[Refactor] Refactor the import rule (#459)

* [Refactor] Refactor the import rule

* minor refinement

* add a comment

mmengine/evaluator/evaluator.py

@@ -2,7 +2,7 @@
 from typing import Iterator, List, Optional, Sequence, Union
 
 from mmengine.data import BaseDataElement
-from ..registry.root import EVALUATOR, METRICS
+from mmengine.registry import EVALUATOR, METRICS
 from .metric import BaseMetric
 
 

mmengine/fileio/file_client.py

@@ -10,8 +10,7 @@ from pathlib import Path
 from typing import Any, Generator, Iterator, Optional, Tuple, Union
 from urllib.request import urlopen
 
-import mmengine
-from mmengine.utils import has_method, is_filepath
+from mmengine.utils import has_method, is_filepath, mkdir_or_exist
 
 
 class BaseStorageBackend(metaclass=ABCMeta):
@@ -523,7 +522,7 @@ class HardDiskBackend(BaseStorageBackend):
             obj (bytes): Data to be written.
             filepath (str or Path): Path to write data.
         """
-        mmengine.mkdir_or_exist(osp.dirname(filepath))
+        mkdir_or_exist(osp.dirname(filepath))
         with open(filepath, 'wb') as f:
             f.write(obj)
 
@@ -543,7 +542,7 @@ class HardDiskBackend(BaseStorageBackend):
             encoding (str): The encoding format used to open the ``filepath``.
                 Default: 'utf-8'.
         """
-        mmengine.mkdir_or_exist(osp.dirname(filepath))
+        mkdir_or_exist(osp.dirname(filepath))
         with open(filepath, 'w', encoding=encoding) as f:
             f.write(obj)
 

mmengine/fileio/io.py

@@ -2,7 +2,7 @@
 from io import BytesIO, StringIO
 from pathlib import Path
 
-from ..utils import is_list_of, is_str
+from mmengine.utils import is_list_of, is_str
 from .file_client import FileClient
 from .handlers import BaseFileHandler, JsonHandler, PickleHandler, YamlHandler
 

mmengine/hooks/checkpoint_hook.py

@@ -9,8 +9,7 @@ from typing import Callable, Dict, List, Optional, Sequence, Union
 from mmengine.dist import master_only
 from mmengine.fileio import FileClient
 from mmengine.registry import HOOKS
-from mmengine.utils import is_seq_of
-from mmengine.utils.misc import is_list_of
+from mmengine.utils import is_list_of, is_seq_of
 from .hook import Hook
 
 DATA_BATCH = Optional[Sequence[dict]]

mmengine/hooks/runtime_info_hook.py

@@ -1,9 +1,9 @@
 # Copyright (c) OpenMMLab. All rights reserved.
 from typing import Dict, Optional, Sequence
 
-from ..registry import HOOKS
-from ..utils import get_git_hash
-from ..version import __version__
+from mmengine.registry import HOOKS
+from mmengine.utils import get_git_hash
+from mmengine.version import __version__
 from .hook import Hook
 
 DATA_BATCH = Optional[Sequence[dict]]

mmengine/hooks/sync_buffer_hook.py

@@ -1,5 +1,5 @@
 # Copyright (c) OpenMMLab. All rights reserved.
-from mmengine import dist
+from mmengine.dist import all_reduce_params, is_distributed
 from mmengine.registry import HOOKS
 from .hook import Hook
 
@@ -12,7 +12,7 @@ class SyncBuffersHook(Hook):
     priority = 'NORMAL'
 
     def __init__(self) -> None:
-        self.distributed = dist.is_distributed()
+        self.distributed = is_distributed()
 
     def after_train_epoch(self, runner) -> None:
         """All-reduce model buffers at the end of each epoch.
@@ -21,4 +21,4 @@ class SyncBuffersHook(Hook):
             runner (Runner): The runner of the training process.
         """
         if self.distributed:
-            dist.all_reduce_params(runner.model.buffers(), op='mean')
+            all_reduce_params(runner.model.buffers(), op='mean')

mmengine/logging/log_processor.py

@@ -4,9 +4,7 @@ import datetime
 from collections import OrderedDict
 from typing import List, Optional, Tuple
 
-import torch
-
-from mmengine.device import get_max_cuda_memory
+from mmengine.device import get_max_cuda_memory, is_cuda_available
 from mmengine.registry import LOG_PROCESSORS
 
 
@@ -173,7 +171,7 @@ class LogProcessor:
             log_tag.pop('data_time')
 
         # If cuda is available, the max memory occupied should be calculated.
-        if torch.cuda.is_available():
+        if is_cuda_available():
             log_str += f'memory: {self._get_max_memory(runner)}  '
         # Loop left keys to fill `log_str`.
         if mode in ('train', 'val'):

mmengine/logging/logger.py

@@ -7,7 +7,7 @@ from typing import Optional, Union
 
 from termcolor import colored
 
-from mmengine import dist
+from mmengine.dist import get_rank
 from mmengine.utils import ManagerMixin
 from mmengine.utils.manager import _accquire_lock, _release_lock
 
