LFD Book Forum  

Go Back   LFD Book Forum > Course Discussions > Online LFD course > Homework 6

Reply
 
Thread Tools Display Modes
  #1  
Old 08-12-2012, 10:38 AM
rainbow rainbow is offline
Member
 
Join Date: Jul 2012
Posts: 41
Default Usage of test data in early stopping

The test data is used to measure the performance of the final hypothesis g* on new data. After you evaluate g* on the test data there is no going back, because the performance evaluation contaminates the test data from further training.

Given this, it seems strange to use the test data iteratively as in the early stopping method. Is this really test data or is it validation data (as in train + validation + test)?

edit: Ask because in the lecture the Professor says "test set".

Last edited by rainbow; 08-12-2012 at 10:48 AM. Reason: reviewed lecture 11
Reply With Quote
  #2  
Old 08-12-2012, 04:06 PM
yaser's Avatar
yaser yaser is offline
Caltech
 
Join Date: Aug 2009
Location: Pasadena, California, USA
Posts: 1,477
Default Re: Usage of test data in early stopping

Quote:
Originally Posted by rainbow View Post
The test data is used to measure the performance of the final hypothesis g* on new data. After you evaluate g* on the test data there is no going back, because the performance evaluation contaminates the test data from further training.

Given this, it seems strange to use the test data iteratively as in the early stopping method. Is this really test data or is it validation data (as in train + validation + test)?

edit: Ask because in the lecture the Professor says "test set".
You are right about the role of a test set, and this is indeed a validation set not a test set if a decision such as early stopping is made. As noted, when the decision is simple (single parameter such as when to stop), the contamination is minimal.
__________________
Where everyone thinks alike, no one thinks very much
Reply With Quote
  #3  
Old 08-13-2012, 10:06 AM
rainbow rainbow is offline
Member
 
Join Date: Jul 2012
Posts: 41
Default Re: Usage of test data in early stopping

Thanks. Your feedback in the forum is highly appreciated.
Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT -7. The time now is 03:53 PM.


Powered by vBulletin® Version 3.8.3
Copyright ©2000 - 2019, Jelsoft Enterprises Ltd.
The contents of this forum are to be used ONLY by readers of the Learning From Data book by Yaser S. Abu-Mostafa, Malik Magdon-Ismail, and Hsuan-Tien Lin, and participants in the Learning From Data MOOC by Yaser S. Abu-Mostafa. No part of these contents is to be communicated or made accessible to ANY other person or entity.