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Source code for mmengine.registry.registry

# Copyright (c) OpenMMLab. All rights reserved.
import inspect
import logging
import sys
from collections.abc import Callable
from contextlib import contextmanager
from importlib import import_module
from typing import Any, Dict, Generator, List, Optional, Tuple, Type, Union

from rich.console import Console
from rich.table import Table

from mmengine.config.utils import MODULE2PACKAGE
from mmengine.utils import get_object_from_string, is_seq_of
from .default_scope import DefaultScope


[docs]class Registry: """A registry to map strings to classes or functions. Registered object could be built from registry. Meanwhile, registered functions could be called from registry. Args: name (str): Registry name. build_func (callable, optional): A function to construct instance from Registry. :func:`build_from_cfg` is used if neither ``parent`` or ``build_func`` is specified. If ``parent`` is specified and ``build_func`` is not given, ``build_func`` will be inherited from ``parent``. Defaults to None. parent (:obj:`Registry`, optional): Parent registry. The class registered in children registry could be built from parent. Defaults to None. scope (str, optional): The scope of registry. It is the key to search for children registry. If not specified, scope will be the name of the package where class is defined, e.g. mmdet, mmcls, mmseg. Defaults to None. locations (list): The locations to import the modules registered in this registry. Defaults to []. New in version 0.4.0. Examples: >>> # define a registry >>> MODELS = Registry('models') >>> # registry the `ResNet` to `MODELS` >>> @MODELS.register_module() >>> class ResNet: >>> pass >>> # build model from `MODELS` >>> resnet = MODELS.build(dict(type='ResNet')) >>> @MODELS.register_module() >>> def resnet50(): >>> pass >>> resnet = MODELS.build(dict(type='resnet50')) >>> # hierarchical registry >>> DETECTORS = Registry('detectors', parent=MODELS, scope='det') >>> @DETECTORS.register_module() >>> class FasterRCNN: >>> pass >>> fasterrcnn = DETECTORS.build(dict(type='FasterRCNN')) >>> # add locations to enable auto import >>> DETECTORS = Registry('detectors', parent=MODELS, >>> scope='det', locations=['det.models.detectors']) >>> # define this class in 'det.models.detectors' >>> @DETECTORS.register_module() >>> class MaskRCNN: >>> pass >>> # The registry will auto import det.models.detectors.MaskRCNN >>> fasterrcnn = DETECTORS.build(dict(type='det.MaskRCNN')) More advanced usages can be found at https://mmengine.readthedocs.io/en/latest/advanced_tutorials/registry.html. """ def __init__(self, name: str, build_func: Optional[Callable] = None, parent: Optional['Registry'] = None, scope: Optional[str] = None, locations: List = []): from .build_functions import build_from_cfg self._name = name self._module_dict: Dict[str, Type] = dict() self._children: Dict[str, 'Registry'] = dict() self._locations = locations self._imported = False if scope is not None: assert isinstance(scope, str) self._scope = scope else: self._scope = self.infer_scope() # See https://mypy.readthedocs.io/en/stable/common_issues.html# # variables-vs-type-aliases for the use self.parent: Optional['Registry'] if parent is not None: assert isinstance(parent, Registry) parent._add_child(self) self.parent = parent else: self.parent = None # self.build_func will be set with the following priority: # 1. build_func # 2. parent.build_func # 3. build_from_cfg self.build_func: Callable if build_func is None: if self.parent is not None: self.build_func = self.parent.build_func else: self.build_func = build_from_cfg else: self.build_func = build_func def __len__(self): return len(self._module_dict) def __contains__(self, key): return self.get(key) is not None def __repr__(self): table = Table(title=f'Registry of {self._name}') table.add_column('Names', justify='left', style='cyan') table.add_column('Objects', justify='left', style='green') for name, obj in sorted(self._module_dict.items()): table.add_row(name, str(obj)) console = Console() with console.capture() as capture: console.print(table, end='') return capture.get()
[docs] @staticmethod def infer_scope() -> str: """Infer the scope of registry. The name of the package where registry is defined will be returned. Returns: str: The inferred scope name. Examples: >>> # in mmdet/models/backbone/resnet.py >>> MODELS = Registry('models') >>> @MODELS.register_module() >>> class ResNet: >>> pass >>> # The scope of ``ResNet`` will be ``mmdet``. """ from ..logging import print_log # `sys._getframe` returns the frame object that many calls below the # top of the stack. The call stack for `infer_scope` can be listed as # follow: # frame-0: `infer_scope` itself # frame-1: `__init__` of `Registry` which calls the `infer_scope` # frame-2: Where the `Registry(...)` is called module = inspect.getmodule(sys._getframe(2)) if module is not None: filename = module.__name__ split_filename = filename.split('.') scope = split_filename[0] else: # use "mmengine" to handle some cases which can not infer the scope # like initializing Registry in interactive mode scope = 'mmengine' print_log( 'set scope as "mmengine" when scope can not be inferred. You ' 'can silence this warning by passing a "scope" argument to ' 'Registry like `Registry(name, scope="toy")`', logger='current', level=logging.WARNING) return scope
