code: def test_memcpy(dtype):
      data = np.random.uniform(0, 255, size=(100, 99)).astype(dtype)
      dst = np.empty((100, 99), dtype=dtype)
  
      assert_that(np.all(data == dst)).is_false()
      memcpy(data, dst)
  
      assert_that(np.all(data == dst)).is_true()
  
imports: import numpy
  import pytest
  from assertpy import assert_that
  from ffcv.libffcv import memcpy
label_desc: Use image node_id 1 for calling a global function with example usage: test_memcpy(dtype) without return types