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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]], [[attachment:SearchEnginesWS0910/lecture-6.pdf|Lecture 6]], [[attachment:SearchEnginesWS0910/lecture-7.pdf|Lecture 7]], [[attachment:SearchEnginesWS0910/lecture-8.pdf|Lecture 8]]. |
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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|Recording Lecture 1]], [[http://vulcano.informatik.uni-freiburg.de/lecturnity/lecture-3.lpd|Recording Lecture 3]], [[http://vulcano.informatik.uni-freiburg.de/lecturnity/lecture-4.lpd|Recording Lecture 4]], [[http://vulcano.informatik.uni-freiburg.de/lecturnity/lecture-5.lpd|Recording Lecture 5 (no audio)]], [[http://vulcano.informatik.uni-freiburg.de/lecturnity/lecture-6.lpd|Recording Lecture 6 (with audio for a change)]], [[http://vulcano.informatik.uni-freiburg.de/lecturnity/lecture-7.avi|Recording Lecture 7 (AVI)]], [[http://vulcano.informatik.uni-freiburg.de/lecturnity/lecture-8.avi|Recording Lecture 8 (AVI)]]. |
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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]], [[attachment:SearchEnginesWS0910/exercise-6.pdf|Exercise Sheet 6]], [[attachment:SearchEnginesWS0910/exercise-7.pdf|Exercise Sheet 7]], [[attachment:SearchEnginesWS0910/exercise-8.pdf|Exercise Sheet 8]]. |
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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]], [[SearchEnginesWS0910/ExerciseSheet5|Solutions and Comments 5]], [[SearchEnginesWS0910/ExerciseSheet6|Solutions and Comments 6]], [[SearchEnginesWS0910/ExerciseSheet7|Solutions and Comments 7]]. = Exercise Sheet 8 = The recordings of all lectures are now available, see above. Lecture 2 is missing because we had technical problems there. To play the Lecturnity recordings (.lpd files) you need the [[http://www.lecturnity.de/de/download/lecturnity-player|Lecturnity Player, which you can download here]]. I put the Camtasia recordings as .avi files, which you can play with any ordinary video player; I would recommend [[http://www.videolan.org/vlc|VLC]]. [[SearchEnginesWS0910/Rules|Here are the rules for the exercises as explained in Lecture 2]]. [[SearchEnginesWS0910/ExerciseSheet8|Here you can upload your solutions for Exercise Sheet 8]]. |
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Hi! In Exercise 4: Do we have to compute all possible pairs of query-words with one hit or only one pair of words? '''Claudius 26Oct 12:50am''' | One question on exercise 3: Do we have to assume that each transformation is of a certain form (i.e. insert at i'th character of current word, where it matters how many deletes/inserts have been done previously)? Or can we assume that a transformation somehow "knows" its position? If we have to deal with it in an abstract way, should we create our own way of describing a transformation or is there a formalism we all should use. '''Björn 13:31''' |
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To Björn: No, it does not. You do not need to include positional information in your inverted index. But you're right: indexes are usually positional and the Zipf's law refers to the size of the inverted lists when positions are included. '''Marjan 25Oct 7:45pm''' | Here is another bonus point system: http://www.informatik.uni-freiburg.de:8081/swt/teaching/winter-term-2009/informatik-iii-theoretische-informatik. Additionally I would like to add that most of these bonus point systems have exercises which are far less work. '''Björn''' |
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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''' | |
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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''' | In some other lectures the points from the sheets are used to increase the grade from the exam. If one got 50% then she/he got 0.3 grade better, 80% for 0.6 better, but min. 4.0 in exam. I.e. 83% of the exercise points and 2.3 in exam = 1.7 final grade. Data Mining & Machine Learning used a more complex scheme, there was theoretical sheets and practical sheets using Weka (the slides should be on electures server). '''Markus 14Dec09 9:23''' |
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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''' | Many exercise sheets contained two tasks and for each task we could get 1 point. That means that we could got 2 or even 3 points per sheet. The exercises were optional, but because of the bonus points most students did the exercises. There was another reason to do the exercises. In this lecture the exam was very similar to the exercise sheet tasks, so we had two considerable advantages. In two other lectures we had to achieve 30 and 50% of the exercise points to participate at the exam. '''Manuela 14Dec09 00:57''' |
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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''' | Now that I think about it, there were points for solving exercises in exercise-class. Also, there were more than 15 points achievable over the semester, but max. 15 were credited in the exam. '''alex 13Dec09 23:57''' |
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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''' | In that lecture we could reach max. 15 bonus points for the exercises. Each exercise sheet scored one point + one extra point for specially good/clever solutions. I don't think there was a constraint on admission to the exam. There might have been points for solving exercises in the exercise-class, but I'm not sure about that. (--> already one year ago) '''alex 13Dec09 23:48''' |
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Problem solved. To everybody: don't try to create multiple users with the same e-mail address. '''Johannes 25Oct09 00:21am''' | Thanks for the link, Alex, can you please explain the thing with the "bonus point of the exercise"? Is it that there were 15 bonus points to reach in the exercises? How many tasks in the exercises got bonus points and how many didn't? And the non-bonus tasks than only counted for admission to the exam? '''Hannah 13Dec09 23:36''' |
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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''' | I quite liked this scheme, although it does not put that much weight on the exercises: http://cone.informatik.uni-freiburg.de/teaching/vorlesung/algorithmentheorie-w08/exam.html '''alex 13Dec09 23:17''' |
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No that is not my user name. '''Johannes 24Oct09 11:58pm''' | Can someone please post the details of one of the existing bonus systems here? (Something like: for xyz % of the exercises, you can improve your exam mark by abc.) Or the links to a course site where these details are given. Thanks! '''Hannah 13Dec09 23:09''' |
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Hi Johannes, if you are logged in as JohannesStork you should be able to see it, did you try that? '''Hannah 24Oct09 11:59pm''' | To Mirko + all: Yes, it's d, I don't know how I've missed this one. '''Marjan 12Dec09 13:16''' |
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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''' |
About Exercise 1: in the second part, is it really delta? shouldn't it be d? '''Mirko 12Dec09, 12:43''' |
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, Lecture 6, Lecture 7, Lecture 8.
