code: def foo(self):
      return self.a + 1
  
file_path: tensorflow-upstream/tensorflow/python/autograph/tests/call_to_named_tuple_test.py
imports: import collections
  import tensorflow.compat.v1
  from tensorflow.python.autograph.tests import reference_test_base
label_desc: Use image node_id 1 for calling the NamedTupleSubclass obj's underlying member method code with example usage: obj.foo() and returns: unknown