diff --git a/hws/amazon_prime/README.md b/hws/amazon_prime/README.md new file mode 100644 index 0000000..8cf5854 --- /dev/null +++ b/hws/amazon_prime/README.md @@ -0,0 +1,261 @@ +# Homework 3 — Completing a Simple Amazon Prime Video Recommendation System + +In this assignment you will complete the implementation of a simple recommendation system called New York Recommender. Your program will mimic some behaviors of the Amazon Prime Video Recommendation System. Please read the entire handout before starting to code the assignment. + +## Learning Objectives + +- Practice managing dynamic memory. +- Practice using two-dimensional arrays. + +**Note**: in this README, we use the term two-dimensional array and the term matrix interchangeably, as in this assignment, we assume these two terms have the same meaning. + +## Background + +Amazon Prime Video recommends movies and tv shows to prime users. Prime users on the prime video page will see things like this: + +![alt text](images/movies.png "Amazon Prime Movies") + +and this: + +![alt text](images/shows.png "Amazon Prime Shows") + +In this assignment, you will be completing a program which aims to implement these two features: recommending movies and recommending tv shows to users. + +## Specification + +In this assignment we assume there are 500 users in total, and we index these users from 0 to 499. + +We assume there are 110 movies in total, indexed from 0 to 109. + +We assume there are 100 tv shows in total, indexed from 0 to 99. + +The index and the name of all the movies and shows are hardcoded in the [main.cpp](main.cpp), just so you do not need to parse more input files. + +You are required to define a class named **RecommendationSystem**. The class definition goes to recommendation.h and the implementation of the class goes to [recommendation.cpp](recommendation.cpp), which is provided but is incomplete. Your class must have (at least) two member variables, one is named userMovieRatingsMatrix, the other is named userShowRatingsMatrix, both are two-dimensional *int* pointers, i.e., int\*\*. Two member functions to your class are provided, and you can call but should not modify these two functions. + +## Input Files + +Two input files are provided: [movieRatings.txt](movieRatings.txt) and [showRatings.txt](showRatings.txt). The two files have the same format. For example, the following is the first few lines of the [movieRatings.txt](movieRatings.txt): + +```console +(87,3) (11,1) (14,1) (31,4) (101,4) (21,2) (23,1) (3,4) (38,5) (100,2) (109,1) (80,4) (15,3) (71,5) (52,5) (67,2) (78,2) (69,3) (72,2) (93,4) (35,3) (102,4) (81,4) (107,4) (79,4) (58,1) (105,5) (90,2) (6,3) (9,3) (53,4) (59,2) (62,2) (94,2) (54,2) (85,3) (57,5) (5,4) (32,4) (39,2) (42,2) +(6,1) (61,2) (109,2) (87,4) (28,4) (38,5) (22,4) (11,2) (59,4) (68,3) (33,5) (71,3) (72,4) (15,4) (49,3) (94,1) (55,1) +(76,3) (33,1) (78,4) (65,4) (62,4) (73,5) (1,4) (105,2) (34,4) (18,4) (75,4) (99,4) (94,1) (83,3) (14,5) (85,2) (26,4) (15,4) (21,4) (69,1) (10,4) (81,1) (22,3) (61,2) (7,2) (25,2) (43,4) (70,2) (6,5) (0,2) (38,4) (95,5) (107,4) (72,4) (49,2) (90,2) (2,4) (88,3) (104,2) (23,3) (97,5) (56,4) (58,4) (57,5) (100,1) (37,4) (80,4) (96,4) (42,4) (77,5) (3,1) (46,1) (29,3) (19,5) (103,5) +(26,4) (57,4) (84,5) (60,4) (70,2) (99,3) (87,5) (94,1) (81,4) (16,2) (67,2) (36,2) (103,4) (28,1) (97,4) (73,5) (45,1) (37,4) (13,2) (17,4) (11,5) (66,2) (10,4) (85,1) (51,5) (96,4) (4,4) (21,5) (9,2) (74,5) (50,3) (104,3) (15,2) (35,5) (101,1) (102,4) (77,5) (62,1) (34,4) (71,5) (20,5) (46,1) (44,1) (90,1) (49,1) (2,4) (80,3) (95,1) (24,5) (98,3) (8,3) (14,3) (47,1) (32,3) (29,1) (18,4) (63,4) (40,3) (59,2) (69,5) (100,1) (107,3) (55,4) (0,4) +(69,4) (63,2) (32,5) (31,4) (74,2) (46,1) (99,4) (26,4) (90,4) (89,1) (58,1) (27,5) (29,2) (7,4) (65,3) (60,5) (23,1) (97,4) (53,4) (39,5) (87,5) (47,3) (8,4) (15,1) (102,3) (35,4) (106,4) (73,5) (98,4) (42,4) (66,5) (76,1) (104,2) (94,1) (77,1) (56,4) (109,4) (54,4) (103,2) (71,2) (25,4) (92,5) (24,4) (52,4) (34,4) (14,3) (55,2) (22,4) (80,2) (44,2) (4,4) (75,3) (13,4) (91,4) (61,3) (82,1) (84,3) (28,2) (51,3) (30,4) (85,5) (62,4) (86,4) (70,4) (43,5) (33,4) (107,2) (64,5) (108,4) (9,3) (88,3) (11,1) +(10,4) (38,1) (0,4) (20,1) (41,3) (94,1) (64,5) (71,1) (22,4) (34,3) (96,1) (46,3) (50,5) (39,2) (109,4) (82,1) (65,5) (2,3) (37,4) (44,3) (69,1) (105,4) (30,4) (29,3) +(11,4) (98,2) (76,2) (50,2) (35,3) (16,1) (18,5) (70,4) (30,5) (3,2) (90,2) (36,1) (83,4) (102,2) (105,4) (49,4) (94,1) (85,2) (20,3) (107,1) (28,1) (48,2) (12,2) (15,4) +(67,3) (27,4) (58,2) (6,3) (42,5) (63,3) (0,5) (49,4) (53,4) (66,3) (17,2) (41,2) (90,1) (84,4) (83,4) (46,1) (22,4) (13,2) (15,1) (75,1) (11,4) (62,4) (102,4) (35,1) (5,5) (69,4) (81,3) (93,4) (44,1) (59,5) (31,4) (8,3) (47,5) (106,3) (7,1) (61,3) (51,3) (99,1) (54,1) (32,3) (78,4) (72,3) (24,1) (48,4) (40,4) (97,4) (74,2) (33,1) (26,3) (68,5) (95,4) (64,4) (4,3) (25,4) (103,3) (52,5) (65,5) (30,4) (28,2) (39,4) (18,2) (73,1) (105,3) (45,4) (38,2) (23,4) (16,2) (21,4) (2,4) (9,5) (77,2) (82,2) (19,3) +(82,1) (83,4) (64,1) (98,3) (94,2) (4,1) (38,5) (90,5) (31,1) (2,5) (61,1) (102,3) (103,1) (45,4) (89,4) (1,2) (85,4) (63,2) (49,4) (77,4) (28,1) (91,4) (8,4) (53,5) (46,4) (23,4) (73,2) (104,5) (62,4) (66,4) (25,2) (44,4) (9,1) (30,1) (29,1) (108,1) (48,1) (52,4) (76,1) (92,4) (15,3) (101,4) (59,1) (32,4) (22,2) (33,3) (21,2) (35,4) (65,2) (109,1) (69,5) (27,4) +(101,4) (37,2) (24,1) (0,4) (63,2) (71,5) (64,3) (2,4) (65,1) (45,4) (7,4) (50,2) (81,2) (93,1) (42,5) (83,4) (29,2) (21,2) (51,5) (86,4) (82,1) (108,2) (23,4) (40,2) (89,4) (88,3) (78,5) (107,4) (9,3) (56,5) (60,5) (46,5) (44,4) (67,3) (18,3) (10,4) (103,1) (8,5) (34,3) (12,5) (96,5) (35,2) (68,3) (61,1) (58,1) (20,3) (100,4) (97,4) (47,5) (95,1) (92,4) (32,5) (27,5) (52,4) (25,4) (5,4) (85,4) (57,2) (30,3) (76,4) (72,5) (1,5) +``` + +Each