message: Use remote buffers by default if possible
  Summary:
  Make the pipelining API and the estimator one consistent.
  Ref T15698
  Reviewers: #tensorflow, #framework_ip_review_-_any_oss_or_third-party_code_use_has_been_approved, hakons, jakeh
  Maniphest Tasks: T15698
diff: @@ -54,7 +54,7 @@ class IPUPipelineEstimatorSpec(
  optimizer_function=None,
  device_mapping=None,
  pipeline_schedule=None,
  - offload_weight_update_variables=False):
  + offload_weight_update_variables=True):
  """Creates a validated `IPUPipelineEstimatorSpec` instance.
  Depending on the value of `mode`, different arguments are required. Namely
  