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{
"cells": [
{
"cell_type": "markdown",
"metadata": {},
"source": [
"# Sessionize\n",
"\n",
"The MADlib sessionize function performs time-oriented session reconstruction on a data set comprising a sequence of events. A defined period of inactivity indicates the end of one session and beginning of the next session."
]
},
{
"cell_type": "code",
"execution_count": 6,
"metadata": {
"collapsed": false
},
"outputs": [
{
"name": "stdout",
"output_type": "stream",
"text": [
"The sql extension is already loaded. To reload it, use:\n",
" %reload_ext sql\n"
]
}
],
"source": [
"%load_ext sql"
]
},
{
"cell_type": "code",
"execution_count": 7,
"metadata": {
"collapsed": false
},
"outputs": [
{
"data": {
"text/plain": [
"u'Connected: fmcquillan@madlib'"
]
},
"execution_count": 7,
"metadata": {},
"output_type": "execute_result"
}
],
"source": [
"# %sql postgresql://gpdbchina@10.194.10.68:55000/madlib\n",
"%sql postgresql://fmcquillan@localhost:5432/madlib"
]
},
{
"cell_type": "code",
"execution_count": 8,
"metadata": {
"collapsed": false,
"scrolled": true
},
"outputs": [
{
"name": "stdout",
"output_type": "stream",
"text": [
"1 rows affected.\n"
]
},
{
"data": {
"text/html": [
"<table>\n",
" <tr>\n",
" <th>version</th>\n",
" </tr>\n",
" <tr>\n",
" <td>MADlib version: 1.9.1, git revision: rc/v1.9-rc1-39-g1929aed, cmake configuration time: Tue Aug 30 00:17:02 UTC 2016, build type: RelWithDebInfo, build system: Darwin-14.5.0, C compiler: Clang, C++ compiler: Clang</td>\n",
" </tr>\n",
"</table>"
],
"text/plain": [
"[(u'MADlib version: 1.9.1, git revision: rc/v1.9-rc1-39-g1929aed, cmake configuration time: Tue Aug 30 00:17:02 UTC 2016, build type: RelWithDebInfo, build system: Darwin-14.5.0, C compiler: Clang, C++ compiler: Clang',)]"
]
},
"execution_count": 8,
"metadata": {},
"output_type": "execute_result"
}
],
"source": [
"%sql select madlib.version();"
]
},
{
"cell_type": "markdown",
"metadata": {
"collapsed": true
},
"source": [
"The data set describes shopper behavior on a notional web site that sells beer and wine. A beacon fires an event to a log file when the shopper visits different pages on the site: landing page, beer selection page, wine selection page, and checkout. Each user is identified by a a user id, and every time a page is visited, the page and time stamp are logged.\n",
"\n",
"Create the data table:"
]
},
{
"cell_type": "code",
"execution_count": 9,
"metadata": {
"collapsed": false
},
"outputs": [
{
"name": "stdout",
"output_type": "stream",
"text": [
"Done.\n",
"Done.\n",
"21 rows affected.\n",
"21 rows affected.\n"
]
},
{
"data": {
"text/html": [
"<table>\n",
" <tr>\n",
" <th>event_timestamp</th>\n",
" <th>user_id</th>\n",
" <th>page</th>\n",
" <th>revenue</th>\n",
" </tr>\n",
" <tr>\n",
" <td>2015-04-15 01:03:00</td>\n",
" <td>100821</td>\n",
" <td>LANDING</td>\n",
" <td>0.0</td>\n",
" </tr>\n",
" <tr>\n",
" <td>2015-04-15 01:04:00</td>\n",
" <td>100821</td>\n",
" <td>WINE</td>\n",
" <td>0.0</td>\n",
" </tr>\n",
" <tr>\n",
" <td>2015-04-15 01:05:00</td>\n",
" <td>202201</td>\n",
" <td>LANDING</td>\n",
" <td>0.0</td>\n",
" </tr>\n",
" <tr>\n",
