code: def installed(*specifiers):
      """Returns True if the current environment satisfies the specified
      package requirement.
  
      Args:
          specifiers: Version specifiers (e.g., `numpy>=1.20.0`).
      """
      # Delay import of pkg_resources because it is excruciatingly slow.
      # See https://github.com/pypa/setuptools/issues/510
      import pkg_resources
  
      for spec in specifiers:
          try:
              pkg_resources.require(spec)
          except pkg_resources.ResolutionError:
              return False
      return True
  
imports: import contextlib
  import inspect
  from typing import Callable
  import unittest
  from unittest import mock
  import warnings
  import numpy
  import cupy
  from cupy._core import internal
  import cupyx
  import cupyx.scipy.sparse
  from cupy.testing._pytest_impl import is_available
label_desc: Use image node_id 2 for calling a global function with example usage: installed() and returns: True, False