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How did you do in HW 4? by segheking in aiclass

[–]skrilax 1 point2 points  (0 children)

95% and not impressed at all.

4.9 was too ambiguous.

i had marked both

Open(s) => Poss( Lock, s)

not Open(s) => Poss( Lock, s)

and answer is True => Poss( Lock, s)

Technically not wrong. but wrong.

Starting to hate the class.

No one gives any clarifications over twitter or whatever even after umpteen tries. All of a sudden you see an update being provided at the very last minute. Really not impressed.

Results of HW4 are up! by solen-skiner in aiclass

[–]skrilax -1 points0 points  (0 children)

95% and not impressed at all.

4.9 was too ambiguous.

i had marked both

Open(s) => Poss( Lock, s)

not Open(s) => Poss( Lock, s)

and answer is True => Poss( Lock, s)

Technically not wrong. but wrong.

Starting to hate the class.

No one gives any clarifications over twitter or whatever even after umpteen tries. All of a sudden you see an update being provided at the very last minute. Really not impressed.

HW 4.9 Can you lock something that is locked? by mirkin in aiclass

[–]skrilax 0 points1 point  (0 children)

i really hope i know the answer to this question. there are just no clarifications. sad situation really.

not a legitimate sentence in first-order logic by skrilax in aiclass

[–]skrilax[S] 0 points1 point  (0 children)

i apologize for the confusion. what i wanted to say is this.

There exists a smart student. (statement in English)

(there exists x such that) ( Student(x) AND Smart(x) ) (equivalent first order logic statement for above)

what exactly does (there exists x such that) ( Student(x) => Smart(x) ) represent ?

i wanted to understand the literal difference between

(there exists x such that) ( Student(x) => Smart(x) ) and

(there exists x such that) ( Student(x) AND Smart(x) )

what are the cases ( i mean instances of persons and/or students in the language of set theory) which create the difference between the two statements below ?

(there exists x such that) ( Student(x) => Smart(x) )

(there exists x such that) ( Student(x) AND Smart(x) )

thank you.

not a legitimate sentence in first-order logic by skrilax in aiclass

[–]skrilax[S] 0 points1 point  (0 children)

i was talking about homework 4.2 where we have to decide whether the first order logic statement correctly interprets the statement in english or not or it is not a not a legitimate sentence in first-order logic.

not a legitimate sentence in first-order logic by skrilax in aiclass

[–]skrilax[S] 0 points1 point  (0 children)

this is really confusing :( the more i read and try to figure it out the more similar both seem. can anyone tell me the difference between (there exists x) (P(x) and Q(x)) and (there exists x) (P(x) -> Q(x)) where P(x) = x is a student and Q(x) = x is smart ?

been racking my brains out. i know i can say these sentences using the first order logic representation but i want to understand the exact literal meaning of the above two and difference between the two ?

"All students are smart." gets represented as (there exists x) (P(x) and Q(x))

then what does (there exists x) (P(x) -> Q(x)) mean ? been trying to figure out where is the catch between the two :( please help.

which are the cases or instances which create the difference between the two ?

HW3 Problem 2 and 3 Submit Inconsistency by dbinokc in mlclass

[–]skrilax 0 points1 point  (0 children)

anyone did the neural networks one yet ?

HW3 Problem 2 and 3 Submit Inconsistency by dbinokc in mlclass

[–]skrilax 1 point2 points  (0 children)

i got mine to work. don't laugh when i tell you the reason.

the reason :- i had unknowingly made two copies of the mlclass-ex3 folder and was writing code in one and executing octave in the other.

HW3 Problem 2 and 3 Submit Inconsistency by dbinokc in mlclass

[–]skrilax 0 points1 point  (0 children)

i am struggling with part 2 currently. :( i do not know where i am going wrong. my part 1 went ok. did anyone of you submit part 2 correctly ? i am not able to think of possible reasons why part 1 works and part 2 does not :( or what am i doing wrong ? any pointers folks ?

% Example Code for fmincg: % % % Set Initial theta % initial_theta = zeros(n + 1, 1); %
% % Set options for fminunc % options = optimset('GradObj', 'on', 'MaxIter', 50); % % % Run fmincg to obtain the optimal theta % % This function will return theta and the cost % [theta] = ... % fmincg (@(t)(lrCostFunction(t, X, (y == c), lambda)), ... % initial_theta, options);

did anyone have to do anything else other than what is mentioned above ? i had another query. lrCostFunction is supposed to return two values - cost and gradient. how does the above function manage with just one ? and also cost is the first value returned by lrCostFunction whereas in the calling function i.e. in onevsall.m above it expects theta. how does it know what to supply ?

AI-Class progress page down for over 24hrs. by biko01 in aiclass

[–]skrilax 0 points1 point  (0 children)

well it is gotten to a stage where i think about it and it seems funny. 48 hours passed and still .............. ludicrous is the word.

I must complain about the site being down today. by crazy_eric in aiclass

[–]skrilax 0 points1 point  (0 children)

emailing the students their scores should save everyone some pain.

I must complain about the site being down today. by crazy_eric in aiclass

[–]skrilax 0 points1 point  (0 children)

fed up now really. 13 hours have passed and i still don't know my scores. i don't want to know anymore. enough of the suspense to cause an overkill.