code: def forward(self, x, out_feat_keys=None):
      feat = x
      # we first apply sobel filter
      feat = self.sobel(feat)
      out_feats = get_trunk_forward_outputs_module_list(
          feat, out_feat_keys, self._feature_blocks, self.all_feat_names
      )
      return out_feats
  
file_path: vissl/vissl/models/trunks/alexnet_deepcluster.py
imports: import torch
  import torch.nn
  from vissl.config import AttrDict
  from vissl.models.model_helpers import Flatten, get_trunk_forward_outputs_module_list
  from vissl.models.trunks import register_model_trunk
label_desc: Use image node_id 2 for calling the AlexNetDeepCluster obj's underlying member method code with example usage: obj.forward(x, out_feat_keys) and returns: out_feats