(value=None)
return value
Returns how many devices to use (if None, default, use all available).
Returns how many devices to use (if None, default, use all available).
Returns how many devices to use ( if None default use all available ) .
def num_devices(value=None):
  """Returns how many devices to use (if None, default, use all available)."""
  return value
def num_devices ( value = None ) : return value