2010-11

Administration

Lecturer: Ido Dagan Email: dagan@cs.biu.ac.il

Class Hours: Mondays 16:00-18:00

Important Messages

23.01	Download last year exams. Note: these exams are given with sketch/bottom line solutions. These should not be regarded as acceptable full answers, they are only notes for the correct answer and they are given as is – no further explanations will be provided for these exams and their solutions.
06.01	Ex.3's grades are published. In the next couple of days you should get an email from the course's account with a pdf version of your report annotated with comments. The email will be sent to the CS email of the student which submitted the exercise.
28.12	You should have gotten an email from 'Course 89-919' with your ex2 grade and report with my comments. In any case of dispute between the grade in your email and the grade written in the table on this website - the one listed here is the final one.
22.12	Ex.4 was published. Important: there is a self study part for this ex. You should read the file Underflow Scaling and Smoothing in EM attached to the exercise. You cannot do the ex. without understanding it and it is also a part of the course material.
20.12	Ex.2's grades are published. In the next couple of days you should get an email from the course's account with a pdf version of your report annotated with comments. The email will be sent to the CS email of the student which submitted the exercise. It doesn't work now, so give it a couple of days.
8.12	Ex. 3 was published.
6.12	There was a problem with submitting the exercise, but now it is solved. If you have submitted your ex. before 6.12 13:00 it was probably not accepted and you should resubmit it.
1.12	the next class will be on 6/12 at 12-14, at building 105, class 61
24.11	See notes regarding your solutions for ex.1 and towards the coding of ex.2
23.11	Ex. 2 and datasets were published. Submissions of all programming exercises should be in pairs.
18.11	Ex. 1: grades and solution were published
9.11	There will no class next week. There will be a class instead on 6/12, at 12:00 (room TBD; notice that's Hanukah and there will be no class in the afternoon).
17.10	Course website is up. A basic probability equations summary page was published. Ex. 1 was published.

Programming exercises should be submitted via Submit web interface.

1^st exercise

Download Solution

A note regarding your solutions:

Choose short and informative notations for events.

A series of events should be a combination of atomic events.

The following event denotations are not good enough:

A - the number of times the first coin turns heads

B - the number of times the second coin turns tail

should be something like H₁ and T₂ respectively for instance – the letter chosen for the event is related to it and the subscript define the coin

C - the event of seeing tail k times after getting heads 3 times (see denotation in the solution)

Please go over the solution to learn how to denote probabilistic events (and in the future probabilistic models)

and how to write a short mathematical answer. In the rest of the course and in the exam, long verbal answers will not receive full points.

2^nd exercise

Download Datasets

Notes for ex.2:

· avoid a common mistake from previous years, in calculating the perplexity, forgetting that Java/Python log function is

actually ln (and not log2) therefore you need to use exponent (e^) and not 2^.

3^rd exercise

Download

4^th exercise

Download self-study

Exercise Grades

תעודת זהות	תרגיל 1	תרגיל 2	תרגיל 3	תרגיל 4
11617594	90	64	80
31409592	100	95	96
32490757	65	92	100
34839548	97	97	100
36171270	93	100	100
36569820	98	100	99
36856722	95	100	84
37088820	90	95	90
37485703	100	97	93
38113247	92	100	95
38154779	75	95	90
39201710	78	95	90
39542741	73	82
39760939	90	64	80
39904651	87	100	100
40976581	90	100	99
43046044	90	87	88
52988151	70	92	100
65968083	100	88	86
66628074	100	88	86
200112688	76	100	100
200165769	99	95	96
300543014	95	100	95
301642799	97	100	80
302434253	100	100	80
302530126	99	85	86
304078736	85	100	84
306041062	98	100	100
306127721	63
307188342	96	100	100
307597997	80
308990340	100	97	100
321870032	70	77
324751940	81	100	100
ממוצע	88.6	93.3	91.3