class_docstr: Stand-in for tf.TensorArray.
code: def grad(self, source, flow=None, name=None):
      raise NotImplementedError(
          "If you need this feature, please email "
          "`tfprobability@tensorflow.org`."
      )
  
imports: import warnings
  import numpy
  from tensorflow_probability.python.internal.backend.numpy import _utils
  from tensorflow_probability.python.internal.backend.numpy import numpy_array
label_desc: Use image node_id 16 for calling the TensorArray obj's underlying member method code with example usage: obj.grad(source, flow, name) without return types