line is representing one user. Each user uses the Amazon star rating (as shown in the following image) to rate a movie or a tv show (in the range of 1 to 5). + +![alt text](images/starRatings.png "Amazon Star Rating") + +The first line of [movieRatings.txt](movieRatings.txt) means, user 0 gives a rating of 3 to movie 87, gives a rating of 1 to movie 11, gives a rating of 1 to movie 14, gives a rating of 4 to moving 31, gives a rating of 4 to movie 101, gives a rating of 2 to movie 21, etc. + +The second line of [movieRatings.txt](movieRatings.txt) means, user 1 gives a rating of 1 to movie 6, gives a rating of 2 to movie 61, gives a rating of 2 to movie 109, gives a rating of 4 to moving 87, gives a rating of 4 to movie 28, gives a rating of 5 to movie 38, etc. + +The 3rd line descirbes ratings given by user 2, the 4th line describes ratings given by user 3, etc. + +The file [showRatings.txt](showRatings.txt) can be interpreted in the same way. It is just ratings in that file are for tv shows. In this assignment, your program should read these two input files and store the movie ratings in a matrix, and store the show ratings in another matrix. + +## Commands to Support & Program Output + +Your program only needs to support one command: + +```console +nyrecommender.exe movieRatings.txt showRatings.txt output.txt userID numRecommendations +``` + +Here + +- movieRatings.txt is the movie rating input file, already described above. +- showRatings.txt is the show rating input file, already described above. +- output.txt is where to print your output. +- userID specifies the ID of the user. +- numRecommendations specifies how many movies/shows your program will recommend to the user. For example, if numRecommendation is 5, then your program should try to print up to 5 movies and up to 5 tv shows. + +When your program is executed, it produces up to numRecommendations recommended movies to the output file, and also produces up to numRecommendation recommended tv shows to the output file. Following is a sample output file: + +```console +Prime: Movies we think you'll like: +Elvis +The Shawshank Redemption +The Godfather +Schindler's List +Forrest Gump +Prime: TV shows we think you'll like: +Little Women +Game of Thrones +The Simpsons +Friends +The Crown +``` + +Note that these recommendations are specifically for this user - as specified by the command line argument userID. Apparently your program will produce different recommendations for different users. + +1. in the case where the number of command line arguments is not 6, your program should use std::cerr to print the following message: + +```console +Usage: nyrecommender.exe movieRatings.txt showRatings.txt output.txt userID numRecommendations + +``` + +Nothing should be printed to the output file in such a case. + +2. in the case where the userID command line argument is not in the range of 0-499, your program should use std::cerr to print the following error message: + +```console +Invalid User ID. + +``` + +Nothing should be printed to the output file in such a case. + +3. in the case where the *numRecommendations* command line argument is 0, your program should produce the output file which contains the following message: + +```console +Prime: Movies we think you'll like: +Prime: TV shows we think you'll like: + +``` + +**Note**: All expected output files are provided in this repository. All the expected output files contain an empty line at the very end, to match with that, you just need to make sure all your print statements end with *std::endl;* (or just *endl;* if you don't use *std::*). + +## Provided Code + +Two cpp files are provided: [main.cpp](main.cpp) and [recommendation.cpp](recommendation.cpp). These two files are incomplete, and you should add your code into these two files. In addition, you should create the recommendation.h file, in which you define the **RecommendationSystem** class. + +### Existing Code in [main.cpp](main.cpp) + +A helper function named *process_one_line* is provided in the [main.cpp](main.cpp) file. + +```cpp +void process_one_line(int** matrix, int i, std::string& line){ + std::istringstream iss(line); + // process each (index, value) pair + int index, value; + char openParen, comma, closeParen; + // when used with integers, it reads characters until it encounters a non-digit character or whitespace. However, when used with characters, it reads a single character. + while (iss >> openParen >> index >> comma >> value >> closeParen) { + matrix[i][index] = value; + } +} +``` + +This function will help you to parse information from the input file, and update the matrix. This function takes three arguments, the first argument is a two-dimensional integer pointer, also known as the matrix pointer, which is expected to point to the beginning memory location of a two-dimensional array. This function assumes the caller allocates and reclaims memory for matrix - **it also assumes that every element of the matrix is initialized to 0**. The second argument is the index i, indicating which row of the matrix will be updated. The third argument is the string line, which represents one line of the input file. + +To understand what this function does, let's take the first line of the [movieRatings.txt](movieRatings.txt) as an example. + +```console +(87,3) (11,1) (14,1) (31,4) (101,4) (21,2) (23,1) (3,4) (38,5) (100,2) (109,1) (80,4) (15,3) (71,5) (52,5) (67,2) (78,2) (69,3) (72,2) (93,4) (35,3) (102,4) (81,4) (107,4) (79,4) (58,1) (105,5) (90,2) (6,3) (9,3) (53,4) (59,2) (62,2) (94,2) (54,2) (85,3) (57,5) (5,4) (32,4) (39,2) (42,2) +``` + +We know this first line represents movie ratings given by user 0. If this above line is stored in the *line* argument as an std::string, passed to the *process_one_line* function, then this function will set: + +- matrix[0][87] to 3 // it's the first row, and that corresponds to matrix[0], and the rating to movie 87 is 3. +- matrix[0][11] to 1 +- matrix[0][14] to 1 +- matrix[0][31] to 4 +- matrix[0][101] to 4 +- matrix[0][21] to 2 +- etc. + +Let's present one more example, the following is the second line of the [movieRatings.txt](movieRatings.txt): + +```console +(6,1) (61,2) (109,2) (87,4) (28,4) (38,5) (22,4) (11,2) (59,4) (68,3) (33,5) (71,3) (72,4) (15,4) (49,3) (94,1) (55,1) +``` + +When feeding this line to the *process_one_line* function, it will set: + +- matrix[1][6] to 1 // it's the second row, and that corresponds to matrix[1], and the rating to movie 6 is 1. +- matrix[1][61] to 2 +- matrix[1][109] to 2 +- matrix[1][87] to 4 +- matrix[1][28] to 4 +- matrix[1][38] to 5 +- etc. + +In addition to this *process_one_line* function, the [main.cpp](main.cpp) also defines two global arrays, one array is named movies, which stores the index and the name of all the movies; the other array is named tvShows, which stores the index and the name of all the tv shows. + +### Existing Code in [recommendation.cpp](recommendation.cpp) + +Two member functions of the **RecommendationSystem** class are provided in the [recommendation.cpp](recommendation.cpp) file. You can use these two functions without understanding the internal of these two functions, but we will go over the internal of these two functions in lecture, just to satisfy some students' curiosity of how movies and tv shows are actually recommended. More specifically, how does Amazon or Netflix know which movies or tv shows I like? The detailed answer to this question is beyond the scope of this course, but we will still discuss it in lecture. To complete this assignment, you just need to know how to call these two functions and what these two functions return. + +The prototype of these two functions are: + +```cpp +void RecommendationSystem::recommendMovies(int userId, int numRecommendations, int* recommendedMovies) const; +void RecommendationSystem::recommendShows(int userId, int numRecommendations, int* recommendedShows) const; +``` + +The first function returns an integer array, representd by its third argument - *int\* recommendedMovies*. Each element of this array is an index of a movie that will be recommended to the user. It is the caller's responsibility to allocate and reclaim memory for this array. + +The second function returns an integer array, representd by its third argument - *int\* recommendedShows*. Each element of this array is an index of a tv show that will be recommended to the user. It is the caller's responsibility to allocate and reclaim memory for this array. + +These two functions assume the **RecommendationSystem** class has these two member variables, + +```cpp +int** userMovieRatingsMatrix; +int** userShowRatingsMatrix; +``` + +where *userMovieRatingsMatrix* points to the memory location for the movie rating matrix, and *userShowRatingsMatrix* points to the memory location for the tv show rating matrix. + +The first argument (*int userId*) of these two functions is the user id, which represents the user whom the movies or the shows will be recommended to. + +The second argument (*int numRecommendations*) of these two functions is the number of recommendations, meaning how many movies or how many tv shows will be recommended to the user. The two functions are very similar, and here we will just describe the first function, i.e., *RecommendationSystem::recommendMovies*. The function *RecommendationSystem::recommendMovies* will use some algorithm to find movies which the user might like, it will then store the index of these movies in the array represented by *recommendedMovies*. Ideally, the size of this array is equal to *numRecommendations*, and by the time this function returns, every element