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the Panda update, which cracked down on content farms and pages with high amounts of ads. More updates followed, with Venice integrating more local search data, Penguin adjusting more spam factors, Exact-Match Domain Up- date which changed how it handled exact match domains, and the Payday Loan update, which focused on spammy sites such as payday loans and porn. The update Hummingbird in August 2013 was a core algorithm update, and then Pigeon updated how it handled local results. In April 2013, Google re- leased the Mobile-Friendly Update, which separated mobile rankings for web- sites with mobile friendly sites, and then the Quality update was a core algorithm change. In October 2015, Google announced that they had had an update called RankBrain, which incorporated machine learning into the algorithm. There have been many other minor updates to Google as it continues to improve its service. Google has put much work into improving their search engine, a large part of which was combating spam and other methods of search engine manipulation. Other changes have addressed improving the precision of the results in regards to the search terms used, or in regards to the location of the searcher. Through- out all of these updates, the PageRank algorithm has remained an important part of the search engine. 4.2 Optimization of PageRank The PageRank algorithm is an effective method for ranking importance in a link-based structure. However, it can have many issues, including a high com- putational cost in large structures, and its vulnerabilities to manipulations. There has been much work investigating these issues. 18PDF Image | MATHEMATICS BEHIND GOOGLE PAGERANK ALGORITHM
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