code: def make_matrix(self, shape, dtype):
      r_dtype = dtype
      if dtype == numpy.complex64:
          r_dtype = numpy.float32
      elif dtype == numpy.complex128:
          r_dtype = numpy.float64
      a = self.make_random_array(shape, r_dtype)
      if dtype.char in "FD":
          a = a + 1j * self.make_random_array(shape, r_dtype)
      return a
  
imports: import gc
  import numpy
  import pytest
  import cupy
  from cupy._core import _routines_linalg
  from cupy import testing
  from cupy.cuda import device
  from cupy.cuda import cutensor
label_desc: Use image node_id 2 for calling the TestCuTensorContraction obj's underlying member method code with example usage: obj.make_matrix(shape, dtype) and returns: a