This is a code repository for the corresponding video tutorial. Using React, Node.js, Express & MongoDB you'll learn how to build a Full Stack MERN Application - from start to finish. The App is called "Memories" and it is a simple social media app that allows users to post interesting events that happened in their lives.

A MERN stack based social media application [Full-Stack React Projects]

Social media bot that posts personalized license plate applications the California DMV received

Showcasing Google Cloud's generative AI for marketing scenarios via application frontend, backend, and detailed, step-by-step guidance for setting up and utilizing generative AI tools, including examples of their use in crafting marketing materials like blog posts and social media content, nl2sql analysis, and campaign personalization.

A very basic single feed social media application. Built on top of React-Native and Firebase real-time database with persistent data storage for user's device.

Munia - an open source social media web application built wth Next.js App Router.

A basic social media application to demonstrate Elixir + Phoenix + GraphQL + React + Apollo

[Full stack react project/ MERN stack project] A MERN stack based project on social media application with admin panel. It is completely working project. it's completely responsive application

Code to Image converter is a beautifully designed application that helps you generate beautiful and customizable images of your code snippets. This is built for the developer by the developer. If you want to share your code with anyone or on any social media this is the application you need.

ReelsMaker is a Python-based/streamlit application designed to create captivating faceless videos for social media platforms like TikTok and YouTube.

FetchIt is an Android application that makes downloading videos from a wide variety of platforms easy and efficient. Whether saving videos from popular social media, streaming sites, or video platforms.

DevBrute is a versatile password brute forcing tool designed to tackle a wide range of Social Media accounts and Web Applications. With its robust capabilities, it's adept at breaking through various security barriers.

Social media application built with the MERN stack

A Social Media Web-Application with Chat and Video Call functionality, made with Django.

One stop application for farmers. 📱👨‍🌾 It provides E-commerce, social media, reading articles, APMC statistics, weather forecasting, etc. This application uses the best technologies and practices and serves the need very well. 🚜

Backend/API for the Mumble.dev, an open source social media application.

SMMBOOSTER is an online social media marketing tool (web application) that allows to buy SMM services from your service providers and start selling them in your own panel. With an easy to use panel. You can provide quality and cheap SMM Services to your customers, they can buy all packages or services like post likes, followers, views, or even general engagement or website traffics and many more using your panel. You can create as many as services & packages according to your expertise, is a completely dynamic panel. Whether it is something you need for your social media accounts or you are a SMM services reseller. by using this script you can start building your online business today

This handy application is designed to make downloading videos and images from various social media platforms a breeze. Whether you're looking to save a memorable Instagram video, a high-resolution YouTube clip, a Pinterest image, or media from Twitter, this toolkit has got you covered.

An application that discovers content on social media for hashtags

End to end human text analysis package, specifically suited for social media and social scientific applications. It is written in Python 3 and developed by the World Well-Being Project at the University of Pennsylvania and Stony Brook University.

Rippl is a social media application developed using Flutter and managed with the GetX state management tool. It vows to revolutionize your social engagements by offering a smooth and immersive experience.

Bootstrap one page application for sharing your all social media links at one page | Replace few details of you in the code. That's it!

Full stack, fully-featured social media web application using React, Firebase, Redux, Express, and Material-UI. Implemented backend REST API server with Node.js and Express, user login and authentication, image uploads, notifications, cloud functions, deploying to Firebase

FIT is a modular suite of Python applications for digital forensic acquisition of online contents such as web pages, emails, social media, and more. Each module can run independently or as part of the full FIT suite.

Aggie is a web application for using social media and other resources to track incidents around real-time events such as elections or natural disasters.

