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
  
file_path: chainer/tests/chainer_tests/utils_tests/test_sparse.py
imports: import unittest
  import numpy
  from chainer import testing
  from chainer import utils
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