code: def analyze_dataset_len(self, dataset):
      print("Number of sentences", len(dataset))
  
imports: import math
  from underthesea.dictionary import Dictionary
  from collections import Counter, defaultdict
  from underthesea.utils import logger
  from datetime import date, timedelta
  import pandas
label_desc: Use image node_id 12 for calling the UDAnalyzer obj's underlying member method code with example usage: obj.analyze_dataset_len(dataset) without return types