code: def forward(
      self, kjt: KeyedJaggedTensor
  ) -> Tuple[torch.Tensor, Optional[Dict[str, JaggedTensor]]]:
      if self._return_remapped:
          ebc_out, remapped_ids_out = self._mc_ebc(kjt)
      else:
          ebc_out = self._mc_ebc(kjt)
          remapped_ids_out = None
      pred = torch.cat(
          [ebc_out[key] for key in ["feature_0", "feature_1"]],
          dim=1,
      )
      loss = pred.mean()
      return loss, remapped_ids_out
  
imports: import copy
  import unittest
  from typing import Dict, List, Optional, Tuple
  import torch
  import torch.nn
  from hypothesis import given, settings, strategies
  from torchrec.distributed.embeddingbag import ShardedEmbeddingBagCollection
  from torchrec.distributed.mc_embeddingbag import ManagedCollisionEmbeddingBagCollectionSharder, ShardedManagedCollisionEmbeddingBagCollection
  from torchrec.distributed.mc_modules import ShardedManagedCollisionCollection
  from torchrec.distributed.shard import _shard_modules
  from torchrec.distributed.sharding_plan import construct_module_sharding_plan, row_wise
  from torchrec.distributed.test_utils.multi_process import MultiProcessContext, MultiProcessTestBase
  from torchrec.distributed.types import ModuleSharder, ShardingEnv, ShardingPlan
  from torchrec.modules.embedding_configs import EmbeddingBagConfig
  from torchrec.modules.embedding_modules import EmbeddingBagCollection
  from torchrec.modules.mc_embedding_modules import ManagedCollisionEmbeddingBagCollection
  from torchrec.modules.mc_modules import DistanceLFU_EvictionPolicy, ManagedCollisionCollection, MCHManagedCollisionModule
  from torchrec.optim.apply_optimizer_in_backward import apply_optimizer_in_backward
  from torchrec.optim.rowwise_adagrad import RowWiseAdagrad
  from torchrec.sparse.jagged_tensor import JaggedTensor, KeyedJaggedTensor
  from torchrec.test_utils import skip_if_asan_class
label_desc: Use image node_id 2 for calling the SparseArch obj's underlying member method code with example usage: obj.forward(kjt) and returns: loss,  remapped_ids_out