message: Pass the `validation_freq` argument to enable custom validation frequency in distribution strategy cases.
diff: @@ -812,7 +812,8 @@ class Model(Network):
  sample_weight=sample_weight,
  initial_epoch=initial_epoch,
  steps_per_epoch=steps_per_epoch,
  - validation_steps=validation_steps)
  + validation_steps=validation_steps,
  + validation_freq=validation_freq)
  # Independent worker only for now.
  return dc.run_distribute_coordinator(
  @@ -836,7 +837,8 @@ class Model(Network):
  sample_weight=sample_weight,
  initial_epoch=initial_epoch,
  steps_per_epoch=steps_per_epoch,
  - validation_steps=validation_steps)
  + validation_steps=validation_steps,
  + validation_freq=validation_freq)
  batch_size = self._validate_or_infer_batch_size(
  batch_size, steps_per_epoch, x)
  