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 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,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(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=None,
  31                   included_subreddits=None):
  32
  33     return tfidf("/gscratch/comdata/output/reddit_ngrams/comment_authors.parquet",
  34                  outpath,
  35                  topN,
  36                  'author',
  37                  ['[deleted]','AutoModerator'],
  38                  included_subreddits=included_subreddits
  39                  )
  40
  41 def tfidf_terms(outpath='/gscratch/comdata/output/reddit_similarity/tfidf/comment_terms.parquet',
  42                 topN=None,
  43                 included_subreddits=None):
  44
  45     return tfidf("/gscratch/comdata/output/reddit_ngrams/comment_terms.parquet",
  46                  outpath,
  47                  topN,
  48                  'term',
  49                  [],
  50                  included_subreddits=included_subreddits
  51                  )
  52
  53 def tfidf_authors_weekly(outpath='/gscratch/comdata/output/reddit_similarity/tfidf_weekly/comment_authors.parquet',
  54                          topN=None,
  55                          included_subreddits=None):
  56
  57     return tfidf_weekly("/gscratch/comdata/output/reddit_ngrams/comment_authors.parquet",
  58                         outpath,
  59                         topN,
  60                         'author',
  61                         ['[deleted]','AutoModerator'],
  62                         included_subreddits=included_subreddits
  63                         )
  64
  65 def tfidf_terms_weekly(outpath='/gscratch/comdata/output/reddit_similarity/tfidf_weekly/comment_terms.parquet',
  66                        topN=None,
  67                        included_subreddits=None):
  68
  69
  70     return tfidf_weekly("/gscratch/comdata/output/reddit_ngrams/comment_terms.parquet",
  71                         outpath,
  72                         topN,
  73                         'term',
  74                         [],
  75                         included_subreddits=included_subreddits
  76                         )
  77
  78
  79 if __name__ == "__main__":
  80     fire.Fire({'authors':tfidf_authors,
  81                'terms':tfidf_terms,
  82                'authors_weekly':tfidf_authors_weekly,
  83                'terms_weekly':tfidf_terms_weekly})