code: def _tensor_array_to_flow(loop_vars):
      def f(maybe_ta):
          if isinstance(maybe_ta, tensor_array_ops.TensorArray):
              return maybe_ta.flow
          return maybe_ta
  
      return nest.map_structure(f, loop_vars, expand_composites=True)
  
imports: import collections
  from tensorflow.core.framework import attr_value_pb2
  from tensorflow.python.client import pywrap_tf_session
  from tensorflow.python.eager import backprop_util
  from tensorflow.python.framework import auto_control_deps_utils
  from tensorflow.python.framework import constant_op
  from tensorflow.python.framework import dtypes
  from tensorflow.python.framework import func_graph
  from tensorflow.python.framework import indexed_slices
  from tensorflow.python.framework import ops
  from tensorflow.python.framework import tensor
  from tensorflow.python.framework import tensor_shape
  from tensorflow.python.framework import tensor_spec
  from tensorflow.python.framework import tensor_util
  from tensorflow.python.ops import array_ops
  from tensorflow.python.ops import control_flow_ops
  from tensorflow.python.ops import control_flow_util
  from tensorflow.python.ops import control_flow_util_v2
  from tensorflow.python.ops import default_gradient
  from tensorflow.python.ops import gen_functional_ops
  from tensorflow.python.ops import gen_resource_variable_ops
  from tensorflow.python.ops import gradients_util
  from tensorflow.python.ops import handle_data_util
  from tensorflow.python.ops import list_ops
  from tensorflow.python.ops import math_ops
  from tensorflow.python.ops import tensor_array_ops
  from tensorflow.python.ops import while_v2_indexed_slices_rewriter
  from tensorflow.python.util import compat
  from tensorflow.python.util import nest
  from tensorflow.python.util import object_identity
  from tensorflow.python.util import variable_utils
label_desc: Use image node_id 21 for calling a global function with example usage: _tensor_array_to_flow(loop_vars) and returns: nest, maybe_ta, maybe_ta