profiling_time.ipynb

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     "text": [
      "CPU times: user 7.29 s, sys: 51.6 ms, total: 7.34 s\n",
      "Wall time: 7.34 s\n"
     ]
    }
   ],
   "source": [
    "%%time\n",
    "\n",
    "import gzip\n",
    "\n",
    "def compute_user_subreddit_ids():\n",
    "    user_ids = []\n",
    "    subreddit_ids = []\n",
    "    subreddit_to_id = {}\n",
    "    i = 0\n",
    "    with gzip.open('reddituserpostingbehavior.csv.gz', 'rb') as f:\n",
    "        for line in f:\n",
    "            this_line = line.decode(\"utf-8\")\n",
    "            for sr in this_line.rstrip().split(',')[1:]:\n",
    "                if sr not in subreddit_to_id:\n",
    "                    subreddit_to_id[sr] = len(subreddit_to_id)\n",
    "                user_ids.append(i)\n",
    "                subreddit_ids.append(subreddit_to_id[sr])\n",
    "            i += 1\n",
    "        return user_ids, subreddit_ids\n",
    "    \n",
    "user_ids, subreddit_ids = compute_user_subreddit_ids()"
   ]
  }
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