code: def __getitem__(self, idx):
      return torch.tensor([0.5, 1.0, 2.0])
  
imports: import torch
  from lightning.pytorch.core.module import LightningModule
  from torch import Tensor, nn
  from torch.utils.data import DataLoader, Dataset
label_desc: Use image node_id 2 for calling the DummyDataset obj's underlying member method code with example usage: obj.__getitem__(idx) and returns: torch