" <td>2015-04-15 01:05:00</td>\n",
" <td>100821</td>\n",
" <td>CHECKOUT</td>\n",
" <td>39.0</td>\n",
" </tr>\n",
" <tr>\n",
" <td>2015-04-15 01:06:00</td>\n",
" <td>202201</td>\n",
" <td>HELP</td>\n",
" <td>0.0</td>\n",
" </tr>\n",
" <tr>\n",
" <td>2015-04-15 01:09:00</td>\n",
" <td>202201</td>\n",
" <td>LANDING</td>\n",
" <td>0.0</td>\n",
" </tr>\n",
" <tr>\n",
" <td>2015-04-15 02:06:00</td>\n",
" <td>100821</td>\n",
" <td>WINE</td>\n",
" <td>0.0</td>\n",
" </tr>\n",
" <tr>\n",
" <td>2015-04-15 02:09:00</td>\n",
" <td>100821</td>\n",
" <td>WINE</td>\n",
" <td>0.0</td>\n",
" </tr>\n",
" <tr>\n",
" <td>2015-04-15 02:15:00</td>\n",
" <td>101331</td>\n",
" <td>LANDING</td>\n",
" <td>0.0</td>\n",
" </tr>\n",
" <tr>\n",
" <td>2015-04-15 02:15:00</td>\n",
" <td>202201</td>\n",
" <td>WINE</td>\n",
" <td>0.0</td>\n",
" </tr>\n",
" <tr>\n",
" <td>2015-04-15 02:16:00</td>\n",
" <td>101331</td>\n",
" <td>WINE</td>\n",
" <td>0.0</td>\n",
" </tr>\n",
" <tr>\n",
" <td>2015-04-15 02:16:00</td>\n",
" <td>202201</td>\n",
" <td>BEER</td>\n",
" <td>0.0</td>\n",
" </tr>\n",
" <tr>\n",
" <td>2015-04-15 02:17:00</td>\n",
" <td>202201</td>\n",
" <td>WINE</td>\n",
" <td>0.0</td>\n",
" </tr>\n",
" <tr>\n",
" <td>2015-04-15 02:17:00</td>\n",
" <td>101331</td>\n",
" <td>HELP</td>\n",
" <td>0.0</td>\n",
" </tr>\n",
" <tr>\n",
" <td>2015-04-15 02:18:00</td>\n",
" <td>101331</td>\n",
" <td>WINE</td>\n",
" <td>0.0</td>\n",
" </tr>\n",
" <tr>\n",
" <td>2015-04-15 02:19:00</td>\n",
" <td>101331</td>\n",
" <td>CHECKOUT</td>\n",
" <td>16.0</td>\n",
" </tr>\n",
" <tr>\n",
" <td>2015-04-15 02:29:00</td>\n",
" <td>201881</td>\n",
" <td>LANDING</td>\n",
" <td>0.0</td>\n",
" </tr>\n",
" <tr>\n",
" <td>2015-04-15 02:30:00</td>\n",
" <td>201881</td>\n",
" <td>BEER</td>\n",
" <td>0.0</td>\n",
" </tr>\n",
" <tr>\n",
" <td>2015-04-15 03:18:00</td>\n",
" <td>202201</td>\n",
" <td>BEER</td>\n",
" <td>0.0</td>\n",
" </tr>\n",
" <tr>\n",
" <td>2015-04-15 03:19:00</td>\n",
" <td>202201</td>\n",
" <td>WINE</td>\n",
" <td>0.0</td>\n",
" </tr>\n",
" <tr>\n",
" <td>2015-04-15 03:22:00</td>\n",
" <td>202201</td>\n",
" <td>CHECKOUT</td>\n",
" <td>21.0</td>\n",
" </tr>\n",
"</table>"
],
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"[(datetime.datetime(2015, 4, 15, 1, 3), 100821, u'LANDING', 0.0),\n",
" (datetime.datetime(2015, 4, 15, 1, 4), 100821, u'WINE', 0.0),\n",
" (datetime.datetime(2015, 4, 15, 1, 5), 202201, u'LANDING', 0.0),\n",
" (datetime.datetime(2015, 4, 15, 1, 5), 100821, u'CHECKOUT', 39.0),\n",
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" (datetime.datetime(2015, 4, 15, 2, 17), 101331, u'HELP', 0.0),\n",
" (datetime.datetime(2015, 4, 15, 2, 18), 101331, u'WINE', 0.0),\n",
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]
},
"execution_count": 9,
"metadata": {},
"output_type": "execute_result"
}
],
"source": [
"%%sql \n",
"DROP TABLE IF EXISTS eventlog CASCADE; -- Use CASCADE because views created below depend on this table\n",
"\n",
"CREATE TABLE eventlog (event_timestamp TIMESTAMP,\n",
" user_id INT,\n",
" page TEXT,\n",
" revenue FLOAT);\n",
"\n",
"INSERT INTO eventlog VALUES\n",
"('04/15/2015 02:19:00', 101331, 'CHECKOUT', 16),\n",