Here are .lpd files of the recordings of the lectures so far (except Lecture 2, where we had problems with the microphone): Recording Lecture 1, Recording Lecture 3, Recording Lecture 4, Recording Lecture 5 (no audio), Recording Lecture 6 (with audio for a change), Recording Lecture 7 (AVI), Recording Lecture 8 (AVI).
Here are PDFs of the exercise sheets so far: Exercise Sheet 1, Exercise Sheet 2, Exercise Sheet 3, Exercise Sheet 4, Exercise Sheet 5, Exercise Sheet 6, Exercise Sheet 7, Exercise Sheet 8.
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, Solutions and Comments 5, Solutions and Comments 6, Solutions and Comments 7.
Exercise Sheet 8
The recordings of all lectures are now available, see above. Lecture 2 is missing because we had technical problems there. To play the Lecturnity recordings (.lpd files) you need the Lecturnity Player, which you can download here. I put the Camtasia recordings as .avi files, which you can play with any ordinary video player; I would recommend VLC.
Here are the rules for the exercises as explained in Lecture 2.
Here you can upload your solutions for Exercise Sheet 8.
Questions or comments below this line, most recent on top please
One question on exercise 3: Do we have to assume that each transformation is of a certain form (i.e. insert at i'th character of current word, where it matters how many deletes/inserts have been done previously)? Or can we assume that a transformation somehow "knows" its position? If we have to deal with it in an abstract way, should we create our own way of describing a transformation or is there a formalism we all should use. Björn 13:31
Here is another bonus point system: http://www.informatik.uni-freiburg.de:8081/swt/teaching/winter-term-2009/informatik-iii-theoretische-informatik. Additionally I would like to add that most of these bonus point systems have exercises which are far less work. Björn
In some other lectures the points from the sheets are used to increase the grade from the exam. If one got 50% then she/he got 0.3 grade better, 80% for 0.6 better, but min. 4.0 in exam. I.e. 83% of the exercise points and 2.3 in exam = 1.7 final grade. Data Mining & Machine Learning used a more complex scheme, there was theoretical sheets and practical sheets using Weka (the slides should be on electures server). Markus 14Dec09 9:23
Many exercise sheets contained two tasks and for each task we could get 1 point. That means that we could got 2 or even 3 points per sheet. The exercises were optional, but because of the bonus points most students did the exercises. There was another reason to do the exercises. In this lecture the exam was very similar to the exercise sheet tasks, so we had two considerable advantages. In two other lectures we had to achieve 30 and 50% of the exercise points to participate at the exam. Manuela 14Dec09 00:57
Now that I think about it, there were points for solving exercises in exercise-class. Also, there were more than 15 points achievable over the semester, but max. 15 were credited in the exam. alex 13Dec09 23:57
In that lecture we could reach max. 15 bonus points for the exercises. Each exercise sheet scored one point + one extra point for specially good/clever solutions. I don't think there was a constraint on admission to the exam. There might have been points for solving exercises in the exercise-class, but I'm not sure about that. (--> already one year ago) alex 13Dec09 23:48
Thanks for the link, Alex, can you please explain the thing with the "bonus point of the exercise"? Is it that there were 15 bonus points to reach in the exercises? How many tasks in the exercises got bonus points and how many didn't? And the non-bonus tasks than only counted for admission to the exam? Hannah 13Dec09 23:36
I quite liked this scheme, although it does not put that much weight on the exercises: http://cone.informatik.uni-freiburg.de/teaching/vorlesung/algorithmentheorie-w08/exam.html alex 13Dec09 23:17
Can someone please post the details of one of the existing bonus systems here? (Something like: for xyz % of the exercises, you can improve your exam mark by abc.) Or the links to a course site where these details are given. Thanks! Hannah 13Dec09 23:09
To Mirko + all: Yes, it's d, I don't know how I've missed this one. Marjan 12Dec09 13:16
About Exercise 1: in the second part, is it really delta? shouldn't it be d? Mirko 12Dec09, 12:43