@@ -152,7 +152,7 @@ class MMLogger(Logger, ManagerMixin):
         Logger.__init__(self, logger_name)
         ManagerMixin.__init__(self, name)
         # Get rank in DDP mode.
-        rank = dist.get_rank()
+        rank = get_rank()
 
         # Config stream_handler. If `rank != 0`. stream_handler can only
         # export ERROR logs.

mmengine/model/wrappers/seperate_distributed.py

@@ -7,7 +7,7 @@ import torch.nn as nn
 from torch.nn.parallel.distributed import DistributedDataParallel
 
 from mmengine.data import BaseDataElement
-from mmengine.device.utils import get_device
+from mmengine.device import get_device
 from mmengine.optim import OptimWrapperDict
 from mmengine.registry import MODEL_WRAPPERS
 from .distributed import MMDistributedDataParallel

mmengine/runner/amp.py

@@ -5,9 +5,9 @@ from typing import Optional
 
 import torch
 
-from ..device import get_device
-from ..logging import print_log
-from ..utils import TORCH_VERSION, digit_version
+from mmengine.device import get_device
+from mmengine.logging import print_log
+from mmengine.utils import TORCH_VERSION, digit_version
 
 
 @contextmanager

mmengine/runner/runner.py

@@ -33,10 +33,10 @@ from mmengine.model import (BaseModel, MMDistributedDataParallel,
 from mmengine.optim import (OptimWrapper, OptimWrapperDict, _ParamScheduler,
                             build_optim_wrapper)
 from mmengine.registry import (DATA_SAMPLERS, DATASETS, EVALUATOR, HOOKS,
-                               LOOPS, MODEL_WRAPPERS, MODELS, OPTIM_WRAPPERS,
-                               PARAM_SCHEDULERS, RUNNERS, VISUALIZERS,
-                               DefaultScope, count_registered_modules)
-from mmengine.registry.root import LOG_PROCESSORS
+                               LOG_PROCESSORS, LOOPS, MODEL_WRAPPERS, MODELS,
+                               OPTIM_WRAPPERS, PARAM_SCHEDULERS, RUNNERS,
+                               VISUALIZERS, DefaultScope,
+                               count_registered_modules)
 from mmengine.utils import (TORCH_VERSION, collect_env, digit_version,
                             get_git_hash, is_seq_of, revert_sync_batchnorm,
                             set_multi_processing)

mmengine/runner/utils.py

@@ -1,7 +1,7 @@
 # Copyright (c) OpenMMLab. All rights reserved.
 from typing import List, Optional, Tuple
 
-from mmengine.utils.misc import is_list_of
+from mmengine.utils import is_list_of
 
 
 def calc_dynamic_intervals(

tests/test_logging/test_logger.py

@@ -8,14 +8,16 @@ from unittest.mock import patch
 
 import pytest
 
-from mmengine import MMLogger, print_log
+from mmengine.logging import MMLogger, print_log
 
 
 class TestLogger:
     stream_handler_regex_time = r'\d{2}/\d{2} \d{2}:\d{2}:\d{2}'
     file_handler_regex_time = r'\d{4}/\d{2}/\d{2} \d{2}:\d{2}:\d{2}'
 
-    @patch('mmengine.dist.get_rank', lambda: 0)
+    # Since `get_rank` has been imported in logger.py, it needs to mock
+    # `logger.get_rank`
+    @patch('mmengine.logging.logger.get_rank', lambda: 0)
     def test_init_rank0(self, tmp_path):
         logger = MMLogger.get_instance('rank0.pkg1', log_level='INFO')
         assert logger.name == 'mmengine'
@@ -45,7 +47,7 @@ class TestLogger:
         assert logger.instance_name == 'rank0.pkg3'
         logging.shutdown()
 
-    @patch('mmengine.dist.get_rank', lambda: 1)
+    @patch('mmengine.logging.logger.get_rank', lambda: 1)
     def test_init_rank1(self, tmp_path):
         # If `rank!=1`, the `loglevel` of file_handler is `logging.ERROR`.
         tmp_file = tmp_path / 'tmp_file.log'

tests/test_logging/test_message_hub.py

@@ -6,7 +6,7 @@ import numpy as np
 import pytest
 import torch
 
-from mmengine import HistoryBuffer, MessageHub
+from mmengine.logging import HistoryBuffer, MessageHub
 
 
 class NoDeepCopy:

tests/test_optim/test_optimizer/test_optimizer_wrapper.py

@@ -11,8 +11,8 @@ from torch.cuda.amp import GradScaler
 from torch.nn.parallel.distributed import DistributedDataParallel
 from torch.optim import SGD, Adam, Optimizer
 
-from mmengine import MessageHub, MMLogger
 from mmengine.dist import all_gather
+from mmengine.logging import MessageHub, MMLogger
 from mmengine.optim import AmpOptimWrapper, OptimWrapper
 from mmengine.testing import assert_allclose
 from mmengine.testing._internal import MultiProcessTestCase