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Welcome to the Wiki page of the course Search Engines, WS 2009 / 2010. Lecturer: Hannah Bast. Tutorials: Marjan Celikik. Course web page: click here.

Here are PDFs of the slides of the lectures so far: Lecture 1, Lecture 2, Lecture 3, Lecture 4, Lecture 5.

Here are .lpd files of the recordings of the lectures so far (except Lecture 2, where we had problems with the microphone): Lecture 1 Lecture 3 Lecture 4.

Here are PDFs of the exercise sheets so far: Exercise Sheet 1, Exercise Sheet 2, Exercise Sheet 3, Exercise Sheet 4, Exercise Sheet 5.

Here are your solutions and comments on the previous exercise sheets: Solutions and Comments 1, Solutions and Comments 2, Solutions and Comments 3, Solutions and Comments 4.

Exercise Sheet 5

The recordings of all lectures are now available, see above. Lecture 2 is missing because we had technical problems there. To play the recordings (it's .lpd files) you need the Lecturnity Player. You can download the player for free here.

Here are the rules for the exercises as explained in Lecture 2.

Here you can upload your solutions for Exercise Sheet 5.

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-= Exercise Sheet 1 =
[[attachment:SearchEnginesWS0910/ExerciseSheet1/lecture-1.pdf|Here is a PDF of the slides of Lecture 1]].
+Here are PDFs of the slides of the lectures so far: [[attachment:SearchEnginesWS0910/lecture-1.pdf|Lecture 1]], [[attachment:SearchEnginesWS0910/lecture-2.pdf|Lecture 2]], [[attachment:SearchEnginesWS0910/lecture-3.pdf|Lecture 3]], [[attachment:SearchEnginesWS0910/lecture-4.pdf|Lecture 4]], [[attachment:SearchEnginesWS0910/lecture-5.pdf|Lecture 5]].
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-[[attachment:SearchEnginesWS0910/ExerciseSheet1/exercise-1.pdf|Here is a PDF of Exercise Sheet 1]].
+Here are .lpd files of the recordings of the lectures so far (except Lecture 2, where we had problems with the microphone): [[http://vulcano.informatik.uni-freiburg.de/lecturnity/lecture-1.lpd|Lecture 1]] [[http://vulcano.informatik.uni-freiburg.de/lecturnity/lecture-3.lpd|Lecture 3]] [[http://vulcano.informatik.uni-freiburg.de/lecturnity/lecture-4.lpd|Lecture 4]].
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-[[SearchEnginesWS0910/StudentIntros|Introduce yourself on this page please (Exercise 1)]].
+Here are PDFs of the exercise sheets so far: [[attachment:SearchEnginesWS0910/exercise-1.pdf|Exercise Sheet 1]], [[attachment:SearchEnginesWS0910/exercise-2.pdf|Exercise Sheet 2]], [[attachment:SearchEnginesWS0910/exercise-3.pdf|Exercise Sheet 3]], [[attachment:SearchEnginesWS0910/exercise-4.pdf|Exercise Sheet 4]], [[attachment:SearchEnginesWS0910/exercise-5.pdf|Exercise Sheet 5]].
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-[[SearchEnginesWS0910/ExerciseSheet1|Upload your results to Exercise Sheet 1 on this page please]].
+Here are your solutions and comments on the previous exercise sheets: [[SearchEnginesWS0910/ExerciseSheet1|Solutions and Comments 1]], [[SearchEnginesWS0910/ExerciseSheet2|Solutions and Comments 2]], [[SearchEnginesWS0910/ExerciseSheet3|Solutions and Comments 3]], [[SearchEnginesWS0910/ExerciseSheet4|Solutions and Comments 4]].

= Exercise Sheet 5 =

The recordings of all lectures are now available, see above. Lecture 2 is missing because we had technical problems there. To play the recordings (it's .lpd files) you need the Lecturnity Player. [[http://www.lecturnity.de/de/download/lecturnity-player|You can download the player for free here]].

[[SearchEnginesWS0910/Rules|Here are the rules for the exercises as explained in Lecture 2]].

[[SearchEnginesWS0910/ExerciseSheet5|Here you can upload your solutions for Exercise Sheet 5]].
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-Thank you for the response. Does this also concern the inverted index? I'm wondering because the slides only contain examples where the list of documents does not contain duplicate entries. Personally, I could imagine a practical use for both variants. That's why i'm asking. Thanks again in advance. '''Björn 25Oct09 7:20pm'''

Hi Björn + all: occurrence always means individual occurrence, that is, if a collection has two documents and the word x occurs once in the first document and twice in the second document then there are three occurrences of this word overall. Ok? '''Hannah 25Oct09 2:12pm'''

To Zhongjie + all: you are right, you can't add the #acl line to the document yourself, so I just did it for you. I will change the instructions on the upload page accordingly. Sorry for this initial confusion, but hey, good that we have a Wiki. '''Hannah 25Oct09 2:06pm'''

Hey everyone! Whenever the exercise is talking about frequencies and occurences. Does it talk about occurences in different documents or should we considre multiple occurences in the same document. Thanks a lot. '''Björn 25Oct09 12:49pm'''

To Johannes: How did you solve the problem? I have logged in my account as my name, and my email links only this account. But I still get the error message 'You can't change ACLs on this page since you have no admin rights on it! ' when I try to enter '#acl ZhongjieCai:read,write -All:read ' to the first line of the page... '''Zhongjie 25Oct09 01:15am'''

Problem solved. To everybody: don't try to create multiple users with the same e-mail address. '''Johannes 25Oct09 00:21am'''

Oh, I see, well that *must* be your user name. Sorry for not making that clear earlier. Please create an account with that user name and try again. '''Hannah 25Oct09 00:02am'''

No that is not my user name. '''Johannes 24Oct09 11:58pm'''

Hi Johannes, if you are logged in as JohannesStork you should be able to see it, did you try that? '''Hannah 24Oct09 11:59pm'''

I don't know if this is the right place to ask, but I can't access my exercise page. It says "Sie dürfen diese Seite nicht ansehen." '''Johannes 24Oct09 11:50pm'''

Good question, Johannes. Please upload the source code separately, either as a .zip or .tgz archive. I have modified the instructions on the upload page accordingly. Sorry if that means additional work for you, we weren't expecting anybody to submit so early ... '''Hannah 24Oct09 11:43pm'''

Shall we put the whole source into the PDF? What about tar.gz? '''Johannes 24Oct09 5:18pm'''

Hi Johannes + all, the slides are now availabe as PDF, see the link above. '''Hannah 23Oct09 17:04'''

'''Note about Exercise 5:''' One can assume that a more general model of the word frequencies is given than that given in the lecture, i.e. eps * N * (1 / i^alpha). Now both parameters (eps and alpha) can be estimated simultaneously. '''Marjan 23Oct09 3:29pm'''

Can you provide the slides as PDF? '''Johannes 23Oct09 10:05am'''

Please note that the deadline for uploading your solutions of the exercises is always Monday, 23:59 (sharp). '''Marjan 22Oct09 6:15pm'''

When you add a question or comment here, please end it with your name and the date and time in bold face, just like I did now. '''Hannah 22Oct09 01:59am'''

Exercise Sheet 5

Questions or comments below this line, most recent on top please