message: Use concurreny processing by default
diff: @@ -53,7 +53,7 @@ class Coordinator:
  "Round {}/{}: Participants {}".format(r + 1, num_rounds, indices)
  )
  # Train
  - self.fit_round_seq(indices)
  + self.fit_round_con(indices)
  # Evaluate
  if self.xy_val:
  loss, acc = self.evaluate(self.xy_val)
  