add README

README.md

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+# Reddit (Title, Body)-Pairs
+
+This dataset contains jsonl-Files about (title, body) pairs from Reddit. Each line is a JSON object of the following format:
+```
+{'title': 'The title of a thread', 'body': 'The longer body of the thread', 'subreddit': 'subreddit_name'}
+```
+
+The 2021 file contains submissions up until including 2021-06. Entries in the respective files are shuffled on a monthly basis.
+
+The data has been filtered for:
+- Remove threads with an upvote_ratio < 0.5
+- Only include threads with a title more than 25 characters and bodies with `len(title)+25 < len(body) < 4096`
+- Only keep threads with at least 3 comments or at least 3 upvotes.
+
+
+
+## Overview
+
+| File | Lines |
+| --- | :---: |
+| reddit_title_text_2010.jsonl.gz | 431,782
+| reddit_title_text_2011.jsonl.gz | 1,673,264
+| reddit_title_text_2012.jsonl.gz | 3,727,526
+| reddit_title_text_2013.jsonl.gz | 5,713,956
+| reddit_title_text_2014.jsonl.gz | 85,38,976
+| reddit_title_text_2015.jsonl.gz | 11,064,453
+| reddit_title_text_2016.jsonl.gz | 12,224,789
+| reddit_title_text_2017.jsonl.gz | 13,558,139
+| reddit_title_text_2018.jsonl.gz | 15,552,110
+| reddit_title_text_2019.jsonl.gz | 19,224,970
+| reddit_title_text_2020.jsonl.gz | 23,030,988
+| reddit_title_text_2021.jsonl.gz | 12,704,958
+
+
+Note: The data comes from [Pushshift](https://files.pushshift.io/reddit/). Please have a look at the respective license of Reddit and Pushshift before using the data.
+
+Be aware that this dataset is not filtered for biases, hate-speech, spam, racial slurm etc. It depicts the content as it is posted on Reddit.

extraction_script/extract_title_selftext.py

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+import json
+import gzip
+import sys
+import re
+import tqdm
+from collections import defaultdict
+import logging
+
+
+
+def clean_text(text):
+    text = text.strip()
+    text = re.sub(r'\[(.*)\]\(.*\)', '\g<1>', text) #Markdown
+    text = re.sub(r'http[s]?://(?:[a-zA-Z]|[0-9]|[$-_@.&+]|[!*\(\),]|(?:%[0-9a-fA-F][0-9a-fA-F]))+', '', text) # URLs
+    return text
+
+
+for line in tqdm.tqdm(sys.stdin):
+    try:
+        data = json.loads(line)
+        if 'title' in data and 'selftext' in data and 'num_comments' in data:
+            title = clean_text(data['title'])
+            selftext = clean_text(data['selftext'])
+            num_comments = data['num_comments']
+            score = data['score']
+            subreddit = data['subreddit'] if 'subreddit' in data else ''
+
+            if 'upvote_ratio' in data and float(data['upvote_ratio']) < 0.5:
+                continue
+                
+            
+            
+            if len(title) > 25 and len(title)+25 < len(selftext) < 4096 and (score >= 3 or num_comments >= 3):
+                print(json.dumps({'title': title, 'body': selftext, 'subreddit': subreddit}))
+                
+
+                    
+    except:
+        logging.warning("exception")

extraction_script/parse_files.py

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+import sys
+import os
+import random
+print("#!/bin/sh")
+filepaths = sys.argv[1:]
+random.shuffle(filepaths)
+for filepath in filepaths:
+    filename = os.path.basename(filepath)
+    year = filename[3:7]
+    
+    cmd = f"zstdcat --long=31 {filepath} | python extract_title_selftext.py | gzip >> submissions_parsed/reddit_title_text_{year}.jsonl.gz"
+    
+    print(cmd)
+    os.system(cmd)
+