cuda.manual_seed_all(seed)

This function sets the seed for all CUDA devices to a specified value. The seed is used to initialize the random number generator, which is used by various functions in the CUDA library. By setting the same seed value, one can ensure that the results of those functions are reproducible across different runs of the program.

The `seed` parameter is an integer value that specifies the seed to use. The value can be any integer, but it is recommended to use a value that is easy to remember and unique to the program. It is also recommended to set the seed at the beginning of the program, before any CUDA operations are performed.

Example usage:

import torch
torch.cuda.manual_seed_all(42)

This sets the seed for all CUDA devices to 42.