# Copyright 2022 The HuggingFace Team. All rights reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

import pickle
import unittest

import torch

from accelerate import Accelerator
from accelerate.state import AcceleratorState
from accelerate.test_utils import require_cpu


@require_cpu
class OptimizerTester(unittest.TestCase):
    def test_accelerated_optimizer_pickling(self):
        model = torch.nn.Linear(10, 10)
        optimizer = torch.optim.SGD(model.parameters(), 0.1)
        accelerator = Accelerator()
        optimizer = accelerator.prepare(optimizer)
        try:
            pickle.loads(pickle.dumps(optimizer))
        except Exception as e:
            self.fail(f"Accelerated optimizer pickling failed with {e}")
        AcceleratorState._reset_state()