class_docstr: Implement of GCN
      
class_docstr_tok: ["Implement","of","GCN"]
code: def __init__(self, config, num_class):
      self.num_class = num_class
      self.num_layers = config.get("num_layers", 1)
      self.hidden_size = config.get("hidden_size", 64)
      self.dropout = config.get("dropout", 0.5)
      self.edge_dropout = config.get("edge_dropout", 0.0)
  
imports: import pgl
  import paddle.fluid.layers
  import pgl.layers.conv
label_desc: Use image node_id 1 to create a new GCN object from inherited base classes: object with example: obj = GCN(config, num_class)