code: def _Flatten(l):
      """Converts [1, 2, [3, 4], [5]] to [1, 2, 3, 4, 5]."""
      # [1, 2, [3, 4], [5]] -> [[1], [2], [3, 4], [5]]
      l_of_l = [x if _IsListValue(x) else [x] for x in l]
      # [[1], [2], [3, 4], [5]] -> [1, 2, 3, 4, 5]
      return [item for sublist in l_of_l for item in sublist]
  
imports: from google.protobuf import text_format
  from tensorflow.core.config import flags
  from tensorflow.core.framework import attr_value_pb2
  from tensorflow.core.framework import tensor_pb2
  from tensorflow.core.framework import tensor_shape_pb2
  from tensorflow.core.framework import types_pb2
  from tensorflow.python.framework import dtypes
  from tensorflow.python.framework import op_callbacks
  from tensorflow.python.framework import op_def_library_pybind
  from tensorflow.python.framework import op_def_registry
  from tensorflow.python.framework import ops
  from tensorflow.python.framework import tensor
  from tensorflow.python.framework import tensor_shape
  from tensorflow.python.platform import tf_logging
  from tensorflow.python.util import _pywrap_utils
  from tensorflow.python.util import compat
  from tensorflow.python.util import tf_contextlib
label_desc: Use image node_id 10 for calling a global function with example usage: _Flatten(l) and returns: unknown