of the array should contain a valid index. However, it is possible there are not enough number of movies which the algorithm thinks the user might like. In order to handle such a case, this function expects the caller to allocate memory for the array and also initialize every element of the array to be *-1*. And when this function returns, the caller should check which element's value is not *-1*, and only consider these elements as the valid index, and ignore the elements whose value is *-1*. You can assume all valid indices are stored at the beginning of the array, and all *-1*s (if any) are stored at the end of the array. For example, if *numRecommendations* is 5, but the algorithm only finds 3 movies the user might like, and if the index of these 3 movies are 20, 40, 60, respectively, then the array returned by this function will be: + +```console +[20, 40, 60, -1, -1] +``` + +On the other hand, if *numRecommendations* is 5, but the algorithm finds 20 movies the user might like, the function would only return 5 indices. In other words, the function will never return more than *numRecommendations* indices. + +In addition, the two functions also assume the **RecommendationSystem** class has defined the number of users, the number of movies, the number of tv shows as its member variables, named numUsers, numMovies, numShows, respectively. + +## Program Requirements & Submission Details + +In this assignment, **you are NOT allowed to use std::vector anywhere in your code**. You must use dynamic memory to store the movie rating matrix, and the show rating matrix. + +Use good coding style when you design and implement your program. Organize your program into functions: +don’t put all the code in main! Be sure to read the [Homework Policies](https://www.cs.rpi.edu/academics/courses/spring24/csci1200/homework_policies.php) as you put the finishing touches on your solution. Be sure to make up new test cases to fully debug your program and don’t forget +to comment your code! Use the provided template [README.txt](./README.txt) file for notes you want the grader to read. +You must do this assignment on your own, as described in the [Collaboration Policy & Academic Integrity](https://www.cs.rpi.edu/academics/courses/spring24/csci1200/academic_integrity.php) page. If you did discuss the problem or error messages, etc. with anyone, please list their names in your +README.txt file. + +**Due Date**: 02/08/2024, Thursday, 10pm. + +## Rubric + +18 pts + + - README.txt Completed (3 pts) + - One of name, collaborators, or hours not filled in. (-1) + - Two or more of name, collaborators, or hours not filled in. (-2) + - No reflection. (-1) + - OVERALL CLASS DECLARATION & IMPLEMENTATION AND CODING STYLE (8 pts) + - No credit (significantly incomplete implementation) (-8) + + - Improper uses or omissions of const and reference. (-1) + - Function bodies containing more than one statement are placed in the .h file. (okay for templated classes) (-2) + - Functions are not well documented or are poorly commented, in either the .h or the .cpp file. (-1) + - At least one function is excessively long (i.e., more than 200 lines). (-1) + - Overly cramped, excessive whitespace, or poor indentation. (-1) + - Poor file organization: Puts more than one class in a file (okay for very small helper classes) (-1) + - Poor choice of variable names: non-descriptive names (e.g. 'vec', 'str', 'var'), single-letter variable names (except single loop counter), etc. (-2) + - DATA REPRESENTATION (Must use dynamic memory for the implementation.) (7 pts) + - No credit (significantly incomplete implementation). (-7) + - Does not define the RecommendationSystem class. (-5) + - Does not use dynamic memory to store the movie rating matrix. (-5) + - Does not use dynamic memory to store the show rating matrix. (-5) + - Uses std::vector anywhere in the code. (-7) + - Member variables are public. (-2) + diff --git a/hws/amazon_prime/README.txt b/hws/amazon_prime/README.txt new file mode 100644 index 0000000..ca52a40 --- /dev/null +++ b/hws/amazon_prime/README.txt @@ -0,0 +1,36 @@ +HOMEWORK 3: Amazon Prime Video Recommendation + + +NAME: < insert name > + + +COLLABORATORS AND OTHER RESOURCES: +List the names of everyone you talked to about this assignment +(classmates, TAs, ALAC tutors, upperclassmen, students/instructor via +LMS, etc.), and all of the resources (books, online reference +material, etc.) you consulted in completing this assignment. + +< insert collaborators / resources > + +Remember: Your implementation for this assignment must be done on your +own, as described in "Academic Integrity for Homework" handout. + + +ESTIMATE OF # OF HOURS SPENT ON THIS ASSIGNMENT: < insert # hours > + + +MISC. COMMENTS TO GRADER: +(optional, please be concise!) + + +## Reflection and Self Assessment + +Discuss the issues you encountered during development and testing. What +problems did you have? What did you have to research and learn on your +own? What kinds of errors did you get? How did you fix them? + +What parts of the assignment did you find challenging? Is there anything that +finally "clicked" for you in the process of working on this