{'fraction_non_alphanumeric': 0.021956087824351298, 'fraction_numerical': 0.0, 'mean_word_length': 5.3544303797468356, 'pattern_counts': {'":': 0, '<': 0, '<?xml version=': 0, '>': 0, 'https://': 0, 'lorem ipsum': 0, 'www.': 0, 'xml': 0}, 'pii_count': 0, 'substrings_counts': 0, 'word_list_counts': {'cursed_substrings.json': 0, 'profanity_word_list.json': 0, 'sexual_word_list.json': 0, 'zh_pornsignals.json': 0}}
Complete formal model for information retrieval systems

What should the components of a model of an information retrieval system be? The answer to this question is not easy, because the term ‘information retrieval system’ has had a changing referent. In the early days of computer-based retrieval, information retrieval systems worked with document representations consisting of simple lists of keywords. Today, the information retrieved may be from full-text or hypertext or even hypermedia systems.