[jira] [Updated] (MADLIB-1002) Sessionization - Phase 3 (minimum time)

["Frank McQuillan (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/MADLIB-1002?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Frank McQuillan updated MADLIB-1002:
------------------------------------
    Fix Version/s:     (was: v2.0)

> Sessionization - Phase 3 (minimum time)
> ---------------------------------------
>
>                 Key: MADLIB-1002
>                 URL: https://issues.apache.org/jira/browse/MADLIB-1002
>             Project: Apache MADlib
>          Issue Type: New Feature
>          Components: Module: Utilities
>            Reporter: Frank McQuillan
>            Priority: Minor
>              Labels: gsoc2016, starter
>
> Story
> As a data scientist, I want to perform session reconstruction on my data set, so that I can prepare for input into other algorithms like path functions, or predictive analytics algorithms.
> This is a follow on to 
> https://issues.apache.org/jira/browse/MADLIB-909
> https://issues.apache.org/jira/browse/MADLIB-1001
> to add minimum time.
> Details 
> Add min time to the existing params:
> Proposed interface changes:
> {code}
> sessionize (
>    source_table,
>    output_table,
>    partition_expr,
>    order_expr,
>    time_stamp,
>    time_out,
>    min_time,   -- new
>    output_cols,
>    create_view 
>    )
> {code}
> where
> min_time (optional)
> Minimum delta time that must elapse for an event to be considered a valid event (default=0).  If an event happens in less than min_time since the last valid event, it does not get included in the current session and is dropped.   Same units as time_stamp.
> Implementation notes
> 1) Should be specified in the same units as the time_out parameter.   
> 2) Always compare against the last valid session event, not against one(s) that just got dropped.
> For an example of how min_time could work, see Aster Analytics sessionization function [1].
> References
> [1] Aster Analytics users guide, see "sessionize" function
> http://www.info.teradata.com/edownload.cfm?itemid=143450001
> http://www.info.teradata.com/templates/eSrchResults.cfm?txtpid=&txtrelno=&prodline=all&frmdt=&txtsrchstring=aster%20analytics&srtord=Desc&todt=&rdSort=Date
> https://www.youtube.com/watch?v=C760M9ttK9Q



--
This message was sent by Atlassian JIRA
(v6.4.14#64029)