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Yenta. Kenny Rivera - Tester Becky Tang – System Architect Shylah Weber – Systems Integrator Anthony Yim – Project Manager. A Simple Recommendation Language. Definition. Yenta 1) Yiddish word which describes an old woman who is a matchmaker - a Yentle. (Ref. Fiddler on the Roof)
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Yenta Kenny Rivera - TesterBecky Tang – System ArchitectShylah Weber – Systems IntegratorAnthony Yim – Project Manager A Simple Recommendation Language
Definition Yenta 1) Yiddish word which describes an old woman who is a matchmaker - a Yentle. (Ref. Fiddler on the Roof) 2) In modern use the meaning has become that of an annoying old hag. (http://www.urbandictionary.com)
Motivation Recommendation engines are becoming increasingly popular We wanted to make recommendations: • Fast • Simple to program • Flexible in content
Overview Imperative language Yenta allows recommendations based on either of the following input: • A “seed” or example piece of data • A set of criteria or “tags”
Syntactic Constructs • Sample Yenta program: • Built-in subroutines (3 main steps) • import(string fileName) • applyBasicScore(string tag, string tagValue, double weight, . . . ) • printTop(int n) • Java-like declarations of primitive types • file type file myMusicFile = import("music.txt"); myMusicFile.applyScore("Year", ”2006", "0.8", "Genre", "Pop", "0.2"); myMusicFile.printTop(3);
Equivalent Java Code for Import() public void importFile(Stringfilename)throwsIOException{ BufferedReader in = new BufferedReader(newFileReader(filename)); BufferedReader in2 = new BufferedReader(newFileReader(filename)); String line = in.readLine(); String lineCopy = line; rows = 0; while (line != null){ rows++; line = in.readLine(); } StringTokenizerst = new StringTokenizer(lineCopy, ”\t"); cols = 0; while(st.hasMoreTokens()){ st.nextToken(); cols++; } tags = new Tag[cols]; line = in2.readLine(); StringTokenizer st3 = new StringTokenizer(line, ”\t"); for(intk = 0; (k < cols) && st3.hasMoreTokens(); k++){ tags[k] = new Tag(st3.nextToken()); tags[k].col = k; } rows--; file = new String[rows][cols]; line = in2.readLine(); inti = 0; while (line != null){ StringTokenizer st2 = new StringTokenizer(line, ”\t"); intj = 0; while(st2.hasMoreTokens()){ file[i][j] = st2.nextToken(); j++; } i++; line = in2.readLine(); } scores = new double[rows]; } Yikes!
Other Syntactic Constructs • Flow control • for loops • if statements • Other types • int • double • string (seen) • scoreFunc
Translator Architecture Yenta Program Main Java compiler Main.java Java interpreter Java file representing the Yenta program Java compiler Java program Java interpreter Yenta Output
Translator Architecture YentaProg.txt Main Java compiler Main.java Java interpreter YentaProg.java javac Main.java java Main < YentaProg.txt javac YentaProg.java java YentaProg Java compiler YentaProg Java interpreter Yenta Output
Interpreter Implementation • Wrote Java methods that are always in the output file • Our grammar simply calls these methods with the programmer’s parameters
Development Environment + + +
Tools ANTLR v3 • Parser + Lexer • Takes a LL(*) grammar as input. • “Spits out” tokens as output. Example ANTLR grammar
Tools ANTLRWorks parse tree
Tools StringTemplate example StringTemplate Outputs… Equiv. Java code that was “printed” out.
The Proposed Test Suite • Unit testing • Grammar was constructed based on several programs designed to exploit key features • Advantages: • Provides strict guidelines that code must satisfy. • Unit testing finds problems early in development • Fuzz testing • Provides random data to our example programs to test for errors and inconsistencies
Advantages Yenta is a simple, easy-to-use language that is: • Easy to learn • Fast to write • Concise, easy-to-read code • Can be used by beginners but also augmented by more advanced features
Advantages Yenta’s primary advantage is that it can be used to recommend anything a programmer wishes (Like Columbia classes!)
