Information retrieval

1. Elements of information retrieval

Element s of information retrieval 

The key elements of information retrieval (IR) are:

1. Document Representation: The process of converting raw data into a format that can be easily indexed and searched. This often involves text processing techniques such as tokenization, stemming, and lemmatization.

2. Indexing: Creating a data structure that allows for quick retrieval of documents. This typically involves building an inverted index, which maps terms to the documents in which they appear.

3. Query Processing: Interpreting and refining the user’s search query to make it suitable for the IR system. This may include techniques like query expansion, spell correction, and natural language processing.

4. Search and Retrieval: The core function of the IR system where it searches the indexed documents to find those that match the user’s query. This involves algorithms for matching and ranking documents.

5. Ranking: Ordering the search results based on their relevance to the query. Ranking algorithms may consider factors such as term frequency, document length, and more advanced measures like PageRank .