code: def _to_str(s):
      return s.decode("latin1") if isinstance(s, bytes) else str(s)
  
imports: import itertools
  import warnings
  from string import ascii_letters, digits
  import numpy
  import sympy
  from scipy.linalg import pinv
  from sympy import Dummy, default_sort_key
  from sympy.utilities.lambdify import implemented_function, lambdify
  from nipy.algorithms.utils.matrices import full_rank, matrix_rank
  from nipy.utils import VisibleDeprecationWarning, _NoValue
label_desc: Use image node_id 1 for calling a global function with example usage: _to_str(s) and returns: unknown