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| # Copyright (c) Facebook, Inc. and its affiliates. | |
| import ast | |
| import builtins | |
| import importlib | |
| import inspect | |
| import logging | |
| import os | |
| import uuid | |
| from collections import abc | |
| from contextlib import contextmanager | |
| from copy import deepcopy | |
| from typing import List, Tuple, Union | |
| import cloudpickle | |
| import yaml | |
| from omegaconf import DictConfig, ListConfig, OmegaConf | |
| from detectron2.utils.file_io import PathManager | |
| from detectron2.utils.registry import _convert_target_to_string | |
| __all__ = ["LazyCall", "LazyConfig"] | |
| class LazyCall: | |
| """ | |
| Wrap a callable so that when it's called, the call will not be executed, | |
| but returns a dict that describes the call. | |
| LazyCall object has to be called with only keyword arguments. Positional | |
| arguments are not yet supported. | |
| Examples: | |
| :: | |
| from detectron2.config import instantiate, LazyCall | |
| layer_cfg = LazyCall(nn.Conv2d)(in_channels=32, out_channels=32) | |
| layer_cfg.out_channels = 64 # can edit it afterwards | |
| layer = instantiate(layer_cfg) | |
| """ | |
| def __init__(self, target): | |
| if not (callable(target) or isinstance(target, (str, abc.Mapping))): | |
| raise TypeError( | |
| "target of LazyCall must be a callable or defines a callable! Got {target}" | |
| ) | |
| self._target = target | |
| def __call__(self, **kwargs): | |
| kwargs["_target_"] = self._target | |
| return DictConfig(content=kwargs, flags={"allow_objects": True}) | |
| def _visit_dict_config(cfg, func): | |
| """ | |
| Apply func recursively to all DictConfig in cfg. | |
| """ | |
| if isinstance(cfg, DictConfig): | |
| func(cfg) | |
| for v in cfg.values(): | |
| _visit_dict_config(v, func) | |
| elif isinstance(cfg, ListConfig): | |
| for v in cfg: | |
| _visit_dict_config(v, func) | |
| def _validate_py_syntax(filename): | |
| # see also https://github.com/open-mmlab/mmcv/blob/master/mmcv/utils/config.py | |
| with PathManager.open(filename, "r") as f: | |
| content = f.read() | |
| try: | |
| ast.parse(content) | |
| except SyntaxError as e: | |
| raise SyntaxError(f"Config file {filename} has syntax error!") from e | |
| def _cast_to_config(obj): | |
| # if given a dict, return DictConfig instead | |
| if isinstance(obj, dict): | |
| return DictConfig(obj, flags={"allow_objects": True}) | |
| return obj | |
| _CFG_PACKAGE_NAME = "detectron2._cfg_loader" | |
| """ | |
| A namespace to put all imported config into. | |
| """ | |
| def _random_package_name(filename): | |
| # generate a random package name when loading config files | |
| return _CFG_PACKAGE_NAME + str(uuid.uuid4())[:4] + "." + os.path.basename(filename) | |
| def _patch_import(): | |
| """ | |
| Enhance relative import statements in config files, so that they: | |
| 1. locate files purely based on relative location, regardless of packages. | |
| e.g. you can import file without having __init__ | |
| 2. do not cache modules globally; modifications of module states has no side effect | |
| 3. support other storage system through PathManager | |
| 4. imported dict are turned into omegaconf.DictConfig automatically | |
| """ | |
| old_import = builtins.__import__ | |
| def find_relative_file(original_file, relative_import_path, level): | |
| cur_file = os.path.dirname(original_file) | |
| for _ in range(level - 1): | |
| cur_file = os.path.dirname(cur_file) | |
| cur_name = relative_import_path.lstrip(".") | |
| for part in cur_name.split("."): | |
| cur_file = os.path.join(cur_file, part) | |
| # NOTE: directory import is not handled. Because then it's unclear | |
| # if such import should produce python module or DictConfig. This can | |
| # be discussed further if needed. | |
| if not cur_file.endswith(".py"): | |
| cur_file += ".py" | |
| if not PathManager.isfile(cur_file): | |
| raise ImportError( | |
| f"Cannot import name {relative_import_path} from " | |
| f"{original_file}: {cur_file} has to exist." | |
| ) | |
| return cur_file | |