assignment? How well +did the development and testing process go for you? + +< insert reflection > diff --git a/hws/amazon_prime/images/movies.png b/hws/amazon_prime/images/movies.png new file mode 100644 index 0000000..13bd01b Binary files /dev/null and b/hws/amazon_prime/images/movies.png differ diff --git a/hws/amazon_prime/images/shows.png b/hws/amazon_prime/images/shows.png new file mode 100644 index 0000000..23b2af6 Binary files /dev/null and b/hws/amazon_prime/images/shows.png differ diff --git a/hws/amazon_prime/images/starRatings.png b/hws/amazon_prime/images/starRatings.png new file mode 100644 index 0000000..21115cd Binary files /dev/null and b/hws/amazon_prime/images/starRatings.png differ diff --git a/hws/amazon_prime/main.cpp b/hws/amazon_prime/main.cpp new file mode 100644 index 0000000..a9a7fe2 --- /dev/null +++ b/hws/amazon_prime/main.cpp @@ -0,0 +1,248 @@ +#include +#include "recommendation.h" + +class Movie { +public: + int movieId; + std::string title; +}; + +class TVShow { +public: + int tvShowId; + std::string title; +}; + +// Oscar-winning movies +Movie movies[] = { + {0, "Elvis"}, + {1, "The Shawshank Redemption"}, + {2, "The Godfather"}, + {3, "Schindler's List"}, + {4, "The Lord of the Rings: The Return of the King"}, + {5, "Forrest Gump"}, + {6, "Titanic"}, + {7, "Gladiator"}, + {8, "The Departed"}, + {9, "12 Years a Slave"}, + {10, "Green Book"}, + {11, "The Silence of the Lambs"}, + {12, "The Sound of Music"}, + {13, "Amadeus"}, + {14, "The Shape of Water"}, + {15, "Braveheart"}, + {16, "The English Patient"}, + {17, "Moonlight"}, + {18, "Argo"}, + {19, "Birdman"}, + {20, "No Country for Old Men"}, + {21, "A Beautiful Mind"}, + {22, "Spotlight"}, + {23, "The King's Speech"}, + {24, "Platoon"}, + {25, "Dances with Wolves"}, + {26, "Gandhi"}, + {27, "The Green Mile"}, + {28, "The Pianist"}, + {29, "The Bridge on the River Kwai"}, + {30, "West Side Story"}, + {31, "The Godfather: Part II"}, + {32, "Crouching Tiger, Hidden Dragon"}, + {33, "The Hurt Locker"}, + {34, "Slumdog Millionaire"}, + {35, "Million Dollar Baby"}, + {36, "Rain Man"}, + {37, "Rocky"}, + {38, "Inception"}, + {39, "Chariots of Fire"}, + {40, "The Great Gatsby"}, + {41, "All About Eve"}, + {42, "One Flew Over the Cuckoo's Nest"}, + {43, "The Apartment"}, + {44, "The French Connection"}, + {45, "The Grand Budapest Hotel"}, + {46, "Rebecca"}, + {47, "Gone with the Wind"}, + {48, "Casablanca"}, + {49, "Ben-Hur"}, + {50, "Lawrence of Arabia"}, + {51, "The Phantom of the Opera"}, + {52, "The Godfather: Part III"}, + {53, "Annie Hall"}, + {54, "Out of Africa"}, + {55, "My Fair Lady"}, + {56, "The Life of Emile Zola"}, + {57, "On the Waterfront"}, + {58, "The Best Years of Our Lives"}, + {59, "The Deer Hunter"}, + {60, "Midnight Cowboy"}, + {61, "American Beauty"}, + {62, "Gigi"}, + {63, "Going My Way"}, + {64, "Gentleman's Agreement"}, + {65, "From Here to Eternity"}, + {66, "Oliver!"}, + {67, "Patton"}, + {68, "The Artist"}, + {69, "The Family Plan"}, + {70, "A Man for All Seasons"}, + {71, "Lincoln"}, + {72, "The Greatest Show on Earth"}, + {73, "An American in Paris"}, + {74, "Kramer vs. Kramer"}, + {75, "The Descendants"}, + {76, "Driving Miss Daisy"}, + {77, "All Quiet on the Western Front"}, + {78, "The Greatest Showman"}, + {79, "Mutiny on the Bounty"}, + {80, "The Lost Weekend"}, + {81, "The Batman"}, + {82, "Aquaman and the Lost Kingdom"}, + {83, "Parasite"}, + {84, "Ordinary People"}, + {85, "Wonka"}, + {86, "Tom Jones"}, + {87, "The Last Emperor"}, + {88, "Don't Look Up"}, + {89, "Chicago"}, + {90, "The Revenant"}, + {91, "Darkest Hour"}, + {92, "Manchester by the Sea"}, + {93, "Hacksaw Ridge"}, + {94, "The Theory of Everything"}, + {95, "Midnight in Paris"}, + {96, "Coda"}, + {97, "Catch Me If You Can"}, + {98, "Nomadland"}, + {99, "The Graduate"}, + {100, "Pearl Harbor"}, + {101, "Dune"}, + {102, "King Richard"}, + {103, "Drive My Car"}, + {104, "The Fabelmans"}, + {105, "The Long Goodbye"}, + {106, "Nightmare Alley"}, + {107, "A Star is Born"}, + {108, "Top Gun: Maverick"}, + {109, "Everything Everywhere All at Once"}, +}; + +// Emmy Award-winning TV shows +TVShow tvShows[] = { + {0, "Little Women"}, + {1, "The West Wing"}, + {2, "The Sopranos"}, + {3, "Breaking Bad"}, + {4, "Game of Thrones"}, + {5, "The Twilight Zone"}, + {6, "The Simpsons"}, + {7, "Friends"}, + {8, "The Mary Tyler Moore Show"}, + {9, "M*A*S*H"}, + {10, "The Wire"}, + {11, "The Marvelous Mrs. Maisel"}, + {12, "The Crown"}, + {13, "Fleabag"}, + {14, "Stranger Things"}, + {15, "The Mandalorian"}, + {16, "Veep"}, + {17, "The Big Bang Theory"}, + {18, "Homeland"}, + {19, "The Handmaid's Tale"}, + {20, "The Office (U.S.)"