code: def poch(z, m):
      """
      Pochhammer symbol (rising factorial) function.
  
      """
      return gamma(z + m) / gamma(z)
  
imports: from textwrap import dedent
  import numpy
  import scipy
  from pytensor.graph.basic import Apply
  from pytensor.graph.replace import _vectorize_node
  from pytensor.link.c.op import COp
  from pytensor.tensor.basic import as_tensor_variable
  from pytensor.tensor.elemwise import get_normalized_batch_axes
  from pytensor.tensor.math import gamma, gammaln, neg, sum
label_desc: Use image node_id 4 for calling a global function with example usage: poch(z, m) and returns: unknown