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import random
def next_seed(args, root):
if args.seed_behavior == 'iter':
args.seed += 1 if root.seed_internal % args.seed_iter_N == 0 else 0
root.seed_internal += 1
elif args.seed_behavior == 'ladder':
args.seed += 2 if root.seed_internal == 0 else -1
root.seed_internal = 1 if root.seed_internal == 0 else 0
elif args.seed_behavior == 'alternate':
args.seed += 1 if root.seed_internal == 0 else -1
root.seed_internal = 1 if root.seed_internal == 0 else 0
elif args.seed_behavior == 'fixed':
pass # always keep seed the same
else:
args.seed = random.randint(0, 2**32 - 1)
return args.seed
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