code: def test_builder_maximum(self):
      x = np.array([[1, 2, 3], [4, 5, 6]], dtype=np.float32)
      y = np.array([[-1, 2, -3], [4, -5, 6]], dtype=np.float32)
      expected_outputs = np.array(
          [[1, 2, 3], [4, 5, 6]], dtype=np.float32
      )
      v = mb.maximum(x=x, y=y)
      assert is_close(expected_outputs, v.val)
  
imports: from coremltools.converters.mil import testing_reqs
  from coremltools.converters.mil.testing_reqs import *
  from .testing_utils import run_compare_builder
label_desc: Use image node_id 4 for calling the TestElementwiseBinary obj's underlying member method code with example usage: obj.test_builder_maximum() without return types