| def new_import(name, globals=None, locals=None, fromlist=(), level=0): | |
| if ( | |
| # Only deal with relative imports inside config files | |
| level != 0 | |
| and globals is not None | |
| and (globals.get("__package__", "") or "").startswith(_CFG_PACKAGE_NAME) | |
| ): | |
| cur_file = find_relative_file(globals["__file__"], name, level) | |
| _validate_py_syntax(cur_file) | |
| spec = importlib.machinery.ModuleSpec( | |
| _random_package_name(cur_file), None, origin=cur_file | |
| ) | |
| module = importlib.util.module_from_spec(spec) | |
| module.__file__ = cur_file | |
| with PathManager.open(cur_file) as f: | |
| content = f.read() | |
| exec(compile(content, cur_file, "exec"), module.__dict__) | |
| for name in fromlist: # turn imported dict into DictConfig automatically | |
| val = _cast_to_config(module.__dict__[name]) | |
| module.__dict__[name] = val | |
| return module | |
| return old_import(name, globals, locals, fromlist=fromlist, level=level) | |
| builtins.__import__ = new_import | |
| yield new_import | |
| builtins.__import__ = old_import | |
| class LazyConfig: | |
| """ | |
| Provid methods to save, load, and overrides an omegaconf config object | |
| which may contain definition of lazily-constructed objects. | |
| """ | |
| def load_rel(filename: str, keys: Union[None, str, Tuple[str, ...]] = None): | |
| """ | |
| Similar to :meth:`load()`, but load path relative to the caller's | |
| source file. | |
| This has the same functionality as a relative import, except that this method | |
| accepts filename as a string, so more characters are allowed in the filename. | |
| """ | |
| caller_frame = inspect.stack()[1] | |
| caller_fname = caller_frame[0].f_code.co_filename | |
| assert caller_fname != "<string>", "load_rel Unable to find caller" | |
| caller_dir = os.path.dirname(caller_fname) | |
| filename = os.path.join(caller_dir, filename) | |
| return LazyConfig.load(filename, keys) | |
| def load(filename: str, keys: Union[None, str, Tuple[str, ...]] = None): | |
| """ | |
| Load a config file. | |
| Args: | |
| filename: absolute path or relative path w.r.t. the current working directory | |
| keys: keys to load and return. If not given, return all keys | |
| (whose values are config objects) in a dict. | |
| """ | |
| has_keys = keys is not None | |
| filename = filename.replace("/./", "/") # redundant | |
| if os.path.splitext(filename)[1] not in [".py", ".yaml", ".yml"]: | |
| raise ValueError(f"Config file {filename} has to be a python or yaml file.") | |
| if filename.endswith(".py"): | |
| _validate_py_syntax(filename) | |
| with _patch_import(): | |
| # Record the filename | |
| module_namespace = { | |
| "__file__": filename, | |
| "__package__": _random_package_name(filename), | |
| } | |
| with PathManager.open(filename) as f: | |
| content = f.read() | |
| # Compile first with filename to: | |
| # 1. make filename appears in stacktrace | |
| # 2. make load_rel able to find its parent's (possibly remote) location | |
| exec(compile(content, filename, "exec"), module_namespace) | |
| ret = module_namespace | |
| else: | |
| with PathManager.open(filename) as f: | |
| obj = yaml.unsafe_load(f) | |
| ret = OmegaConf.create(obj, flags={"allow_objects": True}) | |
| if has_keys: | |
| if isinstance(keys, str): | |
| return _cast_to_config(ret[keys]) | |
| else: | |
| return tuple(_cast_to_config(ret[a]) for a in keys) | |
| else: | |
| if filename.endswith(".py"): | |
| # when not specified, only load those that are config objects | |
| ret = DictConfig( | |
| { | |
| name: _cast_to_config(value) | |
| for name, value in ret.items() | |
| if isinstance(value, (DictConfig, ListConfig, dict)) | |
| and not name.startswith("_") | |
| }, | |
| flags={"allow_objects": True}, | |
| ) | |
| return ret | |
| def save(cfg, filename: str): | |
| """ | |
| Args: | |
| cfg: an omegaconf config object | |
| filename: yaml file name to save the config file | |
| """ | |
| logger = logging.getLogger(__name__) | |
| try: | |
| cfg = deepcopy(cfg) | |
| except Exception: | |
| pass | |
| else: | |
