code: def sanitize_layer_name(layer):
      new_name = layer["name"]
      if new_name[0].isdigit():
          new_name = layer["class_name"].lower() + new_name
  
      layer["name"] = new_name
  
imports: import numpy
  import onnx
  from onnx import helper, numpy_helper, shape_inference
  from hls4ml.model import ModelGraph
label_desc: Use image node_id 1 for calling a global function with example usage: sanitize_layer_name(layer) without return types