer.to存在一个bug：同时修改place和dtype将存在bug，例如：在框架的device设置为place1，通过copy_to()得到place2上的数据new_t，则在place1上对place2上的new_t调用cast操作存在bug。
本pr修复了上述bug：