code: def on_backward_end(self, iteration:int, **kwargs)->None:
          "Callback function that writes backward end appropriate data to Tensorboard."
          if iteration == 0: return
          self._update_batches_if_needed()
          if iteration % self.stats_iters == 0: self._write_model_stats(iteration=iterationf on_backward_end(self, iteration:int, **kwargs)->None:
          "Callback function that writes backward end appropriate data to Tensorboard."
          if iteration == 0: return
          self._update_batches_if_needed()
          if iteration % self.stats_iters == 0: self._write_model_stats(iteration=iteration)
docs: Callback function that writes backward end appropriate data to Tensorboard.