code: def testMatmul(self):
      operands = [([[1, 2]], [[3, 4, 5], [6, 7, 8]])]
      return self._testBinaryOp(
          np_math_ops.matmul, np.matmul, "matmul", operands=operands
      )
  
imports: import itertools
  from absl.testing import parameterized
  import numpy
  from tensorflow.python.framework import errors
  from tensorflow.python.framework import ops
  from tensorflow.python.framework import tensor
  from tensorflow.python.ops.numpy_ops import np_array_ops
  from tensorflow.python.ops.numpy_ops import np_arrays
  from tensorflow.python.ops.numpy_ops import np_math_ops
  from tensorflow.python.platform import test
label_desc: Use image node_id 6 for calling the MathTest obj's underlying member method code with example usage: obj.testMatmul() and returns: self