code: def get_trainer(trainer_name):
      if trainer_name == "plainvit_trainer":
          return trainer.train
      else:
          raise ValueError(f"Unrecognized trainer: {trainer_name}.")
  
file_path: scenic/scenic/projects/baselines/plainvit/main.py
imports: from absl import flags
  from clu import metric_writers
  import jax
  import jax.numpy
  import ml_collections
  from scenic import app
  from scenic.projects.baselines.plainvit import plainvit
  from scenic.projects.baselines.plainvit import trainer
  from scenic.train_lib import train_utils
label_desc: Use image node_id 2 for calling a global function with example usage: get_trainer(trainer_name) and returns: trainer