code: def testForwardprop(self):
      x = np.asarray([1.0, 2.0])
      xt = np.asarray([3.0, 4.0])
      with tf.autodiff.ForwardAccumulator(x, xt) as acc:
          y = x * 2.0
      yt = acc.jvp(y)
      self.assertIsInstance(yt, np.ndarray)
      self.assertAllClose([6.0, 8.0], yt)
      z = np.asarray([1.0])
      self.assertIsNone(acc.jvp(z))
  
imports: import numpy
  import tensorflow.compat.v2
  from tensorflow.python.framework import ops
  from tensorflow.python.framework import test_util
  from tensorflow.python.ops.numpy_ops import np_math_ops
label_desc: Use image node_id 19 for calling the InteropTest obj's underlying member method code with example usage: obj.testForwardprop() without return types