code: """
  Copyright (C) 2019 NVIDIA Corporation.  All rights reserved.
  Licensed under the CC BY-NC-SA 4.0 license (https://creativecommons.org/licenses/by-nc-sa/4.0/legalcode).
  """
  
  import torch.nn as nn
  from torch.nn import init
  
  
  class BaseNetwork(nn.Module):
      def __init__(self):
          super(BaseNetwork, self).__init__()
  
      @staticmethod
      def modify_commandline_options(parser, is_train):
          return parser
  
      def print_network(self):
          if isinstance(self, list):
              self = self[0]
          num_params = 0
          for param in self.parameters():
              num_params += param.numel()
          print('Network [%s] was created. Total number of parameters: %.1f million. '
                'To see the architecture, do print(network).'
                % (type(self).__name__, num_params / 1000000))
  
      def init_weights(self, init_type='normal', gain=0.02):
          def init_func(m):
              classname = m.__class__.__name__
              if classname.find('BatchNorm2d') != -1:
                  if hasattr(m, 'weight') and m.weight is not None:
                      init.normal_(m.weight.data, 1.0, gain)
                  if hasattr(m, 'bias') and m.bias is not None:
                      init.constant_(m.bias.data, 0.0)
              elif hasattr(m, 'weight') and (classname.find('Conv') != -1 or classname.find('Linear') != -1):
                  if init_type == 'normal':
                      init.normal_(m.weight.data, 0.0, gain)
                  elif init_type == 'xavier':
                      init.xavier_normal_(m.weight.data, gain=gain)
                  elif init_type == 'xavier_uniform':
                      init.xavier_uniform_(m.weight.data, gain=1.0)
                  elif init_type == 'kaiming':
                      init.kaiming_normal_(m.weight.data, a=0, mode='fan_in')
                  elif init_type == 'orthogonal':
                      init.orthogonal_(m.weight.data, gain=gain)
                  elif init_type == 'none':  # uses pytorch's default init method
                      m.reset_parameters()
                  else:
                      raise NotImplementedError('initialization method [%s] is not implemented' % init_type)
                  if hasattr(m, 'bias') and m.bias is not None:
                      init.constant_(m.bias.data, 0.0)
  
          self.apply(init_func)
  
          # propagate to children
          for m in self.children():
              if hasattr(m, 'init_weights'):
                  m.init_weights(init_type, gain)
  
apis: torch.nn.init.kaiming_normal_ torch.nn.init.xavier_uniform_ torch.nn.init.constant_ torch.nn.init.xavier_normal_ torch.nn.init.normal_ torch.nn.init.orthogonal_