code: def _is_keras_symbolic_tensor(x):
      return (
          hasattr(x, "graph")
          and getattr(x.graph, "name", None) == "keras_graph"
      )
  
imports: from google.protobuf import text_format
  from tensorflow.core.framework import tensor_pb2
  from tensorflow.python import pywrap_tfe
  from tensorflow.python.eager import core
  from tensorflow.python.framework import dtypes
  from tensorflow.python.framework import tensor_conversion_registry
  from tensorflow.python.framework import tensor_shape
  from tensorflow.python.types import core
  from tensorflow.python.util import compat
label_desc: Use image node_id 16 for calling a global function with example usage: _is_keras_symbolic_tensor(x) and returns: unknown