code: def build(self):
      self._build()
      # TF graph management
      self._loss()
      self._minimize()
      self._accuracy()
  
imports: from collections import namedtuple
  import tensorflow
  import math
  import graphsage.layers
  import graphsage.metrics
  from .prediction import BipartiteEdgePredLayer
  from .aggregators import MeanAggregator, MaxPoolingAggregator, MeanPoolingAggregator, SeqAggregator, GCNAggregator
label_desc: Use image node_id 3 for calling the Node2VecModel obj's underlying member method code with example usage: obj.build() without return types