code: def test_train_dataloader(camvid_ds):
      train_ds, _ = camvid_ds
      dl = models.fastai.unet.dataloaders.train_dl(
          train_ds, batch_size=1, num_workers=0, shuffle=False
      )
  
      (x, y), records = first(dl)
      assert records[0].record_id == "0006R0_f02340"
  
      _test_dl(x, y, records)
  
imports: from icevision.all import *
label_desc: Use image node_id 2 for calling a global function with example usage: test_train_dataloader(camvid_ds) without return types