Fix pytl ddp bug #805
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Fix pytl ddp bug #805
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修复使用pytorch lightning的swanlab日志集成时，使用多卡训练会出现self. _experiment未声明问题。
修复方法
在pytorch lightning的日志收集器逻辑中，初始化日志记录器只在master进程中调用，因此要在init中预先将self. _experiment赋值为none