| # if it's deep-copyable, then... | |
| def _replace_type_by_name(x): | |
| if "_target_" in x and callable(x._target_): | |
| try: | |
| x._target_ = _convert_target_to_string(x._target_) | |
| except AttributeError: | |
| pass | |
| # not necessary, but makes yaml looks nicer | |
| _visit_dict_config(cfg, _replace_type_by_name) | |
| try: | |
| with PathManager.open(filename, "w") as f: | |
| dict = OmegaConf.to_container(cfg, resolve=False) | |
| dumped = yaml.dump(dict, default_flow_style=None, allow_unicode=True, width=9999) | |
| f.write(dumped) | |
| except Exception: | |
| logger.exception("Unable to serialize the config to yaml. Error:") | |
| new_filename = filename + ".pkl" | |
| try: | |
| # retry by pickle | |
| with PathManager.open(new_filename, "wb") as f: | |
| cloudpickle.dump(cfg, f) | |
| logger.warning(f"Config saved using cloudpickle at {new_filename} ...") | |
| except Exception: | |
| pass | |
| def apply_overrides(cfg, overrides: List[str]): | |
| """ | |
| In-place override contents of cfg. | |
| Args: | |
| cfg: an omegaconf config object | |
| overrides: list of strings in the format of "a=b" to override configs. | |
| See https://hydra.cc/docs/next/advanced/override_grammar/basic/ | |
| for syntax. | |
| Returns: | |
| the cfg object | |
| """ | |
| def safe_update(cfg, key, value): | |
| parts = key.split(".") | |
| for idx in range(1, len(parts)): | |
| prefix = ".".join(parts[:idx]) | |
| v = OmegaConf.select(cfg, prefix, default=None) | |
| if v is None: | |
| break | |
| if not OmegaConf.is_config(v): | |
| raise KeyError( | |
| f"Trying to update key {key}, but {prefix} " | |
| f"is not a config, but has type {type(v)}." | |
| ) | |
| OmegaConf.update(cfg, key, value, merge=True) | |
| from hydra.core.override_parser.overrides_parser import OverridesParser | |
| parser = OverridesParser.create() | |
| overrides = parser.parse_overrides(overrides) | |
| for o in overrides: | |
| key = o.key_or_group | |
| value = o.value() | |
| if o.is_delete(): | |
| # TODO support this | |
| raise NotImplementedError("deletion is not yet a supported override") | |
| safe_update(cfg, key, value) | |
| return cfg | |
| def to_py(cfg, prefix: str = "cfg."): | |
| """ | |
| Convert a config object into its equivalent Python code. | |
| Args: | |
| cfg: an omegaconf config object | |
| prefix: root name for the resulting code (default: "cfg.") | |
| Returns: | |
| str of formatted Python code | |
| """ | |
| import black | |
| cfg = OmegaConf.to_container(cfg, resolve=True) | |
| def _to_str(obj, prefix=None, inside_call=False): | |
| if prefix is None: | |
| prefix = [] | |
| if isinstance(obj, abc.Mapping) and "_target_" in obj: | |
| # Dict representing a function call | |
| target = _convert_target_to_string(obj.pop("_target_")) | |
| args = [] | |
| for k, v in sorted(obj.items()): | |
| args.append(f"{k}={_to_str(v, inside_call=True)}") | |
| args = ", ".join(args) | |
| call = f"{target}({args})" | |
| return "".join(prefix) + call | |
| elif isinstance(obj, abc.Mapping) and not inside_call: | |
| # Dict that is not inside a call is a list of top-level config objects that we | |
| # render as one object per line with dot separated prefixes | |
| key_list = [] | |
| for k, v in sorted(obj.items()): | |
| if isinstance(v, abc.Mapping) and "_target_" not in v: | |
| key_list.append(_to_str(v, prefix=prefix + [k + "."])) | |
| else: | |
| key = "".join(prefix) + k | |
| key_list.append(f"{key}={_to_str(v)}") | |
| return "\n".join(key_list) | |
| elif isinstance(obj, abc.Mapping): | |
| # Dict that is inside a call is rendered as a regular dict | |
| return ( | |
| "{" | |
| + ",".join( | |
| f"{repr(k)}: {_to_str(v, inside_call=inside_call)}" | |
| for k, v in sorted(obj.items()) | |
| ) | |
| + "}" | |
| ) | |
| elif isinstance(obj, list): | |
| return "[" + ",".join(_to_str(x, inside_call=inside_call) for x in obj) + "]" | |
| else: | |
| return repr(obj) | |
| py_str = _to_str(cfg, prefix=[prefix]) | |
| try: | |
| return black.format_str(py_str, mode=black.Mode()) | |
| except black.InvalidInput: | |
| return py_str | |