"('04/15/2015 02:17:00', 202201, 'WINE', 0),\n",
"('04/15/2015 03:18:00', 202201, 'BEER', 0),\n",
"('04/15/2015 01:03:00', 100821, 'LANDING', 0),\n",
"('04/15/2015 01:04:00', 100821, 'WINE', 0),\n",
"('04/15/2015 01:05:00', 100821, 'CHECKOUT', 39),\n",
"('04/15/2015 02:06:00', 100821, 'WINE', 0),\n",
"('04/15/2015 02:09:00', 100821, 'WINE', 0),\n",
"('04/15/2015 02:15:00', 101331, 'LANDING', 0),\n",
"('04/15/2015 02:16:00', 101331, 'WINE', 0),\n",
"('04/15/2015 02:17:00', 101331, 'HELP', 0),\n",
"('04/15/2015 02:18:00', 101331, 'WINE', 0),\n",
"('04/15/2015 02:29:00', 201881, 'LANDING', 0),\n",
"('04/15/2015 02:30:00', 201881, 'BEER', 0),\n",
"('04/15/2015 01:05:00', 202201, 'LANDING', 0),\n",
"('04/15/2015 01:06:00', 202201, 'HELP', 0),\n",
"('04/15/2015 01:09:00', 202201, 'LANDING', 0),\n",
"('04/15/2015 02:15:00', 202201, 'WINE', 0),\n",
"('04/15/2015 02:16:00', 202201, 'BEER', 0),\n",
"('04/15/2015 03:19:00', 202201, 'WINE', 0),\n",
"('04/15/2015 03:22:00', 202201, 'CHECKOUT', 21);\n",
"\n",
"SELECT * FROM eventlog ORDER BY event_timestamp;\n"
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"Sessionize the table by each user_id:"
]
},
{
"cell_type": "code",
"execution_count": 10,
"metadata": {
"collapsed": false
},
"outputs": [
{
"name": "stdout",
"output_type": "stream",
"text": [
"Done.\n",
"1 rows affected.\n",
"21 rows affected.\n"
]
},
{
"data": {
"text/html": [
"<table>\n",
" <tr>\n",
" <th>event_timestamp</th>\n",
" <th>user_id</th>\n",
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" <th>session_id</th>\n",
" </tr>\n",
" <tr>\n",
" <td>2015-04-15 01:03:00</td>\n",
" <td>100821</td>\n",
" <td>LANDING</td>\n",
" <td>0.0</td>\n",
" <td>1</td>\n",
" </tr>\n",
" <tr>\n",
" <td>2015-04-15 01:04:00</td>\n",
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" <td>2015-04-15 01:05:00</td>\n",
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" <td>2015-04-15 02:09:00</td>\n",
" <td>100821</td>\n",
" <td>WINE</td>\n",
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" <td>2</td>\n",
" </tr>\n",
" <tr>\n",
" <td>2015-04-15 02:15:00</td>\n",
" <td>101331</td>\n",
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" <td>1</td>\n",
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" <tr>\n",
" <td>2015-04-15 02:16:00</td>\n",
" <td>101331</td>\n",
" <td>WINE</td>\n",
" <td>0.0</td>\n",
" <td>1</td>\n",
" </tr>\n",
" <tr>\n",
" <td>2015-04-15 02:17:00</td>\n",
" <td>101331</td>\n",
" <td>HELP</td>\n",
" <td>0.0</td>\n",
" <td>1</td>\n",
" </tr>\n",
" <tr>\n",
" <td>2015-04-15 02:18:00</td>\n",
" <td>101331</td>\n",
" <td>WINE</td>\n",
" <td>0.0</td>\n",
" <td>1</td>\n",
" </tr>\n",
" <tr>\n",
" <td>2015-04-15 02:19:00</td>\n",
" <td>101331</td>\n",
" <td>CHECKOUT</td>\n",
" <td>16.0</td>\n",
" <td>1</td>\n",
" </tr>\n",
" <tr>\n",
" <td>2015-04-15 02:29:00</td>\n",
" <td>201881</td>\n",
" <td>LANDING</td>\n",
" <td>0.0</td>\n",
" <td>1</td>\n",
" </tr>\n",
" <tr>\n",
" <td>2015-04-15 02:30:00</td>\n",
" <td>201881</td>\n",
" <td>BEER</td>\n",
" <td>0.0</td>\n",
" <td>1</td>\n",
" </tr>\n",
" <tr>\n",
" <td>2015-04-15 01:05:00</td>\n",
" <td>202201</td>\n",
