old_contents: import pyopencl as cl
  from operator import attrgetter
  
  
  def get_default_device() -> cl.Device:
      '''
      Retrieves the GPU device with the most global memory if available, otherwise returns the CPU.
      '''
      platforms = cl.get_platforms()
      gpu_devices = [plat.get_devices(cl.device_type.GPU) for plat in platforms]
      gpu_devices = [dev for devices in gpu_devices for dev in devices]  # Flatten to 1d if multiple GPU devices exists
  
      if gpu_devices:
          dev = max(gpu_devices, key=attrgetter('global_mem_size'))
          print('Using GPU: {}\n'.format(dev.name))
          return dev
      else:
          cpu_devices = [plat.get_devices(cl.device_type.CPU) for plat in platforms]
          cpu_devices = [dev for devices in cpu_devices for dev in devices]
          if cpu_devices:
              dev = max(cpu_devices, key=attrgetter('global_mem_size'))
              print('Using CPU: {}\n'.format(dev.name))
              return dev
          else:
              print('No suitable OpenCL GPU/CPU devices found')
  
  
  
new_contents: import pyopencl as cl
  from operator import attrgetter
  
  
  def get_default_device() -> cl.Device:
      '''
      Retrieves the GPU device with the most global memory if available, otherwise returns the CPU.
      '''
      platforms = cl.get_platforms()
      gpu_devices = [plat.get_devices(cl.device_type.GPU) for plat in platforms]
      gpu_devices = [dev for devices in gpu_devices for dev in devices]  # Flatten to 1d if multiple GPU devices exists
  
      if gpu_devices:
          dev = max(gpu_devices, key=attrgetter('global_mem_size'))
          print('Using GPU: {}\n'.format(dev.name))
          return dev
      else:
          cpu_devices = [plat.get_devices(cl.device_type.CPU) for plat in platforms]
          cpu_devices = [dev for devices in cpu_devices for dev in devices]
          if cpu_devices:
              dev = max(cpu_devices, key=attrgetter('global_mem_size'))
              print('Using CPU: {}\n'.format(dev.name))
              return dev
          else:
              raise RuntimeError('No suitable OpenCL GPU/CPU devices found')
  
  
  
subject: Update error message