code: def test_tocsr_copy(self, xp, sp):
      m = self.make(xp, sp, self.dtype)
      n = m.tocsr(copy=True)
      assert m.data is not n.data
      return n
  
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 15 for calling the TestDiaMatrixScipyComparison obj's underlying member method code with example usage: obj.test_tocsr_copy(xp, sp) and returns: n