class_docstr: simple model that do nothing in train_step.
class_docstr_tok: ["simple","model","that","do","nothing","in","train_step","."]
code: def forward(self, inputs, data_samples, mode="tensor"):
      pass
  
imports: import argparse
  import json
  import os.path
  import re
  from pathlib import Path
  from unittest.mock import MagicMock
  import matplotlib.pyplot
  import rich
  import torch.nn
  from mmengine.config import Config, DictAction
  from mmengine.hooks import Hook
  from mmengine.model import BaseModel
  from mmengine.registry import init_default_scope
  from mmengine.runner import Runner
  from mmengine.visualization import Visualizer
  from rich.progress import BarColumn, MofNCompleteColumn, Progress, TextColumn
  from mmocr.registry import DATASETS
label_desc: Use image node_id 2 for calling the SimpleModel obj's underlying member method code with example usage: obj.forward(inputs, data_samples, mode) without return types