code: def gpt2_1558M():
      cfg = gpt2_124M()
      cfg.defrost()
      cfg.MODEL.num_heads = 25
      cfg.MODEL.num_layers = 48
      cfg.MODEL.units = 1600
      cfg.freeze()
      return cfg
  
imports: import os
  from typing import Tuple
  import mxnet
  from mxnet import use_np, np, npx
  from mxnet.gluon import HybridBlock, nn
  from .base import BACKBONE_REGISTRY
  from ..base import get_model_zoo_home_dir, get_repo_model_zoo_url, get_model_zoo_checksum_dir
  from ..utils.config import CfgNode
  from ..utils.misc import load_checksum_stats, download
  from ..utils.registry import Registry
  from ..initializer import TruncNorm
  from ..attention_cell import MultiHeadAttentionCell
  from ..layers import get_activation, PositionalEmbedding
  from ..data.tokenizers import HuggingFaceByteBPETokenizer
label_desc: Use image node_id 4 for calling a global function with example usage: gpt2_1558M() and returns: cfg