remove empty line

deepxde/model.py

@@ -666,7 +666,6 @@ def _train_sgd(self, iterations, display_every):
  for i in range(iterations):
  self.callbacks.on_epoch_begin()
  self.callbacks.on_batch_begin()
-
  self.train_state.set_data_train(
  *self.data.train_next_batch(self.batch_size)
  )