Remove the Python version constraint for PyTorch (optuna#5278)

* Remove version constraint for pytorch

* Remove import sys

pyproject.toml

@@ -96,8 +96,7 @@ optional = [
   "scikit-learn>=0.24.2",
   # optuna/visualization/param_importances.py.
   "scipy",  # optuna/samplers/_gp
-  # TODO(contramundum53): Remove the constraint after torch supports python 3.12.
-  "torch; python_version<='3.11'",  # optuna/samplers/_gp
+  "torch",  # optuna/samplers/_gp
 ]
 test = [
   "coverage",
@@ -106,8 +105,7 @@ test = [
   "moto",
   "pytest",
   "scipy>=1.9.2; python_version>='3.8'",
-  # TODO(contramundum53): Remove the constraint after torch supports python 3.12.
-  "torch; python_version<='3.11'",
+  "torch",
 ]
 
 [project.urls]

tests/gp_tests/test_acqf.py

@@ -1,15 +1,7 @@
 from __future__ import annotations
 
-import sys
-
 import numpy as np
 import pytest
-
-
-# TODO(contramundum53): Remove this block after torch supports Python 3.12.
-if sys.version_info >= (3, 12):
-    pytest.skip("PyTorch does not support python 3.12.", allow_module_level=True)
-
 import torch
 
 from optuna._gp.acqf import AcquisitionFunctionType

tests/samplers_tests/test_samplers.py

@@ -6,7 +6,6 @@
 from multiprocessing.managers import DictProxy
 import os
 import pickle
-import sys
 from typing import Any
 from unittest.mock import patch
 import warnings
@@ -35,8 +34,6 @@
 def get_gp_sampler(
     *, n_startup_trials: int = 0, seed: int | None = None
 ) -> optuna.samplers.GPSampler:
-    if sys.version_info >= (3, 12, 0):
-        pytest.skip("PyTorch does not support Python 3.12 yet.")
     return optuna.samplers.GPSampler(n_startup_trials=n_startup_trials, seed=seed)
 
 
@@ -1024,10 +1021,6 @@ def restore_seed() -> None:
 @pytest.mark.slow
 @parametrize_sampler_name_with_seed
 def test_reproducible_in_other_process(sampler_name: str, unset_seed_in_test: None) -> None:
-    # TODO(HideakiImamura): Remove the constraint after torch supports python 3.12.
-    if sys.version_info >= (3, 12, 0) and sampler_name == "GPSampler":
-        pytest.skip("PyTorch does not support Python 3.12 yet.")
-
     # This test should be tested without `PYTHONHASHSEED`. However, some tool such as tox
     # set the environmental variable "PYTHONHASHSEED" by default.
     # To do so, this test calls a finalizer: `unset_seed_in_test`.