code: def __init__(self, g, out_feats, activation, dropout):
      super(GCNLayer, self).__init__()
      self.g = g
      self.dense = gluon.nn.Dense(out_feats, activation)
      self.dropout = dropout
  
file_path: dgl/examples/mxnet/gcn/gcn_concat.py
imports: import argparse
  import time
  import dgl
  import dgl.function
  import mxnet
  import numpy
  from dgl.data import CiteseerGraphDataset, CoraGraphDataset, PubmedGraphDataset, register_data_args
  from mxnet import gluon
label_desc: Use image node_id 1 to create a new GCNLayer object from inherited base classes: gluon with example: obj = GCNLayer(g, out_feats, activation, dropout)