old_contents: class mlp():
      optimizer = 'Adam'
      max_grad_norm = 5
      batch_size = 128
      n_hidden = 200
      n_layers = 3
      dropout = 0.3
      step_size = 1
      neg_weight = 1
      batch_norm = False
      ckp_dir = 'output/buzzer/mlp_buzzer.ckp'
      model_dir = 'output/buzzer/mlp_buzzer.npz'
  
  class rnn():
      optimizer = 'Adam'
      max_grad_norm = 5
      batch_size = 128
      n_hidden = 128
      ckp_dir = 'output/buzzer/rnn_buzzer.ckp'
      model_dir = 'output/buzzer/rnn_buzzer.npz'
  
new_contents: class mlp():
      optimizer = 'Adam'
      max_grad_norm = 5
      batch_size = 128
      n_hidden = 100
      n_layers = 3
      dropout = 0.3
      step_size = 1
      neg_weight = 1
      batch_norm = False
      ckp_dir = 'output/buzzer/mlp_buzzer.ckp'
      model_dir = 'output/buzzer/mlp_buzzer.npz'
  
  class rnn():
      optimizer = 'Adam'
      max_grad_norm = 5
      batch_size = 128
      n_hidden = 128
      ckp_dir = 'output/buzzer/rnn_buzzer.ckp'
      model_dir = 'output/buzzer/rnn_buzzer.npz'
  
subject: change default config