2020. 2. 26. 09:00ㆍ카테고리 없음
# Parameters m, n = X. Shape k = 20 Theta = cp.
Nzb Index
Variable ( n, k ) lam1 = 0.1 lam2 = 1 f = ep. Multiclasshingeloss ( Theta, X, y ) + lam1. cp.
Norm1 ( Theta ) + lam2. cp. Sumsquares ( Theta ) prob = cp. Problem ( cp. Minimize ( f )) ep. Solve ( prob, verbose = True ) Theta0 = np.
Array ( Theta. Value ) print 'Train accuracy:', accuracy ( np. Dot ( Theta0 ), axis = 1 ), y ) print 'Test accuracy:', accuracy ( np. Argmax ( Xtest. Dot ( Theta0 ), axis = 1 ), ytest ).
This article needs additional citations for. Unsourced material may be challenged and removed.Find sources: – ( November 2012) A Usenet newsgroup is a usually within the system, for messages from many users in different locations using. They are and are not devoted to publishing.
Newsgroups are technically distinct from, but functionally similar to, on the. Software is used to read the content of newsgroups.Before the adoption of the, Usenet newsgroups were among the most popular Internet services, and have retained their nature in contrast to the increasingly ad-laden web. In recent years, this form of open discussion on the Internet has lost considerable ground to individually-operated browser-accessible forums and such as and.Communication is facilitated by the (NNTP) which allows connection to Usenet servers and data transfer over the internet.
Similar to another early (yet still used) protocol SMTP which is used for email messages. NNTP allows both server-server and client-server communication - this means that newsgroups can be replicated from server to server which gives the Usenet network the ability to maintain a level of robust data persistence as a result of built-in data redundancy. However, most users will access using only the client-server commands of NNTP and in almost all cases will use a GUI for browsing as opposed to command line based client-server communication specified in the NNT protocol. Contents.Types Newsgroups generally come in either of two types, binary or text.
There is no technical difference between the two, but the naming differentiation allows users and servers with limited facilities to minimize network bandwidth usage. Generally, Usenet conventions and rules are enacted with the primary intention of minimizing the overall amount of network traffic and resource usage.Typically, the newsgroup is focused on a particular topic of interest.
A message sent for publication on a newsgroup is called a 'post'. Some newsgroups allow posts on a wide variety of themes, regarding anything a member chooses to discuss as, while others keep more strictly to their particular subject, frowning on posts.
The news admin (the administrator of a ) decides how long posts are kept on their server before being expired (deleted). Different servers will have different retention times for the same newsgroup; some may keep posts for as little as one or two weeks, others may hold them for many months. Some admins keep posts in local or technical newsgroups around longer than posts in other newsgroups.Back when the early community was the pioneering computer society, the common habit seen with many posts was a notice at the end that disclosed whether the author had (or was free of) a personal interest (financial, political or otherwise) in making the post. This is rarer now, and the posts must be read more skeptically, as with other media.
Privacy and issues have also risen in importance.The number of newsgroups grew from more than 100 as of 1983 to more than 110,000, but only 20,000 or so of those are active. Newsgroups vary in popularity; some newsgroups receive under a dozen posts per year while the most popular can get several thousand in under an hour.Non-Usenet newsgroups are possible and do occur, as private individuals or organizations set up their own NNTP servers. Examples include the newsgroups runs to allow peer-to-peer support of their products and those at.Binary While newsgroups were not created with the intention of distributing files such as pictures, sound and video, they have proven to be quite effective for this.
Because newsgroups are widely distributed, a file uploaded once will be spread to many other servers and can then be downloaded by an unlimited number of users. More useful is that users download from a local news server, rather than from a more distant machine with perhaps limited connectivity, as may be the case with technology. In fact, this is another benefit of newsgroups: it is usually not expected that users share.
If every user makes uploads then the servers would be flooded; thus it is acceptable and often encouraged for users to just.There were originally a number of obstacles to the transfer of binary files over Usenet. Usenet was originally designed with the transmission of text in mind, and so the encoding of posts caused losses in binary data where the data was not part of the protocol's. Consequently, for a long while, it was impossible to send binary data as such. As workarounds, such as and later and were developed which encoded the binary data from the files to be transmitted (e.g.
Sound or video files) to text characters which would survive transmission over Usenet. At the receiver's end, the data needed to be decoded by the user's.Additionally, there was a limit on the size of individual posts so that large files could not be sent as single posts.
To get around this, Newsreaders were developed which were able to split long files into several posts. Intelligent newsreaders at the other end could then automatically group such split files into single files, allowing the user to easily retrieve the file. These advances have meant that Usenet is used to send and receive many of files per day.There are two main issues that pose problems for transmitting large files over newsgroups.
