similarities/tfidf.py

   1 import fire
   2 from pyspark.sql import SparkSession
   3 from pyspark.sql import functions as f
   4 from similarities_helper import build_tfidf_dataset, build_weekly_tfidf_dataset, select_topN_subreddits
   5
   6 def _tfidf_wrapper(func, inpath, outpath, topN, term_colname, exclude, included_subreddits):
   7     spark = SparkSession.builder.getOrCreate()
   8
   9     df = spark.read.parquet(inpath)
  10
  11     df = df.filter(~ f.col(term_colname).isin(exclude))
  12
  13     if included_subreddits is not None:
  14         include_subs = set(map(str.strip,map(str.lower, open(included_subreddits))))
  15     else:
  16         include_subs = select_topN_subreddits(topN)
  17
  18     df = func(df, include_subs, term_colname)
  19
  20     df.write.parquet(outpath,mode='overwrite',copmression='snappy')
  21
  22     spark.stop()
  23
  24 def tfidf(inpath, outpath, topN, term_colname, exclude, included_subreddits):
  25     return _tfidf_wrapper(build_tfidf_dataset, inpath, outpath, topN, term_colname, exclude, included_subreddits)
  26
  27 def tfidf_weekly(inpath, outpath, topN, term_colname, exclude, included_subreddits):
  28     return _tfidf_wrapper(build_weekly_tfidf_dataset, inpath, outpath, topN, term_colname, exclude, included_subreddits)
  29
  30 def tfidf_authors(outpath='/gscratch/comdata/output/reddit_similarity/tfidf/comment_authors.parquet',
  31                   topN=25000,
  32                   included_subreddits=None):
  33
  34     return tfidf("/gscratch/comdata/output/reddit_ngrams/comment_authors.parquet",
  35                  outpath,
  36                  topN,
  37                  'author',
  38                  ['[deleted]','AutoModerator'],
  39                  included_subreddits=included_subreddits
  40                  )
  41
  42 def tfidf_terms(outpath='/gscratch/comdata/output/reddit_similarity/tfidf/comment_terms.parquet',
  43                 topN=25000,
  44                 included_subreddits=None):
  45
  46     return tfidf("/gscratch/comdata/output/reddit_ngrams/comment_terms.parquet",
  47                  outpath,
  48                  topN,
  49                  'term',
  50                  [],
  51                  included_subreddits=included_subreddits
  52                  )
  53
  54 def tfidf_authors_weekly(outpath='/gscratch/comdata/output/reddit_similarity/tfidf_weekly/comment_authors.parquet',
  55                          topN=25000,
  56                          included_subreddits=None):
  57
  58     return tfidf_weekly("/gscratch/comdata/output/reddit_ngrams/comment_authors.parquet",
  59                         outpath,
  60                         topN,
  61                         'author',
  62                         ['[deleted]','AutoModerator'],
  63                         included_subreddits=included_subreddits
  64                         )
  65
  66 def tfidf_terms_weekly(outpath='/gscratch/comdata/output/reddit_similarity/tfidf_weekly/comment_terms.parquet',
  67                        topN=25000,
  68                        included_subreddits=None):
  69
  70
  71     return tfidf_weekly("/gscratch/comdata/output/reddit_ngrams/comment_terms.parquet",
  72                         outpath,
  73                         topN,
  74                         'term',
  75                         [],
  76                         included_subreddits=included_subreddits
  77                         )
  78
  79
  80 if __name__ == "__main__":
  81     fire.Fire({'authors':tfidf_authors,
  82                'terms':tfidf_terms,
  83                'authors_weekly':tfidf_authors_weekly,
  84                'terms_weekly':tfidf_terms_weekly})