docstr: Get sentence count by doc url
docstr_tok: ["Get","sentence","count","by","doc","url"]
code: def analyze_doc_sent_freq(self, dataset):
      """Get sentence count by doc url"""
      data = self._get_doc_sents(dataset)
      print("Number of doc URLs %s" % len(data))
      doc_sent_counts = [
          (doc, len(sents)) for doc, sents in data.items()
      ]
      return doc_sent_counts
  
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 11 for calling the UDAnalyzer obj's underlying member method code with example usage: obj.analyze_doc_sent_freq(dataset) and returns: doc_sent_counts