[docs] @staticmethod def split_scope_key(key: str) -> Tuple[Optional[str], str]: """Split scope and key. The first scope will be split from key. Return: tuple[str | None, str]: The former element is the first scope of the key, which can be ``None``. The latter is the remaining key. Examples: >>> Registry.split_scope_key('mmdet.ResNet') 'mmdet', 'ResNet' >>> Registry.split_scope_key('ResNet') None, 'ResNet' """ split_index = key.find('.') if split_index != -1: return key[:split_index], key[split_index + 1:] else: return None, key
@property def name(self): return self._name @property def scope(self): return self._scope @property def module_dict(self): return self._module_dict @property def children(self): return self._children @property def root(self): return self._get_root_registry()
[docs] @contextmanager def switch_scope_and_registry(self, scope: Optional[str]) -> Generator: """Temporarily switch default scope to the target scope, and get the corresponding registry. If the registry of the corresponding scope exists, yield the registry, otherwise yield the current itself. Args: scope (str, optional): The target scope. Examples: >>> from mmengine.registry import Registry, DefaultScope, MODELS >>> import time >>> # External Registry >>> MMDET_MODELS = Registry('mmdet_model', scope='mmdet', >>> parent=MODELS) >>> MMCLS_MODELS = Registry('mmcls_model', scope='mmcls', >>> parent=MODELS) >>> # Local Registry >>> CUSTOM_MODELS = Registry('custom_model', scope='custom', >>> parent=MODELS) >>> >>> # Initiate DefaultScope >>> DefaultScope.get_instance(f'scope_{time.time()}', >>> scope_name='custom') >>> # Check default scope >>> DefaultScope.get_current_instance().scope_name custom >>> # Switch to mmcls scope and get `MMCLS_MODELS` registry. >>> with CUSTOM_MODELS.switch_scope_and_registry(scope='mmcls') as registry: >>> DefaultScope.get_current_instance().scope_name mmcls >>> registry.scope mmcls >>> # Nested switch scope >>> with CUSTOM_MODELS.switch_scope_and_registry(scope='mmdet') as mmdet_registry: >>> DefaultScope.get_current_instance().scope_name mmdet >>> mmdet_registry.scope mmdet >>> with CUSTOM_MODELS.switch_scope_and_registry(scope='mmcls') as mmcls_registry: >>> DefaultScope.get_current_instance().scope_name mmcls >>> mmcls_registry.scope mmcls >>> >>> # Check switch back to original scope. >>> DefaultScope.get_current_instance().scope_name custom """ # noqa: E501 from ..logging import print_log # Switch to the given scope temporarily. If the corresponding registry # can be found in root registry, return the registry under the scope, # otherwise return the registry itself. with DefaultScope.overwrite_default_scope(scope): # Get the global default scope default_scope = DefaultScope.get_current_instance() # Get registry by scope if default_scope is not None: scope_name = default_scope.scope_name try: import_module(f'{scope_name}.registry') except (ImportError, AttributeError, ModuleNotFoundError): if scope in MODULE2PACKAGE: print_log( f'{scope} is not installed and its ' 'modules will not be registered. If you ' 'want to use modules defined in ' f'{scope}, Please install {scope} by ' f'`pip install {MODULE2PACKAGE[scope]}.', logger='current', level=logging.WARNING) else: print_log( f'Failed to import `{scope}.registry` ' f'make sure the registry.py exists in `{scope}` ' 'package.', logger='current', level=logging.WARNING) root = self._get_root_registry() registry = root._search_child(scope_name) if registry is None: # if `default_scope` can not be found, fallback to argument # `registry` print_log( f'Failed to search registry with scope "{scope_name}" ' f'in the "{root.name}" registry tree. ' f'As a workaround, the current "{self.name}" registry ' f'in "{self.scope}" is used to build instance. This ' 'may cause unexpected failure when running the built ' f'modules. Please check whether "{scope_name}" is a ' 'correct scope, or whether the registry is ' 'initialized.', logger='current', level=logging.WARNING) registry = self # If there is no built default scope, just return current registry. else: registry = self yield registry
def _get_root_registry(self) -> 'Registry': """Return the root registry.""" root = self while root.parent is not None: root = root.parent return root
