code: def test_avgdl_from_dictionary(self):
      model = BM25Stub(dictionary=self.dictionary)
      actual_avgdl = model.avgdl
      self.assertAlmostEqual(self.expected_avgdl, actual_avgdl)
  
imports: from collections import defaultdict
  import math
  import unittest
  from gensim.models.bm25model import BM25ABC
  from gensim.models import OkapiBM25Model, LuceneBM25Model, AtireBM25Model
  from gensim.corpora import Dictionary
label_desc: Use image node_id 3 for calling the BM25ABCTest obj's underlying member method code with example usage: obj.test_avgdl_from_dictionary() without return types