code: def test_concatenate_many_multi_dtype(self, xp):
      a = testing.shaped_arange((2, 1), xp, "i")
      b = testing.shaped_arange((2, 1), xp, "f")
      return xp.concatenate((a, b) * 1024, axis=1)
  
imports: import numpy
  import pytest
  import cupy
  from cupy import testing
  from cupy import cuda
label_desc: Use image node_id 15 for calling the TestJoin obj's underlying member method code with example usage: obj.test_concatenate_many_multi_dtype(xp) and returns: xp