`chainer.get_device(10)` does not cause error

Testing under chainer==6.0.0 with chainerx built and cupy installed. Testing environment has only 1 GPU.

import chainer


device = chainer.get_device(10)          # NOT Cause error!
print('device', device)  # @cupy:10
device2 = chainer.get_device('cuda:10')  # Cause error!
print('device2', device2)

When we try to get GPU device with id more than allowed, the behavior is different between cupy & chainerx cuda device.

• cupy: does not raise error
• chainerx cuda: raise error

I think raising error is more convenient for users. How do you think?

[emcastillo]

#7486 correct the pickle behavior by re-creating the lock when the object is deserialized.

[stale[bot]]

This issue is closed as announced. Feel free to re-open it if needed.