code: def __init__(self, g, sample_size: int = 3000, num_steps: int = 1000):
      self.num_steps = num_steps
      self.sample_size = sample_size
      self.eids = np.arange(g.num_edges())
      self.g = g
      self.num_nodes = g.num_nodes()
  
imports: import logging
  import numpy
  import pandas
  from typing import Optional, Union, Callable, List, TYPE_CHECKING, Any, Tuple
  from .PlotterBase import Plottable
  from .compute.ComputeMixin import ComputeMixin
label_desc: Use image node_id 1 to create a new SubgraphIterator object  with example: obj = SubgraphIterator(g, sample_size, num_steps)