South African hacker history hacktivists equal to the task. That force will now break into government information vaults and bring to light the evidence that will reveal corruption and nefarious doings." Through a series of tweets 'data dump' using the account @DomainerAnon, explained that they hacked into the website “for the 34 miners killed during clashes with police in Marikana on August 16, 2012”. South African hacker history A brief history of computer hacking in South Africa. Note: A distinction needs to be made between a "white hat" hacker who hacks out of intellectual curiosity, and a "black hat" hacker who has ulterior motives.
Item-item collaborative filtering Earlier collaborative filtering systems based on rating similarity between users (known as user-user collaborative filtering) had several problems: Item-item models resolve these problems in systems that have more users than items. Item-item models use rating distributions "per item", not "per user". With more users than items, each item tends to have more ratings than each user, so an item's average rating usually doesn't change quickly. This leads to more stable rating distributions in the model, so the model doesn't have to be rebuilt as often. When users consume and then rate an item, that item's similar items are picked from