code: def testUnary(self):
      self._check("->", ())
      self._check("ab->", (3, 3))
      self._check("ab->ab", (3, 3))
      self._check("abc->b", (3, 4, 5))
      self._check("abc->ca", (3, 4, 5))
      self._check("abc->cab", (3, 4, 5))
  
imports: import numpy
  from tensorflow.python.client import session
  from tensorflow.python.framework import constant_op
  from tensorflow.python.framework import dtypes
  from tensorflow.python.framework import errors
  from tensorflow.python.framework import ops
  from tensorflow.python.framework import test_util
  from tensorflow.python.ops import array_ops
  from tensorflow.python.ops import gen_linalg_ops
  from tensorflow.python.ops import gradient_checker_v2
  from tensorflow.python.ops import special_math_ops
  from tensorflow.python.ops import variables
  from tensorflow.python.platform import benchmark
  from tensorflow.python.platform import test
label_desc: Use image node_id 2 for calling the EinsumOpTest obj's underlying member method code with example usage: obj.testUnary() without return types