为什么会出现max value和min value的打印

[zxj329]

min value is tensor(-1.4942, device='cuda:4', grad_fn=)
max value is tensor(1.1255, device='cuda:4', grad_fn=)
min value is tensor(-1.1132, device='cuda:1', grad_fn=)
min value is tensor(-1.6516, device='cuda:2', grad_fn=)
max value is tensor(1.9925, device='cuda:1', grad_fn=)
max value is tensor(2.3401, device='cuda:2', grad_fn=)
max value is tensor(1.1255, device='cuda:3', grad_fn=)
min value is tensor(-1.0370, device='cuda:0', grad_fn=)
min value is tensor(-1.1285, device='cuda:5', grad_fn=)
max value is tensor(1.1400, device='cuda:6', grad_fn=)
min value is tensor(-1.0158, device='cuda:6', grad_fn=)
min value is tensor(-1.2950, device='cuda:3', grad_fn=)
max value is tensor(1.0853, device='cuda:6', grad_fn=)
max value is tensor(1.5039, device='cuda:3', grad_fn=)
min value is tensor(-1.0030, device='cuda:2', grad_fn=)
max value is tensor(1.0599, device='cuda:2', grad_fn=)
min value is tensor(-1.4421, device='cuda:5', grad_fn=)
max value is tensor(1.3636, device='cuda:5', grad_fn=)
min value is tensor(-1.3218, device='cuda:4', grad_fn=)
max value is tensor(1.0183, device='cuda:4', grad_fn=)