code: def std_cdf(x):
      """
      Calculates the standard normal cumulative distribution function.
      """
      return 0.5 + 0.5 * pt.erf(x / pt.sqrt(2.0))
  
imports: import warnings
  from functools import partial
  from typing import Iterable
  import numpy
  import pytensor
  import pytensor.tensor
  import scipy.linalg
  import scipy.stats
  from pytensor.graph.basic import Apply, Variable
  from pytensor.graph.op import Op
  from pytensor.scalar import UnaryScalarOp, upgrade_to_float_no_complex
  from pytensor.tensor import gammaln
  from pytensor.tensor.elemwise import Elemwise
  from pymc.distributions.shape_utils import to_tuple
  from pymc.logprob.utils import CheckParameterValue
  from pymc.pytensorf import floatX
label_desc: Use image node_id 7 for calling a global function with example usage: std_cdf(x) and returns: unknown