2 Dictionary/membership Problem
نویسنده
چکیده
In dictionary/membership problem, we want to keep a set S of n items from a universe U with possibly some extra information associated with each one of them. For the membership problem, the goal is to create a data structure that allows us to ask whether a given item x is in S or not. For a dictionary, the data structure should also return the information associated with x. For example, S can be a set of Swahili words such that each of the words is associated with a piece of text which describes its meaning. (Duh!)
منابع مشابه
2 Dictionary/membership Problem 3 Hashing with Chaining
In dictionary/membership problem, we want to keep a set S of items with possibly some extra information associated with each one of them. (From now on, we denote the number of elements in S by n.) For the membership problem, the goal is to create a data structure that allows us to ask whether a given item x is in S or not. For a dictionary, the data structure should also return the infomation a...
متن کاملCSE 521 Winter 2006 Notes on Hashing
The dictionary data structure is ubiquitous in computer science. A dictionary holds a set of items from an ordered universe and supports the operations of inserting an item, deleting an item, and searching for an item (membership queries). This is the dynamic dictionary problem. If the set of items is fixed and never changes, we only need to efficiently support membership queries (of the form “...
متن کاملEntity Recognition in a Web Based Join Structure
Given a document, the task of Entity Recognition is to identify predefined entities such as person names, products, or locations in this document. With a potentially large dictionary, this entity recognition problem transforms into a Dictionary-based Membership Checking problem called Approximate Membership Extraction (AME) which aims at finding all possible substrings from a document that matc...
متن کاملApproximate Membership of Sets: A Survey
The task of representing a set so as to support membership queries is a common one in computer science. If space is no object, a complete dictionary may provide accurate QUERYing in good runtime. If space is at a premium and the size of the set uncertain, Bloom filters and hash compaction provide good approximations. If the size is completely unknown, a modified Bloom filter provides very good ...
متن کاملFuzzy Logic in the Wavelet Framework
The translation of knowledge contained in databank into linguistically interpretable fuzzy rules has proven in real applications to be difficult. A solution to this problem is furnished by multiresolution techniques. A dictionary of functions forming a multiresolution is used as candidate membership functions. The membership functions are chosen among the family of scaling functions that have t...
متن کامل