code: def calculate_wer_count(_ins, _del, _sub, ref_word_count):
      return (_ins + _del + _sub) / ref_word_count
  
file_path: NeMo/tests/collections/asr/test_diar_metrics.py
imports: from itertools import permutations
  import pytest
  import torch
  from nemo.collections.asr.metrics.der import calculate_session_cpWER, calculate_session_cpWER_bruteforce, get_online_DER_stats, get_partial_ref_labels
label_desc: Use image node_id 2 for calling a global function with example usage: calculate_wer_count(_ins, _del, _sub, ref_word_count) and returns: unknown