}, + {21, "Cheers"}, + {22, "The Golden Girls"}, + {23, "I Love Lucy"}, + {24, "The Americans"}, + {25, "Sherlock"}, + {26, "Fargo"}, + {27, "The People v. O.J. Simpson: American Crime Story"}, + {28, "Black Mirror"}, + {29, "Westworld"}, + {30, "Mad Men"}, + {31, "The Boys"}, + {32, "Better Call Saul"}, + {33, "Hand of God"}, + {34, "The Good Place"}, + {35, "Atlanta"}, + {36, "Barry"}, + {37, "The Office (UK)"}, + {38, "Fawlty Towers"}, + {39, "Monty Python's Flying Circus"}, + {40, "The Daily Show with Jon Stewart"}, + {41, "Late Night with David Letterman"}, + {42, "The Tonight Show Starring Johnny Carson"}, + {43, "Saturday Night Live"}, + {44, "The X-Files"}, + {45, "Downton Abbey"}, + {46, "The Big C"}, + {47, "Six Feet Under"}, + {48, "Ray Donovan"}, + {49, "Curb Your Enthusiasm"}, + {50, "Keeping Up with the Kardashians"}, + {51, "The Twilight Zone (2002)"}, + {52, "Dexter"}, + {53, "House of Cards"}, + {54, "Boardwalk Empire"}, + {55, "The Newsroom"}, + {56, "Black-ish"}, + {57, "The Good Wife"}, + {58, "Parks and Recreation"}, + {59, "Pose"}, + {60, "This Is Us"}, + {61, "Watchmen"}, + {62, "The Office (U.K.)"}, + {63, "Vigil"}, + {64, "The Ellen DeGeneres Show"}, + {65, "True Detective"}, + {66, "The Cosby Show"}, + {67, "The Witcher"}, + {68, "Succession"}, + {69, "The Tonight Show Starring Jimmy Fallon"}, + {70, "Scrubs"}, + {71, "Mindhunter"}, + {72, "Euphoria"}, + {73, "The Umbrella Academy"}, + {74, "Arrested Development"}, + {75, "Jury Duty"}, + {76, "Seinfeld"}, + {77, "Great News"}, + {78, "Killers of the Flower Moon"}, + {79, "House"}, + {80, "Ted Lasso"}, + {81, "How I Met Your Mother"}, + {82, "Unbreakable Kimmy Schmidt"}, + {83, "All in the Family"}, + {84, "The Leftovers"}, + {85, "Wednesday"}, + {86, "Frasier"}, + {87, "Modern Family"}, + {88, "Better Things"}, + {89, "Brooklyn Nine-Nine"}, + {90, "Everybody Loves Raymond"}, + {91, "Taxi"}, + {92, "Late Night with Seth Meyers"}, + {93, "30 Rock"}, + {94, "Community"}, + {95, "Squid Game"}, + {96, "Will & Grace"}, + {97, "Schitt's Creek"}, + {98, "Get Smart"}, + {99, "The Monkees"}, +}; + +// this function reads the one line, and update row i of the matrix. +void process_one_line(int** matrix, int i, std::string& line){ + std::istringstream iss(line); + // process each (index, value) pair + int index, value; + char openParen, comma, closeParen; + // when used with integers, it reads characters until it encounters a non-digit character or whitespace. However, when used with characters, it reads a single character. + while (iss >> openParen >> index >> comma >> value >> closeParen) { + matrix[i][index] = value; + } +} + +int main(int argc, char* argv[]) { + return 0; +} diff --git a/hws/amazon_prime/movieRatings.txt b/hws/amazon_prime/movieRatings.txt new file mode 100644 index 0000000..96515ef --- /dev/null +++ b/hws/amazon_prime/movieRatings.txt @@ -0,0 +1,500 @@ +(87,3) (11,1) (14,1) (31,4) (101,4) (21,2) (23,1) (3,4) (38,5) (100,2) (109,1) (80,4) (15,3) (71,5) (52,5) (67,2) (78,2) (69,3) (72,2) (93,4) (35,3) (102,4) (81,4) (107,4) (79,4) (58,1) (105,5) (90,2) (6,3) (9,3) (53,4) (59,2) (62,2) (94,2) (54,2) (85,3) (57,5) (5,4) (32,4) (39,2) (42,2) +(6,1) (61,2) (109,2) (87,4) (28,4) (38,5) (22,4) (11,2) (59,4) (68,3) (33,5) (71,3) (72,4) (15,4) (49,3) (94,1) (55,1) +(76,3) (33,1) (78,4) (65,4) (62,4) (73,5) (1,4) (105,2) (34,4) (18,4) (75,4) (99,4) (94,1) (83,3) (14,5) (85,2) (26,4) (15,4) (21,4) (69,1) (10,4) (81,1) (22,3) (61,2) 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+Prime: Movies we think you'll like: +The Shawshank Redemption +The Godfather +Schindler's List +The Lord of the Rings: The Return of the King +The Departed +Prime: TV shows we think you'll like: +Little Women +Breaking Bad +Game of Thrones +The Twilight Zone +The Simpsons diff --git a/hws/amazon_prime/output_15_6.txt b/hws/amazon_prime/output_15_6.txt new file mode 100644 index 0000000..1c54403 --- /dev/null +++ b/hws/amazon_prime/output_15_6.txt @@ -0,0 +1,14 @@ +Prime: Movies we think you'll like: +The Shawshank Redemption +The Godfather +Schindler's List +The Lord of the Rings: The Return of the King +The Departed +Green Book +Prime: TV shows we think you'll like: +Little Women +Breaking Bad +Game of Thrones +The Twilight Zone +The Simpsons +Friends diff --git a/hws/amazon_prime/output_1_0.txt b/hws/amazon_prime/output_1_0.txt new file mode 100644 index 0000000..a1b6920 --- /dev/null +++ b/hws/amazon_prime/output_1_0.txt @@ -0,0 +1,2 @@ +Prime: Movies we think you'll like: +Prime: TV shows we think you'll like: diff --git a/hws/amazon_prime/output_1_1.txt b/hws/amazon_prime/output_1_1.txt new file mode 100644 index 0000000..2306aa4 --- /dev/null +++ b/hws/amazon_prime/output_1_1.txt @@ -0,0 +1,4 @@ +Prime: Movies we think you'll like: +Elvis +Prime: TV shows we think you'll like: +Little Women diff --git a/hws/amazon_prime/output_1_10.txt b/hws/amazon_prime/output_1_10.txt new file mode 100644 index 0000000..a52bb5d --- /dev/null +++ b/hws/amazon_prime/output_1_10.txt @@ -0,0 +1,22 @@ +Prime: Movies we think you'll like: +Elvis +The Shawshank Redemption +The Godfather +Schindler's List +The Lord of the Rings: The Return of the King +Forrest Gump +Gladiator +The Departed +12 Years a Slave +Green Book +Prime: TV shows we think you'll like: +Little Women +The West Wing +Breaking Bad +Game of Thrones +The Twilight Zone +The Simpsons +Friends +The Mary Tyler Moore Show +M*A*S*H +The Wire diff --git a/hws/amazon_prime/output_1_5.txt b/hws/amazon_prime/output_1_5.txt new file mode 100644 index 0000000..96b0742 --- /dev/null +++ b/hws/amazon_prime/output_1_5.txt @@ -0,0 +1,12 @@ +Prime: Movies we think you'll like: +Elvis +The