Oggy Oggy Oggy other side of the River Tamar. "Oggy" is a slang term for a Cornish pasty, derived from its Cornish name, ""hoggan"", and was used by local Devon and Cornish sailors at the Devonport Dockyard in reference to pasty sellers who once stood outside the gates. The Devonport marines are still associated with the song which they generally sing at public displays. Tin-miners' wives or pasty sellers supposedly shouted ""Oggy Oggy Oggy"" – the response from any hungry miner or labourer would be "Oi!, Oi!, Oi!." The chant is also the chorus of a folk song and has always been heard
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