code: def rampup_batch_size_schedule():
      return [4, 8, 12, 16]
  
file_path: NeMo/tests/collections/nlp/test_rampup_batch_size.py
imports: import os
  import pytest
  import torch
  from omegaconf import DictConfig
  from pytorch_lightning import Trainer
  from nemo.collections.nlp.models.language_modeling.megatron_gpt_model import MegatronGPTModel
  from nemo.collections.nlp.parts.nlp_overrides import NLPDDPStrategy
label_desc: Use image node_id 6 for calling a global function with example usage: rampup_batch_size_schedule() and returns: list