Received a label value of -1 which is outside the valid range

[soodoshll]

Hi, I was trying to run graph-learn in a distributed setting but met some problems: When I launch four clients and four servers, one of the clients will exit with error message:

InvalidArgumentError (see above for traceback): Received a label value of -1 which is outside the valid

When I use two clients and two servers, the error won't happen.

I've checked the label and none of them is -1.

[jackonan]

Show the code of how you launch the distributed processes.