My Notes on System Design

Introduction to System Design

Systems design is the process of defining the architecture, product design, modules, interfaces, and data for a system to satisfy specified requirements. Systems design could be seen as the application of systems theory to product development.

tf(“term1”, doc_i) = term1_count/ words_count

idf(“term1”) = log(N / nt)

N - Number of documents nt - Number of documents containing the term1

for(Document doc in documents) { doc.score = tf(“term1”, doc_i) * idf(“term1”) + tf(“term2”, doc_i) * idf(“term2”) —- + tf(“termN”, doc_i) * idf(“termN”) }

TF-IDF Term Frequency - Inverse Document Frequency
<!DOCTYPE html> 
<html lang="en"> 
    ...
    <div class="jumbotron"> 
        <h1>Hello, world!</h1> 
        <p>...</p> 
        <p><a class="btn btn-primary btn-lg" href="#" role="button">Learn more</a></p> 
    </div>
    <div class="jumbotron"> 
        <h1>Hello, world!</h1> 
        <p>...</p> 
        <p><a class="btn btn-primary btn-lg" href="#" role="button">Learn more</a></p> 
    </div>
    ...
</html>