code: def _make_empty(xp, sp, dtype):
      data = xp.array([[]], "f")
      offsets = xp.array([0], "i")
      return sp.dia_matrix((data, offsets), shape=(3, 4))
  
imports: import pickle
  import unittest
  import numpy
  import pytest
  import cupy
  from cupy import testing
  from cupy.cuda import driver
  from cupy.cuda import runtime
  from cupyx.scipy import sparse
label_desc: Use image node_id 3 for calling a global function with example usage: _make_empty(xp, sp, dtype) and returns: sp