message: ipu_estimator_test: Set shard_count to 4 to speed up test
  Summary:
  Reducing the number of train/eval steps did not seem to help
  as the time was dominated by poplar compilation. So let's
  parallelize instead.
  Reviewers: georgep
  Subscribers: shauryas
diff: @@ -206,7 +206,8 @@ tf_py_test(
  tf_py_test(
  name = "ipu_estimator_test",
  - size = "medium",
  + size = "large",
  + shard_count = 4,
  srcs = ["tests/ipu_estimator_test.py"],
  additional_deps = [
  "//tensorflow/compiler/plugin/poplar:test_utils_py",
  