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import logging
import os.path as osp
import tempfile
from unittest import TestCase
from unittest.mock import Mock
import torch
import torch.nn as nn
from torch.utils.data import Dataset
from mmengine.evaluator import Evaluator
from mmengine.hooks import EMAHook
from mmengine.logging import MMLogger
from mmengine.model import BaseModel, ExponentialMovingAverage
from mmengine.optim import OptimWrapper
from mmengine.registry import DATASETS, MODEL_WRAPPERS
from mmengine.runner import Runner
from mmengine.testing import assert_allclose
class ToyModel(BaseModel):
def __init__(self):
super().__init__()
self.linear = nn.Linear(2, 1)
def forward(self, inputs, data_sample, mode='tensor'):
labels = torch.stack(data_sample)
inputs = torch.stack(inputs)
outputs = self.linear(inputs)
if mode == 'tensor':
return outputs
elif mode == 'loss':
loss = (labels - outputs).sum()
outputs = dict(loss=loss)
return outputs
else:
return outputs
class ToyModel1(ToyModel):
def __init__(self):
super().__init__()
def forward(self, *args, **kwargs):
return super().forward(*args, **kwargs)
class ToyModel2(ToyModel):
def __init__(self):
super().__init__()
self.linear1 = nn.Linear(2, 1)
def forward(self, *args, **kwargs):
return super().forward(*args, **kwargs)
class ToyModel3(ToyModel):
def __init__(self):
super().__init__()
self.linear = nn.Linear(2, 2)
def forward(self, *args, **kwargs):
return super().forward(*args, **kwargs)
@DATASETS.register_module()
class DummyDataset(Dataset):
METAINFO = dict() # type: ignore
data = torch.randn(12, 2)
label = torch.ones(12)
@property
def metainfo(self):
return self.METAINFO
def __len__(self):
return self.data.size(0)
def __getitem__(self, index):
return dict(inputs=self.data[index], data_sample=self.label[index])
class TestEMAHook(TestCase):
def setUp(self):
self.temp_dir = tempfile.TemporaryDirectory()
def tearDown(self):
# `FileHandler` should be closed in Windows, otherwise we cannot
# delete the temporary directory
logging.shutdown()
MMLogger._instance_dict.clear()
self.temp_dir.cleanup()
def test_ema_hook(self):
device = 'cuda:0' if torch.cuda.is_available() else 'cpu'
model = ToyModel1().to(device)
evaluator = Evaluator([])
evaluator.evaluate = Mock(return_value=dict(acc=0.5))
runner = Runner(
model=model,
train_dataloader=dict(
dataset=dict(type='DummyDataset'),
sampler=dict(type='DefaultSampler', shuffle=True),
batch_size=3,
num_workers=0),
val_dataloader=dict(
dataset=dict(type='DummyDataset'),
sampler=dict(type='DefaultSampler', shuffle=False),
batch_size=3,
num_workers=0),
val_evaluator=evaluator,
work_dir=self.temp_dir.name,
optim_wrapper=OptimWrapper(
torch.optim.Adam(ToyModel().parameters())),
train_cfg=dict(by_epoch=True, max_epochs=2, val_interval=1),
val_cfg=dict(),
default_hooks=dict(logger=None),
custom_hooks=[dict(type='EMAHook', )],
experiment_name='test1')
runner.train()
for hook in runner.hooks:
if isinstance(hook, EMAHook):
self.assertTrue(
isinstance(hook.ema_model, ExponentialMovingAverage))
self.assertTrue(
osp.exists(osp.join(self.temp_dir.name, 'epoch_2.pth')))
checkpoint = torch.load(osp.join(self.temp_dir.name, 'epoch_2.pth'))
self.assertTrue('ema_state_dict' in checkpoint)
self.assertTrue(checkpoint['ema_state_dict']['steps'] == 8)
# load and testing
runner = Runner(
model=model,
test_dataloader=dict(
dataset=dict(type='DummyDataset'),
sampler=dict(type='DefaultSampler', shuffle=True),
batch_size=3,
num_workers=0),
test_evaluator=evaluator,
test_cfg=dict(),
work_dir=self.temp_dir.name,
load_from=osp.join(self.temp_dir.name, 'epoch_2.pth'),
default_hooks=dict(logger=None),
custom_hooks=[dict(type='EMAHook')],
experiment_name='test2')
runner.test()
@MODEL_WRAPPERS.register_module()
class DummyWrapper(BaseModel):
def __init__(self, model):
super().__init__()
self.module = model
def forward(self, *args, **kwargs):
return self.module(*args, **kwargs)
# with model wrapper
runner = Runner(
model=DummyWrapper(ToyModel()),
test_dataloader=dict(
dataset=dict(type='DummyDataset'),
sampler=dict(type='DefaultSampler', shuffle=True),
batch_size=3,
num_workers=0),
test_evaluator=evaluator,
test_cfg=dict(),
work_dir=self.temp_dir.name,
load_from=osp.join(self.temp_dir.name, 'epoch_2.pth'),
default_hooks=dict(logger=None),
custom_hooks=[dict(type='EMAHook')],
experiment_name='test3')
runner.test()
# Test load checkpoint without ema_state_dict
ckpt = torch.load(osp.join(self.temp_dir.name, 'epoch_2.pth'))
ckpt.pop('ema_state_dict')
torch.save(ckpt,
osp.join(self.temp_dir.name, 'without_ema_state_dict.pth'))
runner = Runner(
model=DummyWrapper(ToyModel()),
test_dataloader=dict(
dataset=dict(type='DummyDataset'),
sampler=dict(type='DefaultSampler', shuffle=True),
batch_size=3,
num_workers=0),
test_evaluator=evaluator,
test_cfg=dict(),
work_dir=self.temp_dir.name,
load_from=osp.join(self.temp_dir.name,
'without_ema_state_dict.pth'),
default_hooks=dict(logger=None),
custom_hooks=[dict(type='EMAHook')],
experiment_name='test4')
runner.test()
