## 2.0 BOOTSTRAP JS PHILOSOPHY
These are the high-level design rules which guide the development of Bootstrap's plugin apis.
---
### DATA-ATTRIBUTE API
We believe you should be able to use all plugins provided by Bootstrap purely through the markup API without writing a single line of javascript.
We acknowledge that this isn't always the most performant and sometimes it may be desirable to turn this functionality off altogether. Therefore, as of 2.0 we provide the ability to disable the data attribute API by unbinding all events on the body namespaced with `'data-api'`. This looks like this:
$('body').off('.data-api')
To target a specific plugin, just include the plugins name as a namespace along with the data-api namespace like this:
$('body').off('.alert.data-api')
---
### PROGRAMATIC API
We also believe you should be able to use all plugins provided by Bootstrap purely through the JS API.
All public APIs should be single, chainable methods, and return the collection acted upon.
$(".btn.danger").button("toggle").addClass("fat")
All methods should accept an optional options object, a string which targets a particular method, or null which initiates the default behavior:
$("#myModal").modal() // initialized with defaults
$("#myModal").modal({ keyboard: false }) // initialized with now keyboard
$("#myModal").modal('show') // initializes and invokes show immediately afterqwe2
---
### OPTIONS
Options should be sparse and add universal value. We should pick the right defaults.
All plugins should have a default object which can be modified to effect all instance's default options. The defaults object should be available via `$.fn.plugin.defaults`.
$.fn.modal.defaults = { … }
An options definition should take the following form:
*noun*: *adjective* - describes or modifies a quality of an instance
examples:
backdrop: true
keyboard: false
placement: 'top'
---
### EVENTS
All events should have an infinitive and past participle form. The infinitive is fired just before an action takes place, the past participle on completion of the action.
show | shown
hide | hidden
---
### CONSTRUCTORS
Each plugin should expose it's raw constructor on a `Constructor` property -- accessed in the following way:
$.fn.popover.Constructor
---
### DATA ACCESSOR
Each plugin stores a copy of the invoked class on an object. This class instance can be accessed directly through jQuery's data API like this:
$('[rel=popover]').data('popover') instanceof $.fn.popover.Constructor
---
### DATA ATTRIBUTES
Data attributes should take the following form:
- data-{{verb}}={{plugin}} - defines main interaction
- data-target || href^=# - defined on "control" element (if element controls an element other than self)
- data-{{noun}} - defines class instance options
examples:
// control other targets
data-toggle="modal" data-target="#foo"
data-toggle="collapse" data-target="#foo" data-parent="#bar"
// defined on element they control
data-spy="scroll"
data-dismiss="modal"
data-dismiss="alert"
data-toggle="dropdown"
data-toggle="button"
data-toggle="buttons-checkbox"
data-toggle="buttons-radio"
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协同过滤算法(Collaborative Filtering)是一种经典的推荐算法,其基本原理是“协同大家的反馈、评价和意见,一起对海量的信息进行过滤,从中筛选出用户可能感兴趣的信息”。它主要依赖于用户和物品之间的行为关系进行推荐。 协同过滤算法主要分为两类: 基于物品的协同过滤算法:给用户推荐与他之前喜欢的物品相似的物品。 基于用户的协同过滤算法:给用户推荐与他兴趣相似的用户喜欢的物品。 协同过滤算法的优点包括: 无需事先对商品或用户进行分类或标注,适用于各种类型的数据。 算法简单易懂,容易实现和部署。 推荐结果准确性较高,能够为用户提供个性化的推荐服务。 然而,协同过滤算法也存在一些缺点: 对数据量和数据质量要求较高,需要大量的历史数据和较高的数据质量。 容易受到“冷启动”问题的影响,即对新用户或新商品的推荐效果较差。 存在“同质化”问题,即推荐结果容易出现重复或相似的情况。 协同过滤算法在多个场景中有广泛的应用,如电商推荐系统、社交网络推荐和视频推荐系统等。在这些场景中,协同过滤算法可以根据用户的历史行为数据,推荐与用户兴趣相似的商品、用户或内容,从而提高用户的购买转化率、活跃度和社交体验。 未来,协同过滤算法的发展方向可能是结合其他推荐算法形成混合推荐系统,以充分发挥各算法的优势。
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