The first is and the other is. The business of premium is generated primarily on their ability to offer superior completion and retention rates, as well as their ability to offer very fast connections to users. Completion rates are significant when users wish to download large files that are split into pieces; if any one piece is missing, it is impossible to successfully download and reassemble the desired file. To work around the problem, a redundancy scheme known as (PAR) is commonly used.Major NSPs have a retention time of more than 7 years. A number of websites exist to keep an index of files posted to binary newsgroups.Partly because of such long retention times, as well as growing and speeds, Usenet is also used by individuals to store data in a practice called Usenet backup, or uBackup.
While commercial providers offer, storing data on Usenet is free of charge (although access to Usenet itself may not be). Because anyone can download the backup files, the data is typically.
After the files are uploaded, the uploader has no control over them; they are automatically distributed to all Usenet providers that subscribe to the newsgroup they are uploaded to, so there will be copies of them spread all around the world.Moderated newsgroups Most Newsgroups are not moderated. A moderated newsgroup has one or more individuals who must approve posts before they are published.
A separate address is used to submit posts and the moderators then propagate those they approve of. The first moderated newsgroups appeared in 1984 under mod.
according to, 'Hobbes' Internet Timeline'.Distribution Transmission within and at the bounds of the network uses the (NNTP) (Internet standard of 2006, updating of 1986).Newsgroup servers are hosted by various organizations and institutions. Most host their own, or rent access to one, for their subscribers. There are also a number of companies who sell access to premium news servers.Every host of a news server maintains agreements with other nearby news servers to synchronize regularly. In this way news servers form a network. When a user posts to one news server, the post is stored locally. That server then shares posts with the servers that are connected to it for those newsgroups they both carry.
Those servers do likewise, propagating the posts through the network. For newsgroups that are not widely carried, sometimes a carrier group is used for to aid distribution. This is typically only useful for groups that have been removed or newer alt. groups. Crossposts between hierarchies, outside of the Big 8 and alt. hierarchies, are prone to failure.Hierarchies. Main article:Newsgroups are often arranged into hierarchies, theoretically making it simpler to find related groups.
The term top-level hierarchy refers to the hierarchy defined by the prefix before the first dot.The most commonly known hierarchies are the Usenet hierarchies. So for instance newsgroup rec.arts.sf.starwars.games would be in the rec. top-level Usenet hierarchy, where the asterisk (.) is defined as a. There were seven original major hierarchies of Usenet newsgroups, known as the 'Big 7':. — Discussion of computer-related topics. news. — Discussion of Usenet itself.
— Discussion of scientific subjects. rec. — Discussion of recreational activities (e.g. Games and hobbies). soc. — Socialising and discussion of social issues. talk.
— Discussion of contentious issues such as religion and politics. misc. — Miscellaneous discussion—anything which does not fit in the other hierarchies.These were all created in the of 1986–1987, before which all of these newsgroups were in the net. hierarchy. At that time there was a great controversy over what newsgroups should be allowed. Among those that the (who effectively ran the Big 7 at the time) did not allow were those concerning, and.This situation resulted in the creation of an alt. (short for 'alternative') Usenet hierarchy, under which these groups would be allowed.
Over time, the laxness of rules on newsgroup creation in alt. compared to the Big 7 meant that many new topics could, given time, gain enough popularity to get a Big 7 newsgroup. There was a rapid growth of alt. as a result, and the trend continues to this day. Because of the anarchistic nature with which the groups sprang up, some jokingly referred to ALT standing for ', and ' (a ).In 1995, humanities. was created for the discussion of the humanities (e.g.
Literature, philosophy), and the Big 7 became the Big 8.The has discussion of all kinds of topics, and many hierarchies for discussion specific to a particular geographical area or in a language other than English.Before a new Big 8 newsgroup can be created, an RFD (Request For Discussion) must be posted into the newsgroup, which is then discussed in. Once the proposal has been formalized with a name, description, charter, the will vote on whether to create the group.
If the proposal is approved by the, the group is created. Groups are removed in a similar manner.Creating a new group in the alt. hierarchy is not subject to the same rules; anybody can create a newsgroup, and anybody can remove it, but most news administrators will ignore these requests unless a local user requests the group by name.Further hierarchies There are a number of newsgroup hierarchies outside of the Big 8 (and alt.) that can be found on many news servers. These include non-English language groups, groups managed by companies or organizations about their products, geographic/local hierarchies, and even non-internet network boards routed into NNTP.