class_docstr: Densenet-BC model class, based on
  `"Densely Connected Convolutional Networks" <https://arxiv.org/pdf/1608.06993.pdf>`_
  
  Args:
      growth_rate (int) - how many filters to add each layer (`k` in paper)
      block_config (list of 4 ints) - how many layers in each pooling block
      num_init_features (int) - the number of filters to learn in the first convolution layer
      bn_size (int) - multiplicative factor for number of bottle neck layers
        (i.e. bn_size * k features in the bottleneck layer)
      drop_rate (float) - dropout rate after each dense layer
      num_classes (int) - number of classification classes
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code: def __init__(
      self,
      growth_rate=32,
      block_config=(6, 12, 24, 16),
      num_init_features=64,
      bn_size=4,
      drop_rate=0,
      num_classes=1000,
  ):
      super(SEDenseNet, self).__init__()
  
      # First convolution
      self.features = nn.Sequential(
          OrderedDict(
              [
                  (
                      "conv0",
                      nn.Conv2d(
                          3,
                          num_init_features,
                          kernel_size=7,
                          stride=2,
                          padding=3,
                          bias=False,
                      ),
                  ),
                  ("norm0", nn.BatchNorm2d(num_init_features)),
                  ("relu0", nn.ReLU(inplace=True)),
                  (
                      "pool0",
                      nn.MaxPool2d(kernel_size=3, stride=2, padding=1),
                  ),
              ]
          )
      )
  
      # Add SELayer at first convolution
      # self.features.add_module("SELayer_0a", SELayer(channel=num_init_features))
  
      # Each denseblock
      num_features = num_init_features
      for i, num_layers in enumerate(block_config):
          # Add a SELayer
          # self.features.add_module("SELayer_%da" % (i + 1), SELayer(channel=num_features))
  
          block = _DenseBlock(
              num_layers=num_layers,
              num_input_features=num_features,
              bn_size=bn_size,
              growth_rate=growth_rate,
              drop_rate=drop_rate,
          )
          self.features.add_module("denseblock%d" % (i + 1), block)
  
          num_features = num_features + num_layers * growth_rate
  
          if i != len(block_config) - 1:
              # Add a SELayer behind each transition block
              # self.features.add_module("SELayer_%db" % (i + 1), SELayer(channel=num_features))
  
              trans = _Transition(
                  num_input_features=num_features,
                  num_output_features=num_features // 2,
              )
              self.features.add_module("transition%d" % (i + 1), trans)
              num_features = num_features // 2
  
      # Final batch norm
      self.features.add_module("norm5", nn.BatchNorm2d(num_features))
  
      # Add SELayer
      # self.features.add_module("SELayer_0b", SELayer(channel=num_features))
  
      # Linear layer
      self.classifier = nn.Linear(num_features, num_classes)
  
      # Official init from torch repo.
      for m in self.modules():
          if isinstance(m, nn.Conv2d):
              nn.init.kaiming_normal_(m.weight)
          elif isinstance(m, nn.BatchNorm2d):
              nn.init.constant_(m.weight, 1)
              nn.init.constant_(m.bias, 0)
          elif isinstance(m, nn.Linear):
              nn.init.constant_(m.bias, 0)
  
imports: import re
  import torch
  import torch.nn
  import torch.nn.functional
  import torch.utils.model_zoo
  from collections import OrderedDict
  from .se_module import SELayer
label_desc: Use image node_id 1 to create a new SEDenseNet object from inherited base classes: nn with example: obj = SEDenseNet(growth_rate, block_config, num_init_features, bn_size, drop_rate, num_classes)