code: def cbpdnmsk_class_label_lookup(label):
      
  
      clsmod = {'admm': admm_cbpdn.ConvBPDNMaskDcpl,
                'fista': fista_cbpdn.ConvBPDNMask}
      if label in clsmod:
          return clsmod[label]
      else:
          raise ValueError('Unknown ConvBPDNMask solver method %s' % label)
docs: Get a ConvBPDNMask class from a label string.