code: def choose(n: int, k: int) -> int:
      """
      Simple implementation of math.comb for Python 3.7 compatibility.
      """
      if 0 <= k <= n:
          ntok = 1
          ktok = 1
          for t in range(1, min(k, n - k) + 1):
              ntok *= n
              ktok *= t
              n -= 1
          return ntok // ktok
      else:
          return 0
  
imports: from typing import Dict, List, Optional, Tuple
  import torch
  from torch import nn
  from torchrec.datasets.utils import Batch
  from torchrec.modules.crossnet import LowRankCrossNet
  from torchrec.modules.embedding_modules import EmbeddingBagCollection
  from torchrec.modules.mlp import MLP
  from torchrec.sparse.jagged_tensor import KeyedJaggedTensor, KeyedTensor
label_desc: Use image node_id 1 for calling a global function with example usage: choose(n, k) and returns: unknown, int