class_docstr: FeatureExtractor of GRCNN (https://papers.nips.cc/paper/6637-gated-recurrent-convolution-neural-network-for-ocr.pdf) 
code: def forward(self, input):
      return self.ConvNet(input)
  
imports: import torch.nn
  import torch.nn.functional
label_desc: Use image node_id 2 for calling the RCNN_FeatureExtractor obj's underlying member method code with example usage: obj.forward(input) and returns: self