Shawshank Redemption +The Godfather +Schindler's List +The Lord of the Rings: The Return of the King +Prime: TV shows we think you'll like: +Little Women +The West Wing +Breaking Bad +Game of Thrones +The Twilight Zone diff --git a/hws/amazon_prime/output_497_14.txt b/hws/amazon_prime/output_497_14.txt new file mode 100644 index 0000000..539d8e6 --- /dev/null +++ b/hws/amazon_prime/output_497_14.txt @@ -0,0 +1,30 @@ +Prime: Movies we think you'll like: +Elvis +The Shawshank Redemption +Schindler's List +Forrest Gump +Titanic +Gladiator +Green Book +The Silence of the Lambs +The Sound of Music +Amadeus +The English Patient +Moonlight +Birdman +No Country for Old Men +Prime: TV shows we think you'll like: +The Sopranos +The Simpsons +The Mary Tyler Moore Show +Stranger Things +Veep +Homeland +The Handmaid's Tale +The Office (U.S.) +I Love Lucy +The Americans +The People v. O.J. Simpson: American Crime Story +Better Call Saul +Hand of God +Atlanta diff --git a/hws/amazon_prime/output_97_5.txt b/hws/amazon_prime/output_97_5.txt new file mode 100644 index 0000000..ddbfbed --- /dev/null +++ b/hws/amazon_prime/output_97_5.txt @@ -0,0 +1,12 @@ +Prime: Movies we think you'll like: +Elvis +The Shawshank Redemption +The Godfather +Schindler's List +Forrest Gump +Prime: TV shows we think you'll like: +The West Wing +The Sopranos +Breaking Bad +Game of Thrones +The Twilight Zone diff --git a/hws/amazon_prime/output_97_500.txt b/hws/amazon_prime/output_97_500.txt new file mode 100644 index 0000000..deef715 --- /dev/null +++ b/hws/amazon_prime/output_97_500.txt @@ -0,0 +1,158 @@ +Prime: Movies we think you'll like: +Elvis +The Shawshank Redemption +The Godfather +Schindler's List +Forrest Gump +Titanic +The Departed +12 Years a Slave +Green Book +The Sound of Music +Amadeus +The English Patient +Argo +A Beautiful Mind +Spotlight +The King's Speech +Platoon +Dances with Wolves +The Green Mile +The Pianist +The Bridge on the River Kwai +West Side Story +The Godfather: Part II +The Hurt Locker +Slumdog Millionaire +Rain Man +Rocky +Inception +Chariots of Fire +One Flew Over the Cuckoo's Nest +The Apartment +The French Connection +Gone with the Wind +Casablanca +The Phantom of the Opera +My Fair Lady +The Life of Emile Zola +The Deer Hunter +Midnight Cowboy +American Beauty +Gentleman's Agreement +From Here to Eternity +Oliver! +Patton +The Artist +The Family Plan +A Man for All Seasons +The Greatest Show on Earth +An American in Paris +Kramer vs. Kramer +The Descendants +The Batman +Aquaman and the Lost Kingdom +Parasite +Wonka +The Last Emperor +Don't Look Up +Manchester by the Sea +Hacksaw Ridge +The Theory of Everything +Midnight in Paris +Coda +Catch Me If You Can +Nomadland +The Graduate +Pearl Harbor +Dune +King Richard +Drive My Car +The Fabelmans +The Long Goodbye +Nightmare Alley +A Star is Born +Everything Everywhere All at Once +Prime: TV shows we think you'll like: +The West Wing +The Sopranos +Breaking Bad +Game of Thrones +The Twilight Zone +The Simpsons +Friends +M*A*S*H +The Wire +The Marvelous Mrs. Maisel +The Crown +Fleabag +Stranger Things +Veep +The Big Bang Theory +Homeland +The Handmaid's Tale +The Office (U.S.) +Cheers +The Golden Girls +I Love Lucy +Sherlock +Fargo +Mad Men +The Boys +Hand of God +The Good Place +Atlanta +Barry +The Office (UK) +Monty Python's Flying Circus +The Daily Show with Jon Stewart +Late Night with David Letterman +The Tonight Show Starring Johnny Carson +Saturday Night Live +The X-Files +The Big C +Ray Donovan +Keeping Up with the Kardashians +The Twilight Zone (2002) +Dexter +House of Cards +Boardwalk Empire +The Newsroom +Black-ish +The Good Wife +Parks and Recreation +Pose +This Is Us +Watchmen +Vigil +The Ellen DeGeneres Show +True Detective +The Cosby Show +The Witcher +Succession +The Tonight Show Starring Jimmy Fallon +Scrubs +Mindhunter +Euphoria +Arrested Development +Jury Duty +Seinfeld +Great News +Killers of the Flower Moon +House +Ted Lasso +How I Met Your Mother +Wednesday +Frasier +Modern Family +Better Things +Brooklyn Nine-Nine +Everybody Loves Raymond +Taxi +Late Night with Seth Meyers +30 Rock +Community +Squid Game +Will & Grace +Schitt's Creek +The Monkees diff --git a/hws/amazon_prime/recommendation.cpp b/hws/amazon_prime/recommendation.cpp new file mode 100644 index 0000000..185a06b --- /dev/null +++ b/hws/amazon_prime/recommendation.cpp @@ -0,0 +1,162 @@ +#include "recommendation.h" +#include + +// implement collaborative filtering to recommend movies to a user based on the ratings of similar users. The predicted ratings are used to identify movies that the target user might like, and the recommendations are filtered based on a threshold. +// this function returns a list of movie IDs recommended for the user, in recommendedMovies; it assumes the caller would allocate memory for recommendedMovies. +void RecommendationSystem::recommendMovies(int userId, int numRecommendations, int* recommendedMovies) const { + + // to count how many movies are recommended. + int index = 0; + // check if the given userId is valid + if (userId < 0 || userId >= numUsers) { + // handle invalid userId + return; + } + + // calculate similarity scores between