text: # example by Roger Pau Monn'e
  import pyopencl as cl
  import numpy as np
  
  demo_r = np.empty((500, 5), dtype=np.uint32)
  ctx = cl.create_some_context()
  queue = cl.CommandQueue(ctx)
  
  mf = cl.mem_flags
  demo_buf = cl.Buffer(ctx, mf.WRITE_ONLY, demo_r.nbytes)
  
  prg = cl.Program(ctx,
  """
  __kernel void demo(__global uint *demo)
  {
      int i;
      int gid = get_global_id(0);
      for(i=0; i<5;i++)
      {
          demo[gid*5+i] = (uint) 1;
      }
  }""")
  
  try:
      prg.build()
  except Exception:
      print("Error:")
      print(prg.get_build_info(ctx.devices[0], cl.program_build_info.LOG))
      raise
  
  prg.demo(queue, (500,), None, demo_buf)
  cl.enqueue_copy(queue, demo_r, demo_buf).wait()
  
  for res in demo_r:
      print(res)
  