code: def __init__(self, idx2node, temp_path):
      self.idx2node = idx2node
      self.idx = list(range(len(self.idx2node)))
      self.temp_path = temp_path
      pass
  
imports: import itertools
  import math
  import random
  import pandas
  from joblib import Parallel, delayed
  from .alias import alias_sample, create_alias_table
  from .utils import partition_num
label_desc: Use image node_id 1 to create a new BiasedWalker object  with example: obj = BiasedWalker(idx2node, temp_path)