class_docstr: The network morphism search tree.
class_docstr_tok: ["The","network","morphism","search","tree","."]
code: def __init__(self):
      self.root = None
      self.adj_list = {}
  
imports: import math
  import random
  from copy import deepcopy
  from functools import total_ordering
  from queue import PriorityQueue
  import numpy
  from scipy.linalg import LinAlgError, cho_solve, cholesky, solve_triangular
  from scipy.optimize import linear_sum_assignment
  from sklearn.metrics.pairwise import rbf_kernel
  from nni.utils import OptimizeMode
  from .graph_transformer import transform
  from .utils import Constant
  from .layers import is_layer
label_desc: Use image node_id 1 to create a new SearchTree object  with example: obj = SearchTree()