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In trainer.py in the function "_set_device", the comparison to determine whether to use cpu or gpu is done inside the loop with the variable "device_type". If "device_type" is -1, "cpu" would have been added to the list of devices.
However, if "device_type" is -1, an error would have been thrown beforehand, since we tried to iterate over -1.
I assume this is a typo, so changing the variable to compare from "device_type" to the local variable "device" will probably have the intended behaviour.