Convert a TensorEvent into a JSON-compatible response.

def process_string_tensor_event(event):
  """Convert a TensorEvent into a JSON-compatible response."""
  string_arr = tensor_util.make_ndarray(event.tensor_proto)
  html = text_array_to_html(string_arr)
  return {
      'wall_time': event.wall_time,
      'step': event.step,
      'text': html,
  }