code: def _checkdep_usetex() -> bool:
      if not shutil.which("tex"):
          _log.warning("usetex mode requires TeX.")
          return False
      try:
          _get_executable_info("dvipng")
      except ExecutableNotFoundError:
          _log.warning("usetex mode requires dvipng.")
          return False
      try:
          _get_executable_info("gs")
      except ExecutableNotFoundError:
          _log.warning("usetex mode requires ghostscript.")
          return False
      return True
  
imports: import logging
  import shutil
  import pytest
  import matplotlib.testing
  import matplotlib.testing.compare
  from matplotlib import _get_executable_info, ExecutableNotFoundError
label_desc: Use image node_id 1 for calling a global function with example usage: _checkdep_usetex() and returns: True, False, False, False