This is the latest school management system. Available for all type of schools. will work on Phone, Laptop, Tabs, monitors - any screen size. It is available with 100% source code. The features are listed below: INSTALLATION Upload the downloaded zip file to your server in the public_html directory. Extract the zip file. Create a new database from your server mysql. Create user to the database and link the database to the user. Open the file database.php from the directory yourfolder/application/config/database.php. Fill up this information with your database hostname, database username, database password, database name respectively which you have created in the previous step. Now from server phpmyadmin go to your database. Select import and choose the file install.sql located in yourfolder/database/blank_db.sql (demo_db.sql for demo database) And you are ready to go now to browse the application Default admin credentials Email: admin@admin.com Password: admin ADMIN PANEL Managing User accounts (teacher, student, parent) Managing classes, subjects Managing exam, grades Managing exam marks Managing Loan Information Managing Computer Based Test (CBT) Sending exam marks via sms Managing students attendance Managing accounting, income and expenses Managing school events Managing Teachers Managing Libratrian Managing Accountant Manage Circular Manage Task Managing Parents Managing Alumni Managing Academic Sysllabus Managing Helpful Links Managing Help Desk Managing Front-End Information Managing School Session Attendance Reports Managing Staff ID Cards Records management. Notification board management. Management relationships between different type of users. Online Payment acceptance of FEE. Section Management. Reports generator. SMS Alerts. Managing Hostel Manager Managing library, dormitory, transport Messaging between other users Managing system settings (general, sms, language) Managing Media Subject management. Class management. Student payments management. Student behaviour management. Payments Overview. Subjects and assignments management. Fees management. Student assignment results management. Student search. Overdue students list. Student management. Student-Teacher interaction. And many more … TEACHERS Manage Students homework. Assign homework. Share homework on social networking sites (facebook). Manage classes. Manage Student Report. Generate Remarks on Student Reports. Generate Student Attendence. Subject management. Loan Application Class management. Student behaviour management. Subjects and assignments management. Student assignment results management. Student search. Student management. Student-Teacher interaction. Managing Helpful Links Managing Media Assignments Attendance Provide Daily Quotes Holidays Studennts Study Materials Message Noticeboard Transportations And many more… STUDENT PANEL Get class Routine Attempt Online Exam View Online Exam Result Get Exam Marks Message View Noticeboard Transportatio Receive SMS Get attendance status Get study materials / files from teacher Get payment invoice, Pay Online Communicate with teacher Managing Media accounts View Event Schedule, Notice and Holidays Get Helpful Links View Daily Quotes Contact Help Desks And many more …. PARENT PANEL View Children Marks View Children Class Routine Make payment View Payment Invoice Message Admin Message Teachers View Received Messkages Checkin kids progress. Parent-Teacher interaction. Get alerts from School Administration or Teachers. View events Noticeborad Todays Thought News Helpful Links Help Desk Receive SMS And many more … LIBRARIAN Add books Update books Record Lost Books Generate Reports on Books Subject Management. Loan Application Student Search. Student Management. Student-Librarian Interaction. View Helpful Links View Media Holidays Studennts Study Materials Message Transportations Noticeboard View Notification And many more …. ACCOUNTANTS Create Student Payments Students Payment Expenses Expenses Category Vew all Accountants Loan Application Todays Thought News Holidays Message k Noticeboard And many more …. HOSTEL MANAGER ViewAll Hostel Managers Manage Hostels Loan Application Todays Thought News Holidays Message Noticeboard And many more …. ………………………………………………………………………………………………… ADMIN PANEL DASHBORD ………………………………………………………………………………………………… Total number of students, teachers, librarian, accountants, hostel manager, alumni, parents and attendance of students for that day at a glance, Dashboard also holds a calendar for showing events, charts for various percentages of teachers, parents, students attendance, grades, students performances, etc. MANAGING SESSION From navigation go to manage session Add / edit / delete MANAGING ACADEMIC SYLLABUS From navigation go to manage academic syllabus Add / edit / delete MANAGING MEDIA From navigation go to manage media Add / edit / delete MANAGING STUDENTS Admit Students From navigation, go to students > admit students Fill up the necessary information Save student Admit Bulk Students From navigation, go to student > admit bulk student Download the blank Excel file Fill up the information Select class Upload the filled up Excel file Save Student Information From navigation go to student > student information Here you can see the students class wise If a class has sections then you can also browse the students as per class sections Student mark sheets From navigation go to student > student mark sheet Here you can see all the students marks class wise If the class has sections then you can also see them along with class MANAGING TEACHERS From navigation go to teacher Here you can see the list of teachers of your school in a tabular form To add a new teacher, click the top right button named add new teacher and fill up the information and save For editing or deleting a teacher information click the action button assigned to each entry of the table. That will bring two options for editing and deleting. Click on the required action editing and deleting MANAGING ACCOUNTANTS From navigation go to accountant Here you can see the list of accountants of your school in a tabular form To add a new accountant, click the top right button named add new accountant and fill up the information and save For editing or deleting a teacher information click the action button assigned to each entry of the table. That will bring two options for editing and deleting. Click on the required action editing and deleting MANAGING LIBRARIANS From navigation go to librarian Here you can see the list of librarians of your school in a tabular form To add a new librarian, click the top right button named add new librarian and fill up the information and save For editing or deleting a teacher information click the action button assigned to each entry of the table. That will bring two options for editing and deleting. Click on the required action editing and deleting MANAGING HOSTEL MANAGERS From navigation go to hostel manager Here you can see the list of hostel managers of your school in a