code: def random_weights():
      def get_weights():
          tmp = np.random.random(np.random.randint(1, 10)).astype(
              np.float32
          )
          return tmp
  
      return fn.external_source(get_weights, batch=False)
  
imports: from nose_utils import assert_raises
  import nvidia.dali
  import nvidia.dali.fn
  import nvidia.dali.ops
  import numpy
  import scipy.ndimage
  import scipy.ndimage.measurements
  import random
  from test_utils import check_batch, np_type_to_dali
  from nose.tools import nottest
  from nose.plugins.attrib import attr
label_desc: Use image node_id 19 for calling a global function with example usage: random_weights() and returns: fn, tmp