" <td>LANDING</td>\n",
" <td>0.0</td>\n",
" <td>1</td>\n",
" </tr>\n",
" <tr>\n",
" <td>2015-04-15 01:06:00</td>\n",
" <td>202201</td>\n",
" <td>HELP</td>\n",
" <td>0.0</td>\n",
" <td>1</td>\n",
" </tr>\n",
" <tr>\n",
" <td>2015-04-15 01:09:00</td>\n",
" <td>202201</td>\n",
" <td>LANDING</td>\n",
" <td>0.0</td>\n",
" <td>1</td>\n",
" </tr>\n",
" <tr>\n",
" <td>2015-04-15 02:15:00</td>\n",
" <td>202201</td>\n",
" <td>WINE</td>\n",
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" <td>2</td>\n",
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" <td>2015-04-15 02:16:00</td>\n",
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" <td>2</td>\n",
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" <td>3</td>\n",
" </tr>\n",
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" <td>2015-04-15 03:19:00</td>\n",
" <td>202201</td>\n",
" <td>WINE</td>\n",
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" <td>3</td>\n",
" </tr>\n",
" <tr>\n",
" <td>2015-04-15 03:22:00</td>\n",
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" <td>CHECKOUT</td>\n",
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" </tr>\n",
"</table>"
],
"text/plain": [
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]
},
"execution_count": 10,
"metadata": {},
"output_type": "execute_result"
}
],
"source": [
"%%sql\n",
"DROP VIEW IF EXISTS sessionize_output_view;\n",
"\n",
" SELECT madlib.sessionize(\n",
" 'eventlog', -- Name of input table\n",
" 'sessionize_output_view', -- View to store sessionize results\n",
" 'user_id', -- Partition input table by user id\n",
" 'event_timestamp', -- Time column used to compute sessions\n",
" '0:30:0' -- Time out used to define a session (30 minutes)\n",
" );\n",
" \n",
"SELECT * FROM sessionize_output_view ORDER BY user_id, event_timestamp;"
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"Now let's say we want to see 3 minute sessions by a group of users with a certain range of user IDs. To do this, we need to sessionize the table based on a partition expression. Also, we want to persist a table output with a reduced set of columns in the table."
]
},
{
"cell_type": "code",
"execution_count": null,
"metadata": {
"collapsed": false
},
"outputs": [],
"source": [
"%%sql\n",
"DROP TABLE IF EXISTS sessionize_output_table;\n",
"\n",
" SELECT madlib.sessionize(\n",
" 'eventlog', -- Name of input table\n",
" 'sessionize_output_table', -- Table to store sessionize results\n",
" 'user_id < 200000', -- Partition input table by subset of users\n",
" 'event_timestamp', -- Order partitions in input table by time\n",
" '180', -- Use 180 second time out to define sessions\n",
" -- Note that this is the same as '0:03:0'\n",
" 'event_timestamp, user_id, user_id < 200000 AS \"Department-A1\"', -- Select only user_id and event_timestamp columns, along with the session id as output\n",
" 'f' -- create a table\n",
" );\n",
" \n",
" SELECT * FROM sessionize_output_table WHERE \"Department-A1\"='TRUE' ORDER BY event_timestamp;"
]
},
{
"cell_type": "code",
"execution_count": null,
"metadata": {
"collapsed": true
},
"outputs": [],
"source": []
}
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