text: from collections import namedtuple
  
  Genotype = namedtuple('Genotype', 'normal normal_concat reduce reduce_concat')
  
  PRIMITIVES = [
      # 'none',
      'max_pool_3x3',
      'avg_pool_3x3',
      'skip_connect',
      'sep_conv_3x3',
      'sep_conv_5x5',
      'dil_conv_3x3',
      'dil_conv_5x5'
  ]
  
  NASNet = Genotype(
      normal=[
          ('sep_conv_5x5', 1),
          ('sep_conv_3x3', 0),
          ('sep_conv_5x5', 0),
          ('sep_conv_3x3', 0),
          ('avg_pool_3x3', 1),
          ('skip_connect', 0),
          ('avg_pool_3x3', 0),
          ('avg_pool_3x3', 0),
          ('sep_conv_3x3', 1),
          ('skip_connect', 1),
      ],
      normal_concat=[2, 3, 4, 5, 6],
      reduce=[
          ('sep_conv_5x5', 1),
          ('sep_conv_7x7', 0),
          ('max_pool_3x3', 1),
          ('sep_conv_7x7', 0),
          ('avg_pool_3x3', 1),
          ('sep_conv_5x5', 0),
          ('skip_connect', 3),
          ('avg_pool_3x3', 2),
          ('sep_conv_3x3', 2),
          ('max_pool_3x3', 1),
      ],
      reduce_concat=[4, 5, 6],
  )
  
  AmoebaNet = Genotype(
      normal=[
          ('avg_pool_3x3', 0),
          ('max_pool_3x3', 1),
          ('sep_conv_3x3', 0),
          ('sep_conv_5x5', 2),
          ('sep_conv_3x3', 0),
          ('avg_pool_3x3', 3),
          ('sep_conv_3x3', 1),
          ('skip_connect', 1),
          ('skip_connect', 0),
          ('avg_pool_3x3', 1),
      ],
      normal_concat=[4, 5, 6],
      reduce=[
          ('avg_pool_3x3', 0),
          ('sep_conv_3x3', 1),
          ('max_pool_3x3', 0),
          ('sep_conv_7x7', 2),
          ('sep_conv_7x7', 0),
          ('avg_pool_3x3', 1),
          ('max_pool_3x3', 0),
          ('max_pool_3x3', 1),
          ('conv_7x1_1x7', 0),
          ('sep_conv_3x3', 5),
      ],
      reduce_concat=[3, 4, 6]
  )
  
  DARTS_V1 = Genotype(
      normal=[('sep_conv_3x3', 1), ('sep_conv_3x3', 0), ('skip_connect', 0), ('sep_conv_3x3', 1), ('skip_connect', 0),
              ('sep_conv_3x3', 1), ('sep_conv_3x3', 0), ('skip_connect', 2)], normal_concat=[2, 3, 4, 5],
      reduce=[('max_pool_3x3', 0), ('max_pool_3x3', 1), ('skip_connect', 2), ('max_pool_3x3', 0), ('max_pool_3x3', 0),
              ('skip_connect', 2), ('skip_connect', 2), ('avg_pool_3x3', 0)], reduce_concat=[2, 3, 4, 5])
  DARTS_V2 = Genotype(
      normal=[('sep_conv_3x3', 0), ('sep_conv_3x3', 1), ('sep_conv_3x3', 0), ('sep_conv_3x3', 1), ('sep_conv_3x3', 1),
              ('skip_connect', 0), ('skip_connect', 0), ('dil_conv_3x3', 2)], normal_concat=[2, 3, 4, 5],
      reduce=[('max_pool_3x3', 0), ('max_pool_3x3', 1), ('skip_connect', 2), ('max_pool_3x3', 1), ('max_pool_3x3', 0),
              ('skip_connect', 2), ('skip_connect', 2), ('max_pool_3x3', 1)], reduce_concat=[2, 3, 4, 5])
  
  DARTS = DARTS_V2
  