code: def require_pkg(
      pkg_name: str,
      version: str = "",
      version_checker: Callable[..., bool] = min_version,
      raise_error: bool = True,
  ) -> Callable:
      """
      Decorator function to check the required package installation.
  
      Args:
          pkg_name: required package name, like: "itk", "nibabel", etc.
          version: required version string used by the version_checker.
          version_checker: a callable to check the module version, defaults to `monai.utils.min_version`.
          raise_error: if True, raise `OptionalImportError` error if the required package is not installed
              or the version doesn't match requirement, if False, print the error in a warning.
  
      """
  
      def _decorator(obj):
          is_func = isinstance(obj, FunctionType)
          call_obj = obj if is_func else obj.__init__
  
          @wraps(call_obj)
          def _wrapper(*args, **kwargs):
              _, has = optional_import(
                  module=pkg_name,
                  version=version,
                  version_checker=version_checker,
              )
              if not has:
                  err_msg = f"required package `{pkg_name}` is not installed or the version doesn't match requirement."
                  if raise_error:
                      raise OptionalImportError(err_msg)
                  else:
                      warnings.warn(err_msg)
  
              return call_obj(*args, **kwargs)
  
          if is_func:
              return _wrapper
          obj.__init__ = _wrapper
          return obj
  
      return _decorator
  
imports: from __future__ import annotations
  import enum
  import functools
  import os
  import pdb
  import re
  import sys
  import warnings
  from collections.abc import Callable, Collection, Hashable, Mapping
  from functools import partial, wraps
  from importlib import import_module
  from pkgutil import walk_packages
  from pydoc import locate
  from re import match
  from types import FunctionType, ModuleType
  from typing import Any, Iterable, cast
  import torch
label_desc: Use image node_id 10 for calling a global function with example usage: require_pkg(pkg_name, version, version_checker, raise_error) and returns: _decorator, obj, call_obj, _wrapper