# Test does not load ckpt strict_loadly.
# Test load checkpoint without ema_state_dict
runner = Runner(
model=ToyModel2(),
test_dataloader=dict(
dataset=dict(type='DummyDataset'),
sampler=dict(type='DefaultSampler', shuffle=True),
batch_size=3,
num_workers=0),
test_evaluator=evaluator,
test_cfg=dict(),
work_dir=self.temp_dir.name,
load_from=osp.join(self.temp_dir.name, 'epoch_2.pth'),
default_hooks=dict(logger=None),
custom_hooks=[dict(type='EMAHook', strict_load=False)],
experiment_name='test5')
runner.test()
# Test does not load ckpt strict_loadly.
# Test load checkpoint without ema_state_dict
# Test with different size head.
runner = Runner(
model=ToyModel3(),
test_dataloader=dict(
dataset=dict(type='DummyDataset'),
sampler=dict(type='DefaultSampler', shuffle=True),
batch_size=3,
num_workers=0),
test_evaluator=evaluator,
test_cfg=dict(),
work_dir=self.temp_dir.name,
load_from=osp.join(self.temp_dir.name,
'without_ema_state_dict.pth'),
default_hooks=dict(logger=None),
custom_hooks=[dict(type='EMAHook', strict_load=False)],
experiment_name='test5.1')
runner.test()
# Test enable ema at 5 epochs.
runner = Runner(
model=model,
train_dataloader=dict(
dataset=dict(type='DummyDataset'),
sampler=dict(type='DefaultSampler', shuffle=True),
batch_size=3,
num_workers=0),
val_dataloader=dict(
dataset=dict(type='DummyDataset'),
sampler=dict(type='DefaultSampler', shuffle=False),
batch_size=3,
num_workers=0),
val_evaluator=evaluator,
work_dir=self.temp_dir.name,
optim_wrapper=OptimWrapper(
torch.optim.Adam(ToyModel().parameters())),
train_cfg=dict(by_epoch=True, max_epochs=10, val_interval=1),
val_cfg=dict(),
default_hooks=dict(logger=None),
custom_hooks=[dict(type='EMAHook', begin_epoch=5)],
experiment_name='test6')
runner.train()
state_dict = torch.load(
osp.join(self.temp_dir.name, 'epoch_4.pth'), map_location='cpu')
self.assertIn('ema_state_dict', state_dict)
for k, v in state_dict['state_dict'].items():
assert_allclose(v, state_dict['ema_state_dict']['module.' + k])
state_dict = torch.load(
osp.join(self.temp_dir.name, 'epoch_5.pth'), map_location='cpu')
self.assertIn('ema_state_dict', state_dict)
# Test enable ema at 5 iterations.
runner = Runner(
model=model,
train_dataloader=dict(
dataset=dict(type='DummyDataset'),
sampler=dict(type='DefaultSampler', shuffle=True),
batch_size=3,
num_workers=0),
val_dataloader=dict(
dataset=dict(type='DummyDataset'),
sampler=dict(type='DefaultSampler', shuffle=False),
batch_size=3,
num_workers=0),
val_evaluator=evaluator,
work_dir=self.temp_dir.name,
optim_wrapper=OptimWrapper(
torch.optim.Adam(ToyModel().parameters())),
train_cfg=dict(by_epoch=False, max_iters=10, val_interval=1),
val_cfg=dict(),
default_hooks=dict(
checkpoint=dict(
type='CheckpointHook', interval=1, by_epoch=False)),
custom_hooks=[dict(type='EMAHook', begin_iter=5)],
experiment_name='test7')
runner.train()
state_dict = torch.load(
osp.join(self.temp_dir.name, 'iter_4.pth'), map_location='cpu')
self.assertIn('ema_state_dict', state_dict)
for k, v in state_dict['state_dict'].items():
assert_allclose(v, state_dict['ema_state_dict']['module.' + k])
state_dict = torch.load(
osp.join(self.temp_dir.name, 'iter_5.pth'), map_location='cpu')
self.assertIn('ema_state_dict', state_dict)
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