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in discussion News / Course News » *** Moed B + Final grades published ***

Hi all,

Moed B exam and solution published.

Grades for Moed B + final course grade are available under the "exam" tab. Grades will processed by the Mazkirut soon.

Thanks,

Regev

in discussion News / Course News » *** Final Moed A grades published ***

Exercises 4 and 5 have been checked and returned in the hive. Their grades are posted in the HW tab.

For those who did Moed A, final grades have been calculated, and are available under the exam. They will be submitted to the Mazkirut soon.

Let me know if there are any issues or appeals.

Thanks!

Don't know if this is still needed, but ssh'ing to "gauss" can only be done after connecting to Nova

The ssh command is the same, just didn't find the server..

I was stupidly multiplying var by I , thanks for that =) does go in seconds now

1. Maybe one of /usr/bin/ssh, or /bin/ssh works ?

Every mac comes with ssh preinstalled - so you just need to find it.

Maybe try in another terminal (try running ssh under: Terminal/bash/konsole/tcsh)

2. In HW5, if you use numpy just for the heavy part (the distances ||x_i - u_m|| ^ 2)

then the code runs in a few seconds, so there is no need to do anything special.

The programming assigment is taking longer than expected.

Although it seem short, its cimplicated.

We had a test on this course about 1 week ago, and we have tests on other courses too.

Considering we didn't receive the grades for hw4,

Please consider an extension of few days, for the programming part only.

Thanks.

I am using bash on mac, can it / does it work the same?

I'm getting 'ssh: No match'

Try running it one of the "gauss" computers instead, it will probably be a lot less busy.

After connecting to Nova, you can ssh to one of them through Putty, using the command "ssh gauss-**.cs.tau.ac.il".

The password it requires is the same as the one you used to log in to Nova.

I got the code running perfectly okay on my computer, but when I try running it on nova I get a 'killed' message on different running times (it sometimes comes before the distributions are calculated and sometimes already after the graph and images are saved).

I tried running also the old hw3 code which used to work fine and now also it gives a killed message at different points.

Anything to be done? Is it because of current overload on the servers?

Not sure, probably morning

Your call. I assume you will get partial points, which is better than nothing.. :)

Thanks but its what im doing… and I cant get it to work.

I'm battling the code for 3 days without any real progress.

Is there a point to submit an un-working code?

in discussion Discussions / HW5 » Q3 | log likelihood of parameters given data, or data given parameters

Thank you.

הבעיה היא שהתרגיל התכנותי עושה להרבה אנשים בעיות עם הדיבוג, ובגלל שאנחנו בתקופת מבחנים זה מאוד מקשה עלינו.

אם היינו רואים קודם את ציוני שב 4, אז היינו יודעים אם בכלל אפשר לוותר על הכנת התרגיל

Which hour on Monday?

There will be no extra time - this exercise is short, with an extended deadline, and is non-mandatory (in the 5/6 sense). Note that the checker won't pick it up until Monday.

Here's a recipe that can help:

1. Calculate $\log P(z_i = j, x_i)$ - do this by using the log of the expression for the pdf of normal directly. Let's call this number $b_{i,j}$.

2. Calculate $\log P(x_i) = \log(\sum_{j=1}^K P(z_i = j, x_i)) = log(\sum_{j=1}^K exp(b_{i,j}))$. This can be done by using the logsumexp function in numpy.

2. Calculate $\log P(z_i = j | x_i)$. By Bayes' law, this is equal to $\log P(z_i = j , x_i) - \log P(x_i)$, which uses quantities calculated in 1+2.

There will be no extra time - this exercise is short, with an extended deadline, and is non-mandatory (in the 5/6 sense). Note that the checker won't pick it up until Monday.

in discussion Discussions / HW5 » Q3 | log likelihood of parameters given data, or data given parameters

Yes - that is the definition of likelihood.

I can't get my code to working.. I understand what to do and what I need to calculate but I keep getting errors with dividing by zero or singular matrix or god knows….

Can we get some directions on how to implement the calculations and some extra time to do it?

Thanks,

Ofer.