class_docstr: Train Task for the TwoTower model. Adds BinaryCrossEntropy Loss.  to use with train_pipeline
  
  Args:
      two_tower (TwoTower): two tower model
  
  Example::
  
      m = TwoTowerTrainTask(two_tower_model)
code: def __init__(self, two_tower: TwoTower) -> None:
      super().__init__()
      self.two_tower = two_tower
      self.loss_fn: nn.Module = nn.BCEWithLogitsLoss()
  
imports: from typing import Any, List, Mapping, Optional, OrderedDict, Tuple, Union
  import faiss
  import faiss.contrib.torch_utils
  import torch
  from torch import nn
  from torchrec.datasets.utils import Batch
  from torchrec.modules.embedding_modules import EmbeddingBagCollection
  from torchrec.modules.mlp import MLP
  from torchrec.sparse.jagged_tensor import KeyedJaggedTensor
label_desc: Use image node_id 1 to create a new TwoTowerTrainTask object from inherited base classes: nn with example: obj = TwoTowerTrainTask(two_tower)