diff --git a/configs/search-opts/DARTS-NASNet-CIFAR.config b/configs/search-opts/DARTS-NASNet-CIFAR.config
index b4f0756..4fb4a27 100644
--- a/configs/search-opts/DARTS-NASNet-CIFAR.config
+++ b/configs/search-opts/DARTS-NASNet-CIFAR.config
@@ -9,5 +9,5 @@
   "momentum" : ["float", "0.9"],
   "nesterov" : ["bool",  "1"],
   "criterion": ["str",   "Softmax"],
-  "batch_size": ["int",  "256"]
+  "batch_size": ["int",  "64"]
 }
diff --git a/lib/models/__init__.py b/lib/models/__init__.py
index 456f26c..27581fa 100644
--- a/lib/models/__init__.py
+++ b/lib/models/__init__.py
@@ -2,6 +2,7 @@
 # Copyright (c) Xuanyi Dong [GitHub D-X-Y], 2019 #
 ##################################################
 from os import path as osp
+from typing import List, Text
 
 __all__ = ['change_key', 'get_cell_based_tiny_net', 'get_search_spaces', 'get_cifar_models', 'get_imagenet_models', \
            'obtain_model', 'obtain_search_model', 'load_net_from_checkpoint', \
@@ -42,7 +43,7 @@ def get_cell_based_tiny_net(config):
 
 
 # obtain the search space, i.e., a dict mapping the operation name into a python-function for this op
-def get_search_spaces(xtype, name):
+def get_search_spaces(xtype, name) -> List[Text]:
   if xtype == 'cell':
     from .cell_operations import SearchSpaceNames
     assert name in SearchSpaceNames, 'invalid name [{:}] in {:}'.format(name, SearchSpaceNames.keys())
diff --git a/lib/models/cell_searchs/search_model_darts_nasnet.py b/lib/models/cell_searchs/search_model_darts_nasnet.py
index 9702f48..85c275c 100644
--- a/lib/models/cell_searchs/search_model_darts_nasnet.py
+++ b/lib/models/cell_searchs/search_model_darts_nasnet.py
@@ -4,6 +4,7 @@
 import torch
 import torch.nn as nn
 from copy import deepcopy
+from typing import List, Text, Dict
 from .search_cells     import NASNetSearchCell as SearchCell
 from .genotypes        import Structure
 
@@ -11,7 +12,7 @@ from .genotypes        import Structure
 # The macro structure is based on NASNet
 class NASNetworkDARTS(nn.Module):
 
-  def __init__(self, C, N, steps, multiplier, stem_multiplier, num_classes, search_space, affine, track_running_stats):
+  def __init__(self, C: int, N: int, steps: int, multiplier: int, stem_multiplier: int, num_classes: int, search_space: List[Text], affine: bool, track_running_stats: bool):
     super(NASNetworkDARTS, self).__init__()
     self._C        = C
     self._layerN   = N
@@ -44,31 +45,31 @@ class NASNetworkDARTS(nn.Module):
     self.arch_normal_parameters = nn.Parameter( 1e-3*torch.randn(num_edge, len(search_space)) )
     self.arch_reduce_parameters = nn.Parameter( 1e-3*torch.randn(num_edge, len(search_space)) )
 
-  def get_weights(self):
+  def get_weights(self) -> List[torch.nn.Parameter]:
     xlist = list( self.stem.parameters() ) + list( self.cells.parameters() )
     xlist+= list( self.lastact.parameters() ) + list( self.global_pooling.parameters() )
     xlist+= list( self.classifier.parameters() )
     return xlist
 
-  def get_alphas(self):
+  def get_alphas(self) -> List[torch.nn.Parameter]:
     return [self.arch_normal_parameters, self.arch_reduce_parameters]
 
-  def show_alphas(self):
+  def show_alphas(self) -> Text:
     with torch.no_grad():
       A = 'arch-normal-parameters :\n{:}'.format( nn.functional.softmax(self.arch_normal_parameters, dim=-1).cpu() )
       B = 'arch-reduce-parameters :\n{:}'.format( nn.functional.softmax(self.arch_reduce_parameters, dim=-1).cpu() )
     return '{:}\n{:}'.format(A, B)
 
-  def get_message(self):
+  def get_message(self) -> Text:
     string = self.extra_repr()
     for i, cell in enumerate(self.cells):
       string += '\n {:02d}/{:02d} :: {:}'.format(i, len(self.cells), cell.extra_repr())
     return string
 
-  def extra_repr(self):
+  def extra_repr(self) -> Text:
     return ('{name}(C={_C}, N={_layerN}, steps={_steps}, multiplier={_multiplier}, L={_Layer})'.format(name=self.__class__.__name__, **self.__dict__))
 
-  def genotype(self):
+  def genotype(self) -> Dict[Text, List]:
     def _parse(weights):
       gene = []
       for i in range(self._steps):
diff --git a/lib/nas_201_api/api.py b/lib/nas_201_api/api.py
index 1c9e111..00ab752 100644
--- a/lib/nas_201_api/api.py
+++ b/lib/nas_201_api/api.py
@@ -37,9 +37,12 @@ def print_information(information, extra_info=None, show=False):
   if show: print('\n'.join(strings))
   return strings
 
-
+"""
+This is the class for API of NAS-Bench-201.
+"""
 class NASBench201API(object):
 
+  """ The initialization function that takes the dataset file path (or a dict loaded from that path) as input. """
   def __init__(self, file_path_or_dict, verbose=True):
     if isinstance(file_path_or_dict, str):
       if verbose: print('try to create the NAS-Bench-201 api from {:}'.format(file_path_or_dict))
@@ -49,6 +52,7 @@ class NASBench201API(object):
       file_path_or_dict = copy.deepcopy( file_path_or_dict )
     else: raise ValueError('invalid type : {:} not in [str, dict]'.format(type(file_path_or_dict)))
     assert isinstance(file_path_or_dict, dict), 'It should be a dict instead of {:}'.format(type(file_path_or_dict))
+    self.verbose = verbose # [TODO] a flag indicating whether to print more logs
     keys = ('meta_archs', 'arch2infos', 'evaluated_indexes')
     for key in keys: assert key in file_path_or_dict, 'Can not find key[{:}] in the dict'.format(key)
     self.meta_archs = copy.deepcopy( file_path_or_dict['meta_archs'] )