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Distributed Information Systems

Computational Elements Within The Exam
My question regards how the computational questions will be approached in the exam.

If the only allowed materials are the notes, exercises, etc, then are we to not expect any complex computations? For instance, computing information gain for decision requires a fairly insignificant logrithmic computation, computation of broadcast disk frequencies/LIX values may be nontrivial, inverted document frequency, etc...
Posted by Nathan Evans at 14:17
Comments (2)
LIX caching
I have a doubt concerning the "broadcast disks and caching" exercise. In question 2, for the LIX part, you are updating the running access probabilities for each page whenever the page appears in the broadcast: p1 is updated at time 1, p2 at time 2, p3 at time 3, p1 at time 4, etc.
In the lecture, however, it is said that the value is updated only when the data item is consumed by the application. This is also shown in the example of slide 25. If we follow this example, we should update p1 at time 1, nobody at time 2, p3 at time 3, etc.
Which convention is the right one?
Thanks a lot.
Posted by Ghid Maatouk at 20:01
Comments (3)
Past year(s) Final exam(s)
please is it possible to upload in the website a past year final exam for preparation.
Posted by Hever Patrick Ngallemo at 10:25
Comments (3)
Final Examination Breakdown
Hello there.

I'm wondering more specifically how the midterm grades are factored into the final examination. I guess it also has to do with the structure of the final exam. The course website says:

"We will have two written intermediate bonus exams, which each count 25%. An intermediate exam counts only if the grade is better than the grade in the final exam."

The thing that confuses me slightly mathematical. If 2/3rds of the information of the class was covered by the midterm exams, why are the each worth 25% of the final grade? Will the final examination include 3 equally-sized parts including questions from material covered in the 1st exam, 2nd exam, and then that information covered afterward? Is the information covered after the two exams worth 2 times as much?

I'm mostly asking as a product of what to study. Imagine that you obtained a perfect grade for one of the midterms and thus there is no way to get a better note on the final for the corresponding information. Does this mean one can avoid studying for this particular information and skip over a section of the final exam? If so, I suppose I don't understand how the replacement works exactly.

Thanks for any clarifications.
Posted by Nathan Evans at 16:08
Comments (2)
Q & A session for the DIS final exam
To help student better prepare the final exam, there'll be one Q&A session in January 2008.

Date: 16h00-18h00, Jan 17th 2008.
Location: BC03.

Follow-up questions and discussion can be posted here.
Posted by Le Hung Vu at 16:33
DIS 2007-2008 -first entry
This blog is created as an open discussion place among students and assistants on related issues of the DIS course.

All EPFL students can read and post comments on this blog (need GASPAR credentials).

Class URL: http://lsirwww.epfl.ch/courses/dis/2007ws/index.htm

Also note that from the main site, you can go back to all teaching materials, including exercises and solutions of this course of previous years.
Posted by Le Hung Vu at 16:16