code: def is_aat_form(operators):
      """Returns True if operators is of the form A @ A.H, possibly recursively."""
      operators = list(operators)
      if not operators:
          raise ValueError("AAT form is undefined for empty operators")
  
      if len(operators) % 2:
          return False
  
      # Check for forms like (A1 @ A2) @ (A2.H @ A1.H)
      return all(
          is_adjoint_pair(operators[i], operators[-1 - i])
          for i in range(len(operators) // 2)
      )
  
imports: import numpy
  from tensorflow.python.framework import dtypes
  from tensorflow.python.framework import ops
  from tensorflow.python.framework import tensor_conversion
  from tensorflow.python.module import module
  from tensorflow.python.ops import array_ops
  from tensorflow.python.ops import check_ops
  from tensorflow.python.ops import control_flow_ops
  from tensorflow.python.ops import linalg_ops
  from tensorflow.python.ops import math_ops
  from tensorflow.python.ops import variables
  from tensorflow.python.util import nest
label_desc: Use image node_id 16 for calling a global function with example usage: is_aat_form(operators) and returns: all, False