pickle error.. using chainercv with chainermn

[MannyKayy]

Hi,

I am trying to use chainercv with chainermn.

I used chainercv with some of my new projects and when i attempt to distribute training using chainermn, I receive the following error from the scatter_dataset method. All i am doing is applying a random_flip transform to the training data. I get the error for all my projects that use chainercv and have replicated it using the chainermn mnist example file .

I'm not sure as to where to raise this issue so I have raised it in both the chainercv and chainermn repos.

[yuyu2172]

The error occurred because function objects can not be pickled.
We will look into a way to fix this issue. Thank you very much for reporting.

[yuyu2172]

Hi. Sorry for the late reply.
Since pickling is the issue, can you put the transform function outside of the main function?

A function can be picklable as long as it is not declared inside another function.