[docs] def import_from_location(self) -> None: """import modules from the pre-defined locations in self._location.""" if not self._imported: # Avoid circular import from ..logging import print_log # avoid BC breaking if len(self._locations) == 0 and self.scope in MODULE2PACKAGE: print_log( f'The "{self.name}" registry in {self.scope} did not ' 'set import location. Fallback to call ' f'`{self.scope}.utils.register_all_modules` ' 'instead.', logger='current', level=logging.DEBUG) try: module = import_module(f'{self.scope}.utils') except (ImportError, AttributeError, ModuleNotFoundError): if self.scope in MODULE2PACKAGE: print_log( f'{self.scope} is not installed and its ' 'modules will not be registered. If you ' 'want to use modules defined in ' f'{self.scope}, Please install {self.scope} by ' f'`pip install {MODULE2PACKAGE[self.scope]}.', logger='current', level=logging.WARNING) else: print_log( f'Failed to import {self.scope} and register ' 'its modules, please make sure you ' 'have registered the module manually.', logger='current', level=logging.WARNING) else: # The import errors triggered during the registration # may be more complex, here just throwing # the error to avoid causing more implicit registry errors # like `xxx`` not found in `yyy` registry. module.register_all_modules(False) # type: ignore for loc in self._locations: import_module(loc) print_log( f"Modules of {self.scope}'s {self.name} registry have " f'been automatically imported from {loc}', logger='current', level=logging.DEBUG) self._imported = True
[docs] def get(self, key: str) -> Optional[Type]: """Get the registry record. If `key`` represents the whole object name with its module information, for example, `mmengine.model.BaseModel`, ``get`` will directly return the class object :class:`BaseModel`. Otherwise, it will first parse ``key`` and check whether it contains a scope name. The logic to search for ``key``: - ``key`` does not contain a scope name, i.e., it is purely a module name like "ResNet": :meth:`get` will search for ``ResNet`` from the current registry to its parent or ancestors until finding it. - ``key`` contains a scope name and it is equal to the scope of the current registry (e.g., "mmcls"), e.g., "mmcls.ResNet": :meth:`get` will only search for ``ResNet`` in the current registry. - ``key`` contains a scope name and it is not equal to the scope of the current registry (e.g., "mmdet"), e.g., "mmcls.FCNet": If the scope exists in its children, :meth:`get` will get "FCNet" from them. If not, :meth:`get` will first get the root registry and root registry call its own :meth:`get` method. Args: key (str): Name of the registered item, e.g., the class name in string format. Returns: Type or None: Return the corresponding class if ``key`` exists, otherwise return None. Examples: >>> # define a registry >>> MODELS = Registry('models') >>> # register `ResNet` to `MODELS` >>> @MODELS.register_module() >>> class ResNet: >>> pass >>> resnet_cls = MODELS.get('ResNet') >>> # hierarchical registry >>> DETECTORS = Registry('detector', parent=MODELS, scope='det') >>> # `ResNet` does not exist in `DETECTORS` but `get` method >>> # will try to search from its parents or ancestors >>> resnet_cls = DETECTORS.get('ResNet') >>> CLASSIFIER = Registry('classifier', parent=MODELS, scope='cls') >>> @CLASSIFIER.register_module() >>> class MobileNet: >>> pass >>> # `get` from its sibling registries >>> mobilenet_cls = DETECTORS.get('cls.MobileNet') """ # Avoid circular import from ..logging import print_log if not isinstance(key, str): raise TypeError( 'The key argument of `Registry.get` must be a str, ' f'got {type(key)}') scope, real_key = self.split_scope_key(key) obj_cls = None registry_name = self.name scope_name = self.scope # lazy import the modules to register them into the registry self.import_from_location() if scope is None or scope == self._scope: # get from self if real_key in self._module_dict: obj_cls = self._module_dict[real_key] elif scope is None: # try to get the target from its parent or ancestors parent = self.parent while parent is not None: if real_key in parent._module_dict: obj_cls = parent._module_dict[real_key] registry_name = parent.name scope_name = parent.scope break parent = parent.parent else: # import the registry to add the nodes into the registry tree try: import_module(f'{scope}.registry') print_log( f'Registry node of {scope} has been automatically ' 'imported.', logger='current', level=logging.DEBUG) except (ImportError, AttributeError, ModuleNotFoundError): print_log( f'Cannot auto import {scope}.registry, please check ' f'whether the package "{scope}" is installed correctly ' 'or import the registry manually.', logger='current', level=logging.DEBUG) # get from self._children if scope in self._children: obj_cls = self._children[scope].get(real_key) registry_name = self._children[scope].name scope_name = scope else: root = self._get_root_registry() if scope != root._scope and scope not in root._children: # If not skip directly, `root.get(key)` will recursively # call itself until RecursionError is thrown. pass else: obj_cls = root.get(key) if obj_cls is None: # Actually, it's strange to implement this `try ... except` to # get the object by its name in `Registry.get`. However, If we # want to build the model using a configuration like # `dict(type='mmengine.model.BaseModel')`, which can # be dumped by lazy import config, we need this code snippet # for `Registry.get` to work. try: obj_cls = get_object_from_string(key) except Exception: raise RuntimeError(f'Failed to get {key}') if obj_cls is not None: # For some rare cases (e.g. obj_cls is a partial function), obj_cls # doesn't have `__name__`. Use default value to prevent error cls_name = getattr(obj_cls, '__name__', str(obj_cls)) print_log( f'Get class `{cls_name}` from "{registry_name}"' f' registry in "{scope_name}"', logger='current', level=logging.DEBUG) return obj_cls
