code: def predict_step(
      self, batch, batch_idx: int, dataloader_idx: int = 0
  ):
      return self.backbone(batch)
  
file_path: lightning-flash/tests/core/utilities/test_embedder.py
imports: import time
  import pytest
  import torch
  from flash.core.utilities.embedder import Embedder
  from flash.core.utilities.imports import _TOPIC_CORE_AVAILABLE
  from pytorch_lightning import LightningModule
  from torch import nn
label_desc: Use image node_id 2 for calling the EmbedderTestModel obj's underlying member method code with example usage: obj.predict_step(batch, batch_idx, dataloader_idx) and returns: self