code: def test_f16_nonzero(mode=None, op_to_check=rng_mrg.mrg_uniform):
      srng = MRG_RandomStreams(seed=utt.fetch_seed())
      m = srng.uniform(size=(1000, 1000), dtype="float16")
      assert m.dtype == "float16", m.type
      f = theano.function([], m, mode=mode)
      assert any(
          isinstance(n.op, op_to_check)
          for n in f.maker.fgraph.apply_nodes
      )
      m_val = f()
      assert np.all((0 < m_val) & (m_val < 1))
  
imports: from __future__ import absolute_import, print_function, division
  import os
  import sys
  import time
  import unittest
  from nose.tools import assert_raises
  import numpy
  from six.moves import xrange
  import theano
  from theano import change_flags, config, tensor
  from theano.sandbox import rng_mrg
  from theano.sandbox.rng_mrg import MRG_RandomStreams
  from theano.tests import unittest_tools
  from theano.tests.unittest_tools import attr
label_desc: Use image node_id 25 for calling a global function with example usage: test_f16_nonzero(mode, op_to_check) without return types