code: def _setup_tensor(_min, _max, shape, dtype, threshold=None):
      y = numpy.random.uniform(_min, _max, shape).astype(dtype)
      if threshold is not None:
          y[y < threshold] = 0
      return y
  
imports: import unittest
  import numpy
  import chainer
  from chainer import cuda
  import chainer.functions
  from chainer import gradient_check
  from chainer import testing
  from chainer.testing import attr
  from chainer import utils
  from chainer.utils import type_check
label_desc: Use image node_id 1 for calling a global function with example usage: _setup_tensor(_min, _max, shape, dtype, threshold) and returns: y