[Bug Fix] fix the bug in constrcut Tensor with diference place #75017
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rainyfly
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PR Category
User Experience
PR Types
Bug fixes
Description
问题描述：
当前paddle.Tensor的构造函数中新增了4种构造方式，他们都是依赖于paddle.empty或paddle.tensor去实现的。这两个API会自己检测当前的设备从而去确定设置到哪个place上。但新增的paddle.Tensor()构造方法其实都是希望在不指定device时，创建在CPU上的。
在实现过程中，其实只有在调original_init()的时候设置了device，而在用paddle.empty或paddle.tensor创建Tensor时没有设置device，这就导致了GPU环境下paddle.Tensor()执行时，会先创建GPU的paddle.empty([0])，然后再通过original_init()转化成cpu的Tensor存在拷贝开销。
此外在python/paddle/incubate/multiprocessing/reductions.py中，
这个位置会走一步先empty构造成GPU Tensor再用original_init构造成CPU Tensor的操作。
如果这个函数在multiprocess创建的子进程中调用，则会出现cuda环境初始化失败的现象，进而导致Tensor创建失败。
解决方案：
对于新增的几个构造方法，除了给original_init添加place参数外，还给paddle.empty()和paddle.tensor()里添加device参数，确保创建Tensor的过程中，place保持一致。
pcard-71500