message: shard some estimator tests
diff: @@ -171,6 +171,7 @@ py_test(
  name = "baseline_test",
  size = "medium",
  srcs = ["canned/baseline_test.py"],
  + shard_count = 4,
  srcs_version = "PY2AND3",
  tags = [
  "no_pip",
  @@ -207,6 +208,7 @@ py_test(
  name = "boosted_trees_test",
  size = "medium",
  srcs = ["canned/boosted_trees_test.py"],
  + shard_count = 2,
  srcs_version = "PY2AND3",
  tags = [
  "optonly",
  @@ -676,6 +678,7 @@ py_test(
  name = "keras_test",
  size = "large",
  srcs = ["keras_test.py"],
  + shard_count = 4,
  srcs_version = "PY2AND3",
  tags = [
  "no_windows",
  