Set a seed of generator with an option for more randomness when training several models with different seeds (#10486)

* set seed with parameter
Signed-off-by: Yonghye Kwon <developer.0hye@gmail.com>

* make seed to be a large number

* set seed with a parameter

* set a seed of dataloader with opt for more randomness
Signed-off-by: Yonghye Kwon <developer.0hye@gmail.com>
Co-authored-by: Glenn Jocher <glenn.jocher@ultralytics.com>