def _search_child(self, scope: str) -> Optional['Registry']: """Depth-first search for the corresponding registry in its children. Note that the method only search for the corresponding registry from the current registry. Therefore, if we want to search from the root registry, :meth:`_get_root_registry` should be called to get the root registry first. Args: scope (str): The scope name used for searching for its corresponding registry. Returns: Registry or None: Return the corresponding registry if ``scope`` exists, otherwise return None. """ if self._scope == scope: return self for child in self._children.values(): registry = child._search_child(scope) if registry is not None: return registry return None
[docs] def build(self, cfg: dict, *args, **kwargs) -> Any: """Build an instance. Build an instance by calling :attr:`build_func`. Args: cfg (dict): Config dict needs to be built. Returns: Any: The constructed object. Examples: >>> from mmengine import Registry >>> MODELS = Registry('models') >>> @MODELS.register_module() >>> class ResNet: >>> def __init__(self, depth, stages=4): >>> self.depth = depth >>> self.stages = stages >>> cfg = dict(type='ResNet', depth=50) >>> model = MODELS.build(cfg) """ return self.build_func(cfg, *args, **kwargs, registry=self)
def _add_child(self, registry: 'Registry') -> None: """Add a child for a registry. Args: registry (:obj:`Registry`): The ``registry`` will be added as a child of the ``self``. """ assert isinstance(registry, Registry) assert registry.scope is not None assert registry.scope not in self.children, \ f'scope {registry.scope} exists in {self.name} registry' self.children[registry.scope] = registry def _register_module(self, module: Type, module_name: Optional[Union[str, List[str]]] = None, force: bool = False) -> None: """Register a module. Args: module (type): Module to be registered. Typically a class or a function, but generally all ``Callable`` are acceptable. module_name (str or list of str, optional): The module name to be registered. If not specified, the class name will be used. Defaults to None. force (bool): Whether to override an existing class with the same name. Defaults to False. """ if not callable(module): raise TypeError(f'module must be Callable, but got {type(module)}') if module_name is None: module_name = module.__name__ if isinstance(module_name, str): module_name = [module_name] for name in module_name: if not force and name in self._module_dict: existed_module = self.module_dict[name] raise KeyError(f'{name} is already registered in {self.name} ' f'at {existed_module.__module__}') self._module_dict[name] = module
[docs] def register_module( self, name: Optional[Union[str, List[str]]] = None, force: bool = False, module: Optional[Type] = None) -> Union[type, Callable]: """Register a module. A record will be added to ``self._module_dict``, whose key is the class name or the specified name, and value is the class itself. It can be used as a decorator or a normal function. Args: name (str or list of str, optional): The module name to be registered. If not specified, the class name will be used. force (bool): Whether to override an existing class with the same name. Defaults to False. module (type, optional): Module class or function to be registered. Defaults to None. Examples: >>> backbones = Registry('backbone') >>> # as a decorator >>> @backbones.register_module() >>> class ResNet: >>> pass >>> backbones = Registry('backbone') >>> @backbones.register_module(name='mnet') >>> class MobileNet: >>> pass >>> # as a normal function >>> class ResNet: >>> pass >>> backbones.register_module(module=ResNet) """ if not isinstance(force, bool): raise TypeError(f'force must be a boolean, but got {type(force)}') # raise the error ahead of time if not (name is None or isinstance(name, str) or is_seq_of(name, str)): raise TypeError( 'name must be None, an instance of str, or a sequence of str, ' f'but got {type(name)}') # use it as a normal method: x.register_module(module=SomeClass) if module is not None: self._register_module(module=module, module_name=name, force=force) return module # use it as a decorator: @x.register_module() def _register(module): self._register_module(module=module, module_name=name, force=force) return module return _register

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