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 = list(open(included_subreddits))
  15     else:
  16         include_subs = select_topN_subreddits(topN)
  17
  18     dfwriter = func(df, include_subs, term_colname)
  19
  20     dfwriter.parquet(outpath,mode='overwrite',compression='snappy')
  21     spark.stop()
  22
  23 def tfidf(inpath, outpath, topN, term_colname, exclude, included_subreddits):
  24     return _tfidf_wrapper(build_tfidf_dataset, inpath, outpath, topN, term_colname, exclude, included_subreddits)
  25
  26 def tfidf_weekly(inpath, outpath, topN, term_colname, exclude, included_subreddits):
  27     return _tfidf_wrapper(build_weekly_tfidf_dataset, inpath, outpath, topN, term_colname, exclude, included_subreddits)
  28
  29 def tfidf_authors(outpath='/gscratch/comdata/output/reddit_similarity/tfidf/comment_authors.parquet',
  30                   topN=25000):
  31
  32     return tfidf("/gscratch/comdata/output/reddit_ngrams/comment_authors.parquet",
  33                  outpath,
  34                  topN,
  35                  'author',
  36                  ['[deleted]','AutoModerator'],
  37                  included_subreddits=None
  38                  )
  39
  40 def tfidf_terms(outpath='/gscratch/comdata/output/reddit_similarity/tfidf/comment_terms.parquet',
  41                 topN=25000):
  42
  43     return tfidf("/gscratch/comdata/output/reddit_ngrams/comment_terms.parquet",
  44                  outpath,
  45                  topN,
  46                  'term',
  47                  [],
  48                  included_subreddits=None
  49                  )
  50
  51 def tfidf_authors_weekly(outpath='/gscratch/comdata/output/reddit_similarity/tfidf_weekly/comment_authors.parquet',
  52                          topN=25000):
  53
  54     return tfidf_weekly("/gscratch/comdata/output/reddit_ngrams/comment_authors.parquet",
  55                         outpath,
  56                         topN,
  57                         'author',
  58                         ['[deleted]','AutoModerator'],
  59                         included_subreddits=None
  60                         )
  61
  62 def tfidf_terms_weekly(outpath='/gscratch/comdata/output/reddit_similarity/tfidf_weekly/comment_terms.parquet',
  63                        topN=25000):
  64
  65
  66     return tfidf_weekly("/gscratch/comdata/output/reddit_ngrams/comment_terms.parquet",
  67                         outpath,
  68                         topN,
  69                         'term',
  70                         [],
  71                         included_subreddits=None
  72                         )
  73
  74
  75 if __name__ == "__main__":
  76     fire.Fire({'authors':tfidf_authors,
  77                'terms':tfidf_terms,
  78                'authors_weekly':tfidf_authors_weekly,
  79                'terms_weekly':tfidf_terms_weekly})