code: def merge_eval(main_eval, new_eval, prefix):
      """Merges 2 evaluation dictionaries into the first one by adding prefix as key for name collision handling"""
      for k in new_eval:
          main_eval["%s_%s" % (prefix, k)] = new_eval[k]
  
imports: import collections
  from typing import List
  import ijson
  import numpy
  from transformers.models.bert.tokenization_bert import BasicTokenizer
  from nemo.collections.nlp.data.data_utils import DataProcessor, check_chinese_char, normalize_answer, normalize_chinese_answer
  from nemo.utils import logging
label_desc: Use image node_id 8 for calling a global function with example usage: merge_eval(main_eval, new_eval, prefix) without return types