code: def slow(t):
      """
      Label a test as 'slow'.
  
      The exact definition of a slow test is obviously both subjective and
      hardware-dependent, but in general any individual test that requires more
      than a second or two should be labeled as slow (the whole suite consists of
      thousands of tests, so even a second is significant).
  
      Parameters
      ----------
      t : callable
          The test to label as slow.
  
      Returns
      -------
      t : callable
          The decorated test `t`.
  
      Examples
      --------
      The `numpy.testing` module includes ``import decorators as dec``.
      A test can be decorated as slow like this::
  
        from numpy.testing import *
  
        @dec.slow
        def test_big(self):
            print('Big, slow test')
  
      """
  
      t.slow = True
      return t
  
imports: from __future__ import division, absolute_import, print_function
  from .utils import SkipTest, assert_warns, HAS_REFCOUNT
label_desc: Use image node_id 1 for calling a global function with example usage: slow(t) and returns: t