Help me understand

留言板 : SETI@home Science : Help me understand
留言板合理

To post messages, you must log in.

作者消息
rob smith Crowdfunding Project Donor*Special Project $75 donorSpecial Project $250 donor
志愿者负责人
志愿者测试人员

发送消息
已加入:7 Mar 03
贴子:18822
积分:416,307,556
近期平均积分:380
United Kingdom
消息 2043517 - 发表于:7 Apr 2020, 15:12:59 UTC

To get a better understanding of what is being done, and what the problems with the data (both in terms of size and complexity) it is well worth reading through David Anderson's posts about Nebula:
https://setiathome.berkeley.edu/forum_forum.php?id=1511
Bob Smith
Member of Seti PIPPS (Pluto is a Planet Protest Society)
Somewhere in the (un)known Universe?
ID: 2043517 · 举报违规帖子     回复 引用
Profile Tom M
志愿者测试人员

发送消息
已加入:28 Nov 02
贴子:4994
积分:276,046,078
近期平均积分:462
消息 2043507 - 发表于:7 Apr 2020, 13:57:42 UTC - 回复消息 2042885.  

Take Sky. Divide into pixels. Store data from each observation, frequency, type, strength, polarization, and others in the pixel.

Question what pixel had repeated signal.

Answer, sort, sort, sort, sort.

Unfortunately sorting can only be done on data that isn't changing. Hence they have to stop filling the many many terabyte size database. Also consider just how huge the indices are going to be and how long it is going to take to build them. Unfortunately this isn't a problem that can be broken down and sent out to many processors, it is a linear problem.


It is very common to create what is called a "snap shot" of the operational DB that is then used for data analysis. This, in theory, could allow the volunteers to continue to pileup data.

I am presuming that is technically feasible. I am also presuming that the time the staff spends keeping Seti@Home volunteers running reduces the amount of time spent on thinking/pondering/imagineering about the data analysis step.

While I miss being able to process S@H data I also would very much like to "see" if there are any Seti signals hidden in the observations we have processed.

Tom
A proud member of the OFA (Old Farts Association).
ID: 2043507 · 举报违规帖子     回复 引用
Profile Gary Charpentier Crowdfunding Project Donor*Special Project $75 donorSpecial Project $250 donor
志愿者测试人员
Avatar

发送消息
已加入:25 Dec 00
贴子:27236
积分:53,134,872
近期平均积分:32
United States
消息 2042885 - 发表于:4 Apr 2020, 3:51:57 UTC

Take Sky. Divide into pixels. Store data from each observation, frequency, type, strength, polarization, and others in the pixel.

Question what pixel had repeated signal.

Answer, sort, sort, sort, sort.

Unfortunately sorting can only be done on data that isn't changing. Hence they have to stop filling the many many terabyte size database. Also consider just how huge the indices are going to be and how long it is going to take to build them. Unfortunately this isn't a problem that can be broken down and sent out to many processors, it is a linear problem.
ID: 2042885 · 举报违规帖子     回复 引用
Profile William Rothamel
Avatar

发送消息
已加入:25 Oct 06
贴子:3625
积分:1,999,735
近期平均积分:4
United States
消息 2042852 - 发表于:4 Apr 2020, 0:00:33 UTC - 回复消息 2042815.  

They were not analyzing any data--just stockpiling it. Not clear if there were any computations deciding what to keep--or whether tor not it was an effective culling. if they cannot answer this to we unsophisticated proles then They deserve to go out of business.
.
ID: 2042852 · 举报违规帖子     回复 引用
Bobby

发送消息
已加入:25 Dec 07
贴子:3
积分:6,190,904
近期平均积分:35
United States
消息 2042815 - 发表于:3 Apr 2020, 20:32:08 UTC

Myself along with other I've spoken to do hope you reconsider your plans on stopping this project.

Let the data pile up until there is a more effective way to sort it. Machine learning, AI, advanced scripts, etc.
Is it other reasons?

I never thought that this Seti@home would accept the idea of giving up because its too much.
ID: 2042815 · 举报违规帖子     回复 引用

留言板 : SETI@home Science : Help me understand


 
©2020 University of California
 
SETI@home and Astropulse are funded by grants from the National Science Foundation, NASA, and donations from SETI@home volunteers. AstroPulse is funded in part by the NSF through grant AST-0307956.