code: def __init__(self, num_destins):
      self.num_destins = num_destins
      self.num_sources = 2 * num_destins
  
imports: import logging
  import math
  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 OneTwoMatchingConstraint object from inherited base classes: constraints with example: obj = OneTwoMatchingConstraint(num_destins)