class_docstr: AlexNetLegacy model as backbone
code: def hybrid_forward(self, F, x):
      x = self.features(x)
      return x
  
file_path: gluon-cv/gluoncv/model_zoo/siamrpn/siam_alexnet.py
imports: from __future__ import division
  from mxnet.gluon import nn
  from mxnet.gluon.block import HybridBlock
  from mxnet.context import cpu
label_desc: Use image node_id 2 for calling the AlexNetLegacy obj's underlying member method code with example usage: obj.hybrid_forward(F, x) and returns: x