Đang tải... (xem toàn văn)
tài liệu môn dự án(project) của nhóm chúng tôi Phú Diễn: Dự án khu chung cư và nhà ở liền kề tại Hà Nội · Jade Square: Dự án tổ hợp căn hộ, văn phòng và công cộng tại · Handico Complex: Dự án khu hỗn hợp văn .
VIETNAM NATIONAL UNIVERSITY, HANOI INTERNATIONAL SCHOOL - Subject: PROJECT Report Final Examination Class : INS3008 Lecturer : Hung Ha Manh Topic : Customer Analysis Group number : Member : Nguyen Anh Tu - 20070998 Ha Thi Linh - 20070946 Ho Thi Kim Oanh - 20070970 Le Minh Trang - 20070991 Le Thi Huyen Trang - 20070992 Hanoi, 17th October 2023 TABLE OF CONTENTS CHAPTER 1: INTRODUCTION CHAPTER 2: DATA OVERVIEW Dataset Dataset Dataset CHAPTER 3: EXPLORATORY DATA ANALYSIS Pre-processing Data Visualization .9 Observations After Visualizing Data 12 Exploratory Phase General Conclusions 12 CHAPTER 4: MACHINE LEARNING ALGORITHMS 13 Preprocessing 13 Linear Regression Model 14 Bayesian Ridge 15 Lasso Model .16 Polynomial Regression Model 17 CHAPTER 5: SUMMARY 18 CHAPTER 6: CONCLUSION 19 CHAPTER 1: INTRODUCTION Boston's culinary scene is both diverse and vibrant, offering countless culinary experiences for residents and visitors alike However, navigating the endless restaurant options can be a daunting task, often leaving diners unsure of where to find their next special meal It's not just a matter of finding any restaurant; it's about discovering hidden gems that always deliver a 5-star dining experience Against this backdrop, we begin our journey to demystify Boston's restaurant world through data-driven insights and predictive analytics Our "Boston 5-Star Restaurant Prediction" project strives to provide a solution that empowers diners and restaurant owners with the ability to accurately predict restaurant ratings The following project was created by Enrique Alvarez, Diego Cabrera, Shakti Das, Cara Donovan and Enrique Esparragoza under the guidance and supervision of Professor Mohammad Soltanieh-ha Leveraging machine learning algorithms, our goal is to create a model that can determine a restaurant's rating based on a variety of influencing factors, including location, price, type of cuisine and other appropriate variables extracted from the Yelp review dataset To start, we preprocessed the data and performed thorough EDA to better understand the factors important for model training We then use four models to predict restaurant ratings: linear regression, bayesian ridge, lasso model, polynomial regression For each of these models, we evaluate performance metrics: RMSE, MAPE, MAE and R-squared Ultimately, we aim to provide a valuable tool for both diners and restaurant owners by providing more accurate and data-driven insights into what makes a restaurant worthy of recognition 5-star rating in Boston's dynamic culinary scene CHAPTER 2: DATA OVERVIEW The data file is available on Harvard Dataverse and contains information about 2,664 Boston restaurants that were reviewed on Yelp from October 2004 to August 2020 We selected datasets (restaurants, reviews, and neighborhood), with the right drivers helping the restaurant receive stars in the Boston area The data was processed by the Boston Area Research Initiative (BARI) and divided into the three data sources mentioned above During this initial discovery phase, we dug deep into the data to understand the meaning of each variable and the relationships between our three data sources Dataset Here come the datasets, in which Dataset - Restaurants (Yelp.Restaurants.csv) contains many variables, each providing valuable insights into the restaurant landscape of Boston explained below: restaurant_name shows restaurant name as posted on Yelp restaurant_ID unique number for each restaurant restaurant_address postal address as posted on Yelp restaurant_tag shows tags used to describe a restaurant (cafe, restaurant, american, chinese, italian, etc) rating average rating based on reviews, this rating goes from to in 0.5 increments price estimates cost of food with Yelp's classification system from review_number total reviews the restaurant has received unique_reviewer number of unique reviewers who reviewed the restaurant reviews_MMM_YY number of reviews in a given month restaurant_neighborhood shows which neighborhood the restaurant is in according to Yelp GIS_ID identifier for the land parcel the restaurant is in CT_ID_10 2010 Census Tract ID number Dataset Dataset - Reviews (Yelp.Reviews.csv) has a large number of variables, each of which offers insightful information on the Boston restaurant's review, as follows: restaurant_name shows restaurant name as posted on Yelp restaurant_ID unique number for each restaurant review_date The date review was made for the restaurant reviewer_name The name of the person who wrote the review reviewer_origin The origin or location of the reviewer reviewer_profile Information about the reviewer's background or preferences history_1 one of the fields to store additional historical information about the restaurant history_2 Another field for historical information history_3 A third field for historical data Dataset Dataset - Neighborhoods (Yelp.CT.csv) has variables that provide information about various aspects of restaurants within the identified neighborhood CT_ID_10 represents a code or identifier for a neighborhood as posted on Yelp NUM_REST The number of restaurants within the identified neighborhood RATE_REVIEWS The rate of reviews received by restaurants in the neighborhood is according to Yelp RATE_REVIEWERS The rate of reviewers providing feedback or reviews within the neighborhood AVG_RATING The average rating of all the restaurants in the designated neighborhood PCT_DLRS_1 The percentage of restaurants in the neighborhood falling into the lowest price range PCT_DLRS_2 The percentage of restaurants in the neighborhood falling into