code: def forward(self, features):
      h = features
      for layer in self.layers:
          h = layer(self.g, h)
      return h
  
file_path: dgl/examples/mxnet/graphsage/main.py
imports: import argparse
  import time
  import dgl
  import mxnet
  import networkx
  import numpy
  from dgl.data import CiteseerGraphDataset, CoraGraphDataset, PubmedGraphDataset, register_data_args
  from dgl.nn.mxnet.conv import SAGEConv
  from mxnet import gluon, nd
  from mxnet.gluon import nn
label_desc: Use image node_id 2 for calling the GraphSAGE obj's underlying member method code with example usage: obj.forward(features) and returns: h