Pytorch 实现冻结指定卷积层的参数

    for i, para in enumerate(self._net.module.features.parameters()):
      if i < 16:
        para.requires_grad = False
      else:
        para.requires_grad = True
    # Solver.
    # self._solver = torch.optim.SGD(
    #   self._net.parameters(), lr=self._options['base_lr'],
    #   momentum=0.9, weight_decay=self._options['weight_decay'])
    self._solver = torch.optim.SGD(
      self._net.module.parameters(), lr=self._options['base_lr'],
      momentum=0.9, weight_decay=self._options['weight_decay'])