[debug] Expected to have finished reduction in the prior iteration before starting a new one.
问题描述
训练网络时出现错误：
RuntimeError: Expected to have finished reduction in the prior iteration before starting a new one.
原因分析
参考该issue
I met the same issue.
But i solved it.
The reason is that in my model class, I define a fpn module with 5 level output feature maps in the init function,
but in forward function I only use 4 of them.
When I use all of them, the problem was solved.
This is my supposed conclusion: you should use all output of each module in forward function.
简单来说，就是在网络中定义了module，但没有使用
当然，这个module可以使最简单的网络层，也可以是更复杂的结构
解决方案
找到定义但没有使用的module，要么删掉，要么使用
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