the secondlowest price range PCT_DLRS_3 The percentage of restaurants in the neighborhood categorized as mid-range or moderately expensive PCT_DLRS_4 The percentage of restaurants in the neighborhood considered high-end or expensive PCT_DLRS_NA The percentage of restaurants for which the price range is not available or not specified CHAPTER 3: EXPLORATORY DATA ANALYSIS Once we have imported the data, we will conduct an exploration phase to learn more about the data, uncover insights from the start and identify areas or patterns to dig into Describe the data: we use the info() function to get a concise summary of each Data Frame Pre-processing 1.1 Check the data overview The purpose of calling restaurants.info() is to get a quick overview of the structure and content of the "restaurants" data frame This information can be valuable when working with data, as it helps you understand the data's characteristics, such as missing values and data types, which can inform subsequent data cleaning, analysis, and visualization tasks This line of code is used to check the overview of the data in the 'reviews' DataFrame The results show that 467,105 restaurants This line of code is used to check the overview of the data in the 'neighboroods' DataFrame The results showed 181 neighborhoods 1.2 Replace string values with numeric values Replace the string values in the "price" column of a data frame named "restaurants" with numerical values based on a mapping defined in the price_dict dictionary After executing this code, the "price" column in the "restaurants" data frame will contain numerical values instead of the original string values 1.3 Summary of statistics for the ratings This code is used to calculate and display descriptive statistics for the "ratings" column in a data frame named "restaurants" By using `.describe()` on the "rating" column, can quickly see a summary of statistics for the ratings of the restaurants in the "restaurants" data frame The results show that the average rating across all restaurant data is approximately 3.5 1.4 Determining the number of unique reviewers When you execute this code, it will return the number of unique reviewers based on the values in the "reviewer_name" column In this case, there are 64,688 unique reviewers in the data 1.5 Count the number of missing values The code `rest_reviews.isnull().sum()` is used to count the number of missing values (null or NaN values) in each column of the "rest_reviews" data frame Have 356 restaurants in the "rest_reviews" data frame don't have associated reviewers This observation is based on the count of missing values in a specific column that represents the presence or absence of reviewers for restaurants If there are 356 missing values in this column, it suggests that there are 356 restaurants without associated reviewers in the merged data frame Initial Observations: It looks like the price variable in the restaurants data frame is a string due to Yelp's classification system We converted it to integer In the reviews data frame, not every reviewer reviewed every restaurant 467,105 restaurants but only 466,749 reviewers In the neighborhoods dataframe, not all neighborhoods have restaurants with reviews Looks like 169 of 181 neighborhoods have restaurants with reviews Data Visualization 2.1 Correlation matrix The graph visualizes will show the correlation coefficients between pairs of numeric variables in the "adj_rest_reviews" data frame The intensity of colors and the numerical values in each cell indicate the strength and direction of the correlation Positive values suggest a positive correlation, while negative values suggest a negative correlation There is no feature that is correlated with the target feature The variables don’t have a negative correlation Variables like history_2 & history1; history_3 & history_2; history_4 & history_2,3; history_5 & history_2,3,4; reviewer_reviews & history_1,2,3,4,5 are having a strong positive correlation A correlation coefficient value greater than 0.7 indicates multicollinearity 2.2 Visualize data with charts The resulting scatter plot will show individual data points for each restaurant, with the x-axis representing the rating and the y-axis representing the number of unique reviewers It will help you visually assess whether there is any correlation or pattern between the restaurant's rating and the number of reviewers 10 This is a violin plot that visualizes the distribution of restaurant ratings vs the number of unique reviewers ("unique_reviewer") for the restaurants in the "new_restaurants" data frame The resulting violin plot will provide a visual summary of how restaurant ratings are distributed based on the number of unique reviewers It allows you to see not only the central tendency but also the shape of the distribution, the presence of multiple modes, and the density of data points at different levels of ratings The resulting bar graph will show different cuisine types on the x-axis and the corresponding restaurant ratings on the y-axis Each bar represents a specific cuisine, and the height of the bar represents the average or aggregated rating for that cuisine The resulting bar graph will show different cuisine types on the x-axis and the number of unique reviewers on the y-axis Each bar represents a specific cuisine, and the height of the bar represents the average or aggregated number of unique reviewers for that cuisine This type of visualization allows you to compare how different cuisines are associated with the number of reviewers and identify which cuisines tend to attract more or fewer unique reviewers in dataset 11 The resulting bar graph will show different cuisine types on the x-axis and the count of restaurants for each cuisine on the y-axis Each bar represents a specific cuisine, and the height of the