Analysis: Information retrieval of elective courses is the main way for users to query and obtain information, and it is also the method and means to find information. By using certain methods and retrieval tools, we can find out the search process of the required information from the information collection. Information retrieval originated from reference service and abstract indexing in libraries.
The process of processing, sorting, organizing and storing information in a certain way, and then accurately finding out relevant information according to the specific needs of information users. Also known as information storage and retrieval. Generally speaking, information retrieval refers to information retrieval in a broad sense.
Related definitions:
According to the principle of information retrieval, information storage is the basis of information retrieval. The information stored here includes not only the original document data, but also pictures, videos and audio. First of all, these original information should be converted into computer language and stored in the database, otherwise machine recognition cannot be carried out.
After the user inputs the query request according to the intention, the retrieval system searches the database for information related to the query according to the user's query request, calculates the similarity of the information through a certain matching mechanism, and converts the information into output in descending order.