Repository: Lightning-AI/pytorch-lightning
File: src/lightning/fabric/utilities/seed.py (Python)

Code before:
from random import setstate as python_set_rng_state
from typing import Any, Optional

import torch

from lightning.fabric.utilities.imports import _NUMPY_AVAILABLE
from lightning.fabric.utilities.rank_zero import _get_rank, rank_prefixed_message, rank_zero_only, rank_zero_warn

log = logging.getLogger(__name__)


max_seed_value = 4294967295  # 2^32 - 1 (uint32)
min_seed_value = 0


def seed_everything(seed: Optional[int] = None, workers: bool = False, verbose: bool = True) -> int:
    r"""Function that sets the seed for pseudo-random number generators in: torch, numpy, and Python's random module.
    In addition, sets the following environment variables:

    - ``PL_GLOBAL_SEED``: will be passed to spawned subprocesses (e.g. ddp_spawn backend).
    - ``PL_SEED_WORKERS``: (optional) is set to 1 if ``workers=True``.

    Args:
        seed: the integer value seed for global random state in Lightning.
            If ``None``, it will read the seed from ``PL_GLOBAL_SEED`` env variable. If ``None`` and the
            ``PL_GLOBAL_SEED`` env variable is not set, then the seed defaults to 0. If the seed is provided
            but is not in bounds or cannot be cast to int, a ValueError is raised.
        workers: if set to ``True``, will properly configure all dataloaders passed to the
            Trainer with a ``worker_init_fn``. If the user already provides such a function
            for their dataloaders, setting this argument will have no influence. See also:
            :func:`~lightning.fabric.utilities.seed.pl_worker_init_function`.
        verbose: Whether to print a message on each rank with the seed being set.

    """
    if seed is None:
        env_seed = os.environ.get("PL_GLOBAL_SEED")
        if env_seed is None:
            seed = 0
            rank_zero_warn(f"No seed found, seed set to {seed}")
        else:
            try:
                seed = int(env_seed)
            except ValueError:
                raise ValueError(f"Invalid seed specified via PL_GLOBAL_SEED: {repr(env_seed)}")
    elif not isinstance(seed, int):
        seed = int(seed)

    if not (min_seed_value <= seed <= max_seed_value):
        raise ValueError(f"{seed} is not in bounds, numpy accepts from {min_seed_value} to {max_seed_value}")

    if verbose:

Review comment (suggestion):
```suggestion
            ``PL_GLOBAL_SEED`` env variable is not set, then the seed defaults to 0. If seed is
```

Code after:
from random import setstate as python_set_rng_state
from typing import Any, Optional

import torch

from lightning.fabric.utilities.imports import _NUMPY_AVAILABLE
from lightning.fabric.utilities.rank_zero import _get_rank, rank_prefixed_message, rank_zero_only, rank_zero_warn

log = logging.getLogger(__name__)


max_seed_value = 4294967295  # 2^32 - 1 (uint32)
min_seed_value = 0


def seed_everything(seed: Optional[int] = None, workers: bool = False, verbose: bool = True) -> int:
    r"""Function that sets the seed for pseudo-random number generators in: torch, numpy, and Python's random module.
    In addition, sets the following environment variables:

    - ``PL_GLOBAL_SEED``: will be passed to spawned subprocesses (e.g. ddp_spawn backend).
    - ``PL_SEED_WORKERS``: (optional) is set to 1 if ``workers=True``.

    Args:
        seed: the integer value seed for global random state in Lightning.
            If ``None``, it will read the seed from ``PL_GLOBAL_SEED`` env variable. If ``None`` and the
            ``PL_GLOBAL_SEED`` env variable is not set, then the seed defaults to 0. If seed is
            not in bounds or cannot be cast to int, a ValueError is raised.
        workers: if set to ``True``, will properly configure all dataloaders passed to the
            Trainer with a ``worker_init_fn``. If the user already provides such a function
            for their dataloaders, setting this argument will have no influence. See also:
            :func:`~lightning.fabric.utilities.seed.pl_worker_init_function`.
        verbose: Whether to print a message on each rank with the seed being set.

    """
    if seed is None:
        env_seed = os.environ.get("PL_GLOBAL_SEED")
        if env_seed is None:
            seed = 0
            rank_zero_warn(f"No seed found, seed set to {seed}")
        else:
            try:
                seed = int(env_seed)
            except ValueError:
                raise ValueError(f"Invalid seed specified via PL_GLOBAL_SEED: {repr(env_seed)}")
    elif not isinstance(seed, int):
        seed = int(seed)

    if not (min_seed_value <= seed <= max_seed_value):
        raise ValueError(f"{seed} is not in bounds, numpy accepts from {min_seed_value} to {max_seed_value}")

    if verbose: