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<Desmonde_Wolf> | does anyone actuallt use this??? | 2009-11-22 17:23:41 |
| gues not... | 2009-11-22 17:23:54 |
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<mike___> | hi | 2009-11-23 18:17:15 |
<Shelwien> | hi | 2009-11-23 18:17:23 |
<mike___> | not much activity here, hm? | 2009-11-23 18:18:40 |
<Shelwien> | there's some, see http://ps16893.dreamhost.com/log | 2009-11-23 18:19:03 |
<mike___> | ah, nice | 2009-11-23 18:26:07 |
| i'll just add it to my autojoinlist, maybe i can read some discussions now and then :) | 2009-11-23 18:29:12 |
<Shelwien> | that's a good idea ;) | 2009-11-23 18:29:50 |
| unfortunately most of people on the forum don't understand IRC | 2009-11-23 18:30:09 |
| so they appear, wait for a minute, see that nothing happens, and quit ;) | 2009-11-23 18:30:30 |
<mike___> | hehe. i just discovered that thread in the forum. and since the forum is a quite nice source of information i thought i'll try this channel... | 2009-11-23 18:35:05 |
<Shelwien> | well, its more of a "talk to Shelwien" channel for now ;) | 2009-11-23 18:35:30 |
<mike___> | i've read your entry about mixing with negative weights. have you investigated that any further? | 2009-11-23 18:37:30 |
<Shelwien> | i don't really remember, that's something fairly old probably ;) | 2009-11-23 18:38:25 |
| but no, and I don't think thats a good idea | 2009-11-23 18:38:39 |
| its basically an example of overtuning, when it improves compression | 2009-11-23 18:39:22 |
| maybe inverted counters have a similar effect though | 2009-11-23 18:41:18 |
<mike___> | inverted counters? | 2009-11-23 18:41:31 |
<Shelwien> | i mean, ones where probability of 0 increases when 1 encountered ;) | 2009-11-23 18:41:40 |
<mike___> | ah. like "false" models | 2009-11-23 18:41:55 |
<Shelwien> | my linear counters can turn like that with appropriate parameters | 2009-11-23 18:42:09 |
| and automatic optimizers sets them like that sometimes | 2009-11-23 18:42:28 |
| like in the BWT model | 2009-11-23 18:42:37 |
| ... | 2009-11-23 18:48:32 |
| btw, there's a decompiled ccm source in the topic, with a parallel rangecoder attached to it for speed improvement | 2009-11-23 18:49:06 |
<mike___> | i haven't looked that much into all those code posted at the forums. i'm quite new to the field of data compression. i've been testing different kinds of mixing strategies lately and now i'm thinking of mixing with negative weights, but so far i haven't come up with a reasonable mixing scheme :/ | 2009-11-23 18:52:07 |
<Shelwien> | well, the main problem with that is that there's no physical sense in it | 2009-11-23 18:52:55 |
| wtf is negative probability? | 2009-11-23 18:53:07 |
| but if you want it just for fun, its not so hard to implement | 2009-11-23 18:54:01 |
<mike___> | well of course i'm trying to mix it somehow so that the mixed probability is positive and in (0,1) | 2009-11-23 18:54:57 |
<Shelwien> | easiest would be to make a static linear ( p=p1*(1-w)+p2*w ) or logistic ( s=s1*(1-w)+s2*w ) mixer | 2009-11-23 18:55:02 |
<mike___> | but i didn't succeed yet :) | 2009-11-23 18:55:27 |
<Shelwien> | and try to find some cases where it would provide better results with w out of [0..1] | 2009-11-23 18:55:30 |
| of course, the output probability always has to be in the range - there's no way to use it for encoding otherwise | 2009-11-23 18:56:22 |
| but that linear mixing has a physical interpretation | 2009-11-23 18:56:58 |
| it means that we have a submodel #2 being applicable with probability w, and #1 with probability (1-w) | 2009-11-23 18:58:02 |
| in which case we have to merge the code space intervals corresponding to bits with different submodels | 2009-11-23 18:59:34 |
<mike___> | sure, you can't use that interpretation with negative weights. but maybe there is another sound interpretation... | 2009-11-23 19:00:07 |
<Shelwien> | well, its somewhat similar to inverted counters as i said | 2009-11-23 19:01:11 |
| consider a mix like p1*(1-2)+0.5*2 | 2009-11-23 19:01:30 |
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| http://status.dreamhost.com/ | 2009-11-24 09:08:34 |
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<toffer> | hi | 2009-11-24 10:35:04 |
<Shelwien> | hi | 2009-11-24 10:35:09 |
<toffer> | today i finished my thesis with that presentation - now i'm finally officially an engineer :D | 2009-11-24 10:37:26 |
<Shelwien> | congratulations ;) | 2009-11-24 10:37:26 |
<toffer> | thanks alot | 2009-11-24 10:37:26 |
| pretty glad now | 2009-11-24 10:37:26 |
| and i got the full score | 2009-11-24 10:37:26 |
<Shelwien> | cool | 2009-11-24 10:37:26 |
| i always was too lazy for that ;) | 2009-11-24 10:37:26 |
| and what's the specialty btw? | 2009-11-24 10:37:42 |
<toffer> | i had pretty much effort there | 2009-11-24 10:37:42 |
| specialiy? | 2009-11-24 10:37:48 |
| speciality | 2009-11-24 10:37:52 |