code: def test_step(self, batch: Any, batch_idx: int) -> Any:
      raise NotImplementedError(
          "Testing an `Embedder` is not supported."
      )
  
imports: from typing import Any, Optional
  from pytorch_lightning import LightningModule
  from torch.utils.data import DataLoader, Sampler
  import flash
  from flash.core.data.io.input import InputBase
  from flash.core.data.io.input_transform import InputTransform
  from flash.core.model import Task
label_desc: Use image node_id 8 for calling the Embedder obj's underlying member method code with example usage: obj.test_step(batch, batch_idx) without return types