Fixes race condition for multinode during folder creation

[jomitchellnv]

Inside tasks.py the following line exists for creating folders.

if not os.path.exists(out_dir):
        os.makedirs(out_dir)

However, if you have a multi-node system running, this may happen.

Process 0 checks os.path.exists(out_dir) → returns False
Process 1 checks os.path.exists(out_dir) → returns False
Process 0 calls os.makedirs(out_dir) → succeeds
Process 1 calls os.makedirs(out_dir) → fails with FileExistsError

Thus, the solution here is to use os.makedirs(out_dir, exist_ok=True)