|
Size: 1492
Comment:
|
Size: 3205
Comment:
|
| Deletions are marked like this. | Additions are marked like this. |
| Line 3: | Line 3: |
| = Exercise Sheet 1 = [[attachment:SearchEnginesWS0910/ExerciseSheet1/lecture-1.ppt|Here are the PPT 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]]. |
| Line 6: | Line 5: |
| [[attachment:SearchEnginesWS0910/ExerciseSheet1/exercise-1.pdf|Here is a PDF of Exercise Sheet 1]]. | Here are the recordings of some of the lectures so far (Lecture 1 still missing, in Lecture 2 the microphone signal did not come through): [[http://vulcano.informatik.uni-freiburg.de/lecturnity/lecture1/Search_Engines,_Lecture_3,_5Nov09_1_05_11_2009_16_16_20.html|Lecture 3]] |
| Line 8: | Line 7: |
| [[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]]. |
| Line 10: | Line 9: |
| [[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|Exercise Sheet 1]], [[SearchEnginesWS0910/ExerciseSheet2|Exercise Sheet 2]], [[SearchEnginesWS0910/ExerciseSheet3|Exercise Sheet 3]] [[SearchEnginesWS0910/Rules|Here are the rules for the exercises as explained in Lecture 2]]. = Exercise Sheet 3 = [[SearchEnginesWS0910/ExerciseSheet4|Here you can upload your solutions for Exercise Sheet 4]]. |
| Line 13: | Line 18: |
| Please note that the deadline for uploading your solutions of the exercises is always Monday, 23:59 (sharp). '''Marjan 22Oct09 6:15pm''' | |
| Line 15: | Line 19: |
| 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''' | And just to clarify what a single-cycle permutation is. Here is an example for an array of size 5 with a permutation that is a single cycle: 5 4 1 3 2. Why single cycle? Well, A[1] = 5, A[5] = 2, A[2] = 4, A[4] = 3, A[3] = 1. (My indices in this example are 1,...,5 and not 0,...,4.) Here is an example of a permutation with three cycles: 2 1 4 3 5. The first cycle is A[1] = 2, A[2] =1. The second cycle is A[3] = 4, A[4] = 3. The third cycle is A[5] = 5. '''Hannah 12Nov09 8:04pm''' |
| Line 17: | Line 21: |
| Can you provide the slides as PDF? '''Johannes 23Oct09 10:05am''' | Hi Daniel + all, I don't quite understand your question and your example (if your array is 1 5 3 4 2, why is A[1] = 3?). In case you refer to the requirement of the exercise that the permutation consists only of a single cycle. That is because your code should go over each element exactly once (it should, of course, stop after n iterations, where n is the size of the array). If your permutation has more than one cycle, it is hard to achieve that. Also note that for both (1) and (2), the sum of the array values should be sum_i=1,...,n i = n * (n+1) / 2. '''Hannah 12Nov09 7:54pm''' |
| Line 19: | Line 23: |
| '''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''' | Hi, I just looked at the new exercise sheet 4, in exercise 1 we should generate a permutation and sum the resulting array up, am I wrong or doesn't iterating method two iterate throw the whole array in every situation. for ex.: n= 5 permutation: 1 5 3 4 2, then A[1] = 3, A[A[1]]= A[3] = 1, A[1] = 3 ... '''Daniel 12Nov09 19:44pm''' |
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.
Here are the recordings of some of the lectures so far (Lecture 1 still missing, in Lecture 2 the microphone signal did not come through): Lecture 3
Here are PDFs of the exercise sheets so far: Exercise Sheet 1, Exercise Sheet 2, Exercise Sheet 3, Exercise Sheet 4.
Here are your solutions and comments on the previous exercise sheets: Exercise Sheet 1, Exercise Sheet 2, Exercise Sheet 3
Here are the rules for the exercises as explained in Lecture 2.
Exercise Sheet 3
Here you can upload your solutions for Exercise Sheet 4.
Questions or comments below this line, most recent on top please
And just to clarify what a single-cycle permutation is. Here is an example for an array of size 5 with a permutation that is a single cycle: 5 4 1 3 2. Why single cycle? Well, A[1] = 5, A[5] = 2, A[2] = 4, A[4] = 3, A[3] = 1. (My indices in this example are 1,...,5 and not 0,...,4.) Here is an example of a permutation with three cycles: 2 1 4 3 5. The first cycle is A[1] = 2, A[2] =1. The second cycle is A[3] = 4, A[4] = 3. The third cycle is A[5] = 5. Hannah 12Nov09 8:04pm
Hi Daniel + all, I don't quite understand your question and your example (if your array is 1 5 3 4 2, why is A[1] = 3?). In case you refer to the requirement of the exercise that the permutation consists only of a single cycle. That is because your code should go over each element exactly once (it should, of course, stop after n iterations, where n is the size of the array). If your permutation has more than one cycle, it is hard to achieve that. Also note that for both (1) and (2), the sum of the array values should be sum_i=1,...,n i = n * (n+1) / 2. Hannah 12Nov09 7:54pm
Hi, I just looked at the new exercise sheet 4, in exercise 1 we should generate a permutation and sum the resulting array up, am I wrong or doesn't iterating method two iterate throw the whole array in every situation. for ex.: n= 5 permutation: 1 5 3 4 2, then A[1] = 3, A[A[1]]= A[3] = 1, A[1] = 3 ... Daniel 12Nov09 19:44pm