class_docstr: Triples and mappings to their indices for LCWA.
class_docstr_tok: ["Triples","and","mappings","to","their","indices","for","LCWA","."]
code: def __getitem__(self, item: int) -> LCWABatchType:  # noqa: D105
      return (
          self.pairs[item],
          np.asarray(self.compressed[item, :].todense())[0, :],
      )
  
imports: import math
  from abc import ABC, abstractmethod
  from typing import Callable, Generic, Iterable, Iterator, List, NamedTuple, Optional, Tuple, TypeVar
  import numpy
  import scipy.sparse
  import torch
  from class_resolver import HintOrType, OptionalKwargs
  from torch.utils import data
  from .utils import compute_compressed_adjacency_list
  from ..sampling import NegativeSampler, negative_sampler_resolver
  from ..typing import MappedTriples
label_desc: Use image node_id 4 for calling the LCWAInstances obj's underlying member method code with example usage: obj.__getitem__(item) and returns: self,  np