message: Fix typo in error message for set_caching_device
diff: @@ -999,7 +999,7 @@ class VariableScope(object):
  def set_caching_device(self, caching_device):
  """Set caching_device for this scope."""
  if context.in_eager_mode():
  - raise NotImplementedError("Partitioned variables are not yet supported "
  + raise NotImplementedError("Caching devices are not yet supported "
  "in Eager mode.")
  self._caching_device = caching_device
  