code: def __init__(self, num_nodes):
      self.num_nodes = num_nodes
  
imports: import itertools
  import logging
  import warnings
  import torch
  from torch.distributions import constraints
  from torch.distributions.utils import lazy_property
  from .torch import Categorical
  from .torch_distribution import TorchDistribution
label_desc: Use image node_id 1 to create a new OneOneMatchingConstraint object from inherited base classes: constraints with example: obj = OneOneMatchingConstraint(num_nodes)