message: Issue:#46004
  Context:
  Initial changes resulted in merge conflicts. As a result,I had to
  come up with a different approach since _SHARDED_SUFFIX is a tensor now.
  Solution:
  Add os.path.normpath function to _temp/part instead
  Additional:
  Adding comments
diff: @@ -228,7 +228,8 @@ class BaseSaverBuilder(object):
  # Transformations:
  # * Users pass in "save_path" in save() and restore(). Say "myckpt".
  # * checkpoint_prefix gets fed <save_path><_SHARDED_SUFFIX>.
  - #
  + # * If checkpoint_prefix is a S3 bucket path ".part" is appended to it
  + # * Otherwise _temp/part is appended which is normalized relative to the OS
  # Example:
  # During runtime, a temporary directory is first created, which contains
  # files
  @@ -254,7 +255,7 @@ class BaseSaverBuilder(object):
  _SHARDED_SUFFIX = array_ops.where(
  string_ops.regex_full_match(checkpoint_prefix, "^s3://.*"),
  constant_op.constant(".part"),
  - constant_op.constant("_temp/part"))
  + constant_op.constant(os.path.normpath("_temp/part")))
  tmp_checkpoint_prefix = string_ops.string_join(
  [checkpoint_prefix, _SHARDED_SUFFIX])
  