Netflix-recommendation-system

NLP, Machine learning

About

Recommendation algorithms are at the core of the Netflix product. It provides their members with personalized suggestions to reduce the amount of time and frustration to find something great content to watch. Because of the importance of our recommendations, they continually seek to improve them by advancing the state-of-the-art in the field. They do this by using the data about what content our members watch and enjoy along with how they interact with our service to get better at figuring out what the next great movie or TV show for them will be.

Types

The categories under "Trending Now" and "New Releases" are Non-Personalized Recommendation System
The categories under "Because you watched" are Personalized Recommendation System

NLP

Natural language processing is a subfield of linguistics, computer science, and artificial intelligence concerned with the interactions between computers and human language, in particular how to program computers to process and analyze large amounts of natural language data.

#1 Tokenization

Tokenization is the process of breaking down sentence or paragraphs into smaller chunks of words called tokens.

#2 Stop Words Removal

On removal of some words, the meaning of the sentence doesn't change, like and, am. Those words are called stop-words and should be removed before feeding to any algorithm. In datasets, some non-stop words repeat very frequently. Those words too should be removed to get an unbiased result from the algorithm.

#3 Vectorization

After tokenization, and stop words removal, our "content" are still in string format. We need to convert those strings to numbers based on their importance (features). We use TF-IDF vectorization to convert those text to vector of importance. With TF-IDF we can extract important words in our data. It assign rarely occurring words a high number, and frequently occurring words a very low number.