bar represents the count of restaurants belonging to that cuisine This type of visualization is useful for understanding the distribution of restaurants across different cuisines and identifying which cuisines have a higher or lower number of restaurants in dataset Observations After Visualizing Data By looking at the plot of rating vs number of reviewers, we learn that the majority of reviews are happening between the 3.5 and 4.5-star range Highest fated cuisine is bakeries, lowest rated is fast food Four types of cuisine stand out as the ones receiving the highest number of reviews: American, Italian, seafood, and Japanese Four types of cuisine stand out as the ones receiving the highest number of reviews: American, Italian, seafood, and Japanese Pizza is the most used tag by restaurants, this means that there is a high number of restaurants selling pizza in comparison to other cuisines Exploratory Phase General Conclusions We are facing data regarding 2,664 restaurants in the city of Boston and each restaurant has its unique characteristics and variables that might affect rating Prioritizing the most important variables affecting rating will be crucial for the success of our model The data is clean, thanks to the processing already made by BARI, but we will still need to manipulate and convert some of our variables into dummies for them to work with a regression model The data relies on the assumption that the user understands what a census tract is In order to present final results and recommendations we will need to translate census tracts into something more commonly used like addresses, counties or zip codes 12 CHAPTER 4: MACHINE LEARNING ALGORITHMS Methodology: We used four models to predict restaurant ratings: Linear regression Bayesian ridge Lasso model Polynomial regression For each of these models, we evaluated performance metrics: RMSE, MAPE, MAE and Rsquared Preprocessing This is essential information about DataFrame 'new_restaurants', which serves as the foundation dataset for our upcoming model This DataFrame has been meticulously prepared, missing values handled, unnecessary columns removed, and categorical features converted into a suitable format for our regression analysis It contains important data that will drive a predictive model designed to forecast restaurant ratings with rows × 23 columns 13 Prior to building the model we will preprocess the data, drop useless variables, and replace missing values We will drop the following fields as we won't need them for the regression model: 'restaurant_name', 'restaurant_address', 'restaurant_tag', 'restaurant_neighborhood' 229 missing values for 'rating'; we will replace them with 3.5 which is the mean rating 665 missing values for 'price'; we will replace them with 1.67 which is the mean price There are two missing values for cuisine categories 3-6 We won't use these fields and will drop them missing values for cuisine categories and We will impute with the most common cuisine type We will convert cuisine categories and to dummy variables Linear Regression Model 14 Scikit-learn library in Python to create a linear regression model, providing many machine learning tools and algorithms for data analysis and model building The code is used to compare between the actual value (ytest) and the predicted value (y_model) on the test data, and then only displays a small portion of the results (first 50 lines) for testing check Bayesian Ridge 15 Lasso Model 16 Polynomial Regression Model After analyzing models, we have the following table of results: Metric Linear regression Bayesian Lasso Polynomial regression MSE 0.51 0.46 0.54 MAPE 19.4% 18.8% 20.3% 22.19% MAE 0.53 0.5 0.53 0.62 0.17 0.03 -0.54 R-squared 0.096 17 0.85 CHAPTER 5: SUMMARY In this project, our objective was to anticipate the ratings of Boston restaurants In order to effectively complete this project, we went through each stage of a business analytics problem We started out by defining our challenge and choosing the data source during a brainstorming phase All of the data was then cleaned and put through the preliminary exploration stage outlined in this notebook We proceeded to preprocess the data once more after compiling our initial observations, eliminating pointless measurements and replacing missing values in order to run the predictive models The Bayesian ridge was ultimately chosen as the best model after others were examined (MAE=0.5) For all of us, it was incredibly gratifying to use this organized method that businesses use to generate data-driven predictions and improve decisions 18 CHAPTER 6: CONCLUSION Following the testing of our four models, we came to the conclusion that the Bayesian Ridge model, which had a lower Mean Absolute Error (MAE), was the most accurate at predicting rating Additionally, the Bayesian Ridge model has the lowest Mean Standard Error (MSE) of all the models We had to explain what an MAE of 0.5 meant because it is relative to the data set This means that for our model, we could forecast a rating and it might be wrong by 0.5 Additionally, we have to consider that ratings range from to Even though we had a winner, we were conscious that these data needed to be interpreted cautiously All of the models' R-squared values were low, so we had to be cautious and skeptical about their accuracy We were aware that some academic disciplines naturally exhibit higher levels of unexplained variance, and that the R2 values in these domains are therefore likely to be lower Studies that attempt to explain human behavior, for instance, typically have R2 values below 50% It's just that people are more unpredictable than, say, physical systems Since rating the quality of a restaurant is a very subjective topic in this analysis, MAE rather than R2 was our criterion for choosing the best model 19