the target user (userId) and other users + // compute the similarity between the target user and all other users based on their movie ratings using the cosine similarity measure. The resulting similarity scores are stored in the similarityScores array. This information can then be used to recommend movies to the target user based on the preferences of similar users. + double* similarityScores = new double[numUsers]; + for(int i=0; i 0.0 && magnitudeB > 0.0) ? dotProduct / (sqrt(magnitudeA) * sqrt(magnitudeB)) : 0.0; + // store the similarity score + similarityScores[otherUserId] = similarity; + } + } + + // identify users with high similarity and recommend movies they liked + for (int movieId = 0; movieId < numMovies; ++movieId) { + // user hasn't rated this movie: it's pointless to recommend a movie to the user if the user has already rated this movie. + if (userMovieRatingsMatrix[userId][movieId] == 0) { + + // use these two variables to calculate a weighted sum of ratings from similar users + // and the total similarity across those users. + double weightedSum = 0.0; + double totalSimilarity = 0.0; + + int count = 0; + // calculate a weighted sum of ratings from similar users + for (int otherUserId = 0; otherUserId < numUsers; ++otherUserId) { + // userMovieRatings[otherUserId][movieId] > 0.0 means we only consider users who have rated this movie + // users who have not rated this movie should not be contributing to the totalSimilarity. + if (otherUserId != userId && userMovieRatingsMatrix[otherUserId][movieId] > 0) { + // similar users therefore have a higher weight. + // in other words, the ratings from similar users contribute more to predicting the target user's rating. + weightedSum += similarityScores[otherUserId] * userMovieRatingsMatrix[otherUserId][movieId]; + totalSimilarity += std::abs(similarityScores[otherUserId]); + count++; + } + } + + // avoid division by zero + double predictedRating = (totalSimilarity > 0.0) ? weightedSum / totalSimilarity : 0.0; + + // for simplicity, consider recommending movies with predicted ratings greater than a threshold + if (predictedRating > 3.0) { + recommendedMovies[index] = movieId; + index++; + } + + // stop when the desired number of recommendations is reached + if (index >= numRecommendations) { + break; + } + } + } + + // reclaim memory. + delete [] similarityScores; + return; +} + +// this function returns a list of tv show IDs recommended for the user, in recommendedShows; it assumes the caller would allocate memory for recommendedShows. +void RecommendationSystem::recommendShows(int userId, int numRecommendations, int* recommendedShows) const { + // to count how many movies are recommended. + int index = 0; + // check if the given userId is valid + if (userId < 0 || userId >= numUsers) { + // handle invalid userId + return; + } + + // calculate similarity scores between the target user (userId) and other users + // compute the similarity between the target user and all other users based on their show ratings using the cosine similarity measure. The resulting similarity scores are stored in the similarityScores array. This information can then be used to recommend shows to the target user based on the preferences of similar users. + double* similarityScores = new double[numUsers]; + for(int i=0; i 0.0 && magnitudeB > 0.0) ? dotProduct / (sqrt(magnitudeA) * sqrt(magnitudeB)) : 0.0; + + // store the similarity score + similarityScores[otherUserId] = similarity; + } + } + + // identify users with high similarity and recommend shows they liked + for (int showId = 0; showId < numShows; ++showId) { + if (userShowRatingsMatrix[userId][showId] == 0) { // User hasn't rated this show + double weightedSum = 0.0; + double totalSimilarity = 0.0; + + // calculate a weighted sum of ratings from similar users + for (int otherUserId = 0; otherUserId < numUsers; ++otherUserId) { + if (otherUserId != userId && userShowRatingsMatrix[otherUserId][showId] > 0) { + weightedSum += similarityScores[otherUserId] * userShowRatingsMatrix[otherUserId][showId]; + totalSimilarity += std::abs(similarityScores[otherUserId]); + } + } + + // avoid division by zero + double predictedRating = (totalSimilarity > 0.0) ? weightedSum / totalSimilarity : 0.0; + + // for simplicity, consider recommending shows with predicted ratings greater than a threshold + if (predictedRating > 3.0) { + recommendedShows[index] = showId; + index++; + } + + // stop when the desired number of recommendations is reached + if (index >= numRecommendations) { + break; + } + } + } + + // reclaim memory. + delete [] similarityScores; + return; +} diff --git a/hws/amazon_prime/showRatings.txt b/hws/amazon_prime/showRatings.txt new file mode 100644 index 0000000..ec73589 --- /dev/null +++ b/hws/amazon_prime/showRatings.txt @@ -0,0 +1,500 @@ +(21,2) (9,3) (99,2) (73,3) (57,4) (40,4) (50,5) (68,5) (23,1) (17,3) (82,2) (29,3) (84,4) (69,4) (87,4) (96,1) (1,5) (38,1) (80,2) (78,4) (79,5) (74,4) (10,2) (62,4) (42,4) (33,4) (6,4) (67,4) (39,2) (30,1) (19,2) (14,3) (37,1) (89,5) (63,3) (36,1) +(54,5) (50,1) (21,3) (93,2) (2,4) (43,2) (97,5) (89,5) 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