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# Code copied from https://github.com/tensorflow/tensorflow/blob/master/tensorflow/python/util/lazy_loader.py
import importlib
import time
import types
import textattack
from .install import logger
class LazyLoader(types.ModuleType):
"""Lazily import a module, mainly to avoid pulling in large dependencies.
This allows them to only be loaded when they are used.
"""
def __init__(self, local_name, parent_module_globals, name):
self._local_name = local_name
self._parent_module_globals = parent_module_globals
super(LazyLoader, self).__init__(name)
def _load(self):
"""Load the module and insert it into the parent's globals."""
# Import the target module and insert it into the parent's namespace
try:
module = importlib.import_module(self.__name__)
except ModuleNotFoundError as e:
raise ModuleNotFoundError(
f"Lazy module loader cannot find module named `{self.__name__}`. "
f"This might be because TextAttack does not automatically install some optional dependencies. "
f"Please run `pip install {self.__name__}` to install the package."
) from e
self._parent_module_globals[self._local_name] = module
# Update this object's dict so that if someone keeps a reference to the
# LazyLoader, lookups are efficient (__getattr__ is only called on lookups
# that fail).
self.__dict__.update(module.__dict__)
return module
def __getattr__(self, item):
module = self._load()
return getattr(module, item)
def __dir__(self):
module = self._load()
return dir(module)
def load_module_from_file(file_path):
"""Uses ``importlib`` to dynamically open a file and load an object from
it."""
temp_module_name = f"temp_{time.time()}"
colored_file_path = textattack.shared.utils.color_text(
file_path, color="blue", method="ansi"
)
logger.info(f"Loading module from `{colored_file_path}`.")
spec = importlib.util.spec_from_file_location(temp_module_name, file_path)
module = importlib.util.module_from_spec(spec)
spec.loader.exec_module(module)
return module
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