tabular form To add a new hostel manager, click the top right button named add new hostel manager and fill up the information and save For editing or deleting a teacher information click the action button assigned to each entry of the table. That will bring two options for editing and deleting. Click on the required action editing and deleting MANAGING ALUMNI From navigation go to alumni Here you can see the list of alumni of your school in a tabular form To add a new alumni, click the top right button named add new alumni and fill up the information and save For editing or deleting a teacher information click the action button assigned to each entry of the table. That will bring two options for editing and deleting. Click on the required action editing and deleting MANAGING PARENTS From navigation go to parents Here you can see the list of parents of the students of your school in a tabular form To add a new parent, click the top right button named add new parent and fill up the information and save For editing or deleting a parent information click the action button assigned to each entry of the table. That will bring two options for editing and deleting. Click on the required action for editing and deleting MANAGING CLASSES From navigation go to > manage sections Add new class section for a class and assign teacher for each of them View the class sections in a tabular form class wise Edit and delete class section information MANAGING CLASS SECTION From navigation go to class > manage sections Add new class section for a class and assign a teacher for each of them View the class sections in a tabular for class wise Edit and deklete class section information MANAGING SUBJECTS From navigation go to subject If you have already added classes then under this you will see a list of the classes added. If you have not created classes, please create class first Here you can see the subjects class wise Add or edit or delete subjects MANAGING CLASS ROUTINE From navigation go to class routine View all the class routines in accordion Add class routine Click on the subject name on routine to edit and delete MANAGING DIALY STUDENT’S ATTENDENCE From navigation go to daily attendance Select the date and class and click manage attendance That will bring up the students name and attendance information in a tabular form To update the attendance status or for taking the attendance for that particular date of that particular class which you have selected earlier, click the button named update attendance Put the status for all at once and click save changes MANAGING EXAMS Exam list From navigation, go to exam > exam list Add an exam for all Edit and delete exam Exam grade From navigation go to exam > exam grades Add exam grades as per the requirements of your institution Edit or delete exam grades Manage exam marks From navigation go to > manage marks Select exam, class and subject and click manage marks for changing or updating marks That will bring up the form for updating the students marks for that particular subject Enter the marks and click update Sending exam marks by SMS From navigation go to exam > send mark by SMS Select exakm and class and receive (students/parent) Click the button named send mark via SMS That will send SMS with the marks for that exam you have selected if a SMS service is already activated MANAGING PAYMENTS From navigation go to payment Add invoice and take manual payment multiple time under the same invoice If a payment is due, then an option will be there for taking the payment in the action button of the table that contains the list of all the invoices with the basic information. Edit or delete invoice LOAN MANAGEMENT From navigation go to loan application See all the applied loans Click on apply loan Fill forms to apply Wait for loan approval COMPUTER BASED TEST (CBT) From navigation, go to Manage CBT Click on Add Exam Set Class, Exam Time, Exam Duration, Subject, Question Count and Session Click on continue to Add Questions Click on List Exams to View Exams Click on View Result to View Exams Scores ACCOUNTING Incomes From navigation, go to accounting > incomes Here you can see all the incomes for your school that means students fee in a tabular form with their payment time and amount EXPENSES From navigation, go to accounting > expenses Add expenses for the school Edit or delete them GENERATING STAFF IDCARD Teacher, librarian, accounant, hostel manager From navigation, go to staff > ID CARD Here you can you will see a button asking you to click generate ID CARD EXPENSE CATEGORY From navigation, go to accounting > expense category Add expense category Edit or delete them MANAGING BOOKS From navigation go to library Add books Edit or delete them MANAGING TRANSPORT From navigation go to transport Add transport information Edit or delete them MANAGING DORMITORY From navigation go to dormitory Add / edit / delete MANAGING ASSIGNMENT From navigation go to assignment Add / edit / delete MANAGING HOLIDAYS From navigation go to holiday Add / edit / delete MANAGING TODAY’S THOUGHT From navigation go to today’s thought Add / edit / delete MANAGING CIRCULAR From navigation go to circular Add / edit / delete MANAGING SCHOOL CLUBS From navigation go to school club Add / edit / delete MANAGING TASK From navigation go to task manager Add / edit / delete MANAGING HELPFUL LINK From navigation go to Helpful Links Add / edit / delete MANAGING ENQUIRY From navigation go to enquiry Add / edit / delete MANAGING ENQUIRY CATEFORY From navigation go to enquiry category Add / edit / delete MANAGING HELP DESK From navigation go to task Helpdesk Add / edit / delete NOTICEBOARD From navigation go to notice board Add / edit / delete them For sending the notice to all as SMS, yes while creating the notice This will send SMS to all the users about that notice PRIVATE MESSAGING From navigation, go to message Admin can send message to all users For sending message, select user and type the message and click send You can also see all the message sent to you or sent from you SYSTEM SETTINGS From navigation go to settings > general settings You can change basic system settings here and also can select language You can also upload logo from here THEME SETTINGS From navigation go to setting > general settings On the right of the page there is a panel named theme settings You find several skin options for you application Select you desire one to make changes SMS SETTINGS From navigation go to settings > sms settings Here you will find 2 SMS services, one is Clickatell and another is Twilio You have to activate a service first Then put the necessary information for a service Visit https://www.twilio.com/user/acount/settings/international /sms LANGUAGE SETTINGS From navigation go to setting > language settings Change phrase or add new phrase for a particular language Add new language MANAGE BANNER SETTINGS From navigation go to setting > banner settings Add / edit / delete MANAGE FRONT END SETTINGS From navigation go to setting