code: def datagen():
      return _DataSampler(np.random.uniform(size=(1000, 10)))
  
imports: import io
  import itertools
  import re
  import cloudpickle
  import numpy
  import pytensor
  import pytensor.tensor
  import pytest
  from pytensor import shared
  from pytensor.tensor.variable import TensorVariable
  import pymc
  from pymc.data import is_minibatch
  from pymc.pytensorf import GeneratorOp, floatX
label_desc: Use image node_id 3 for calling a global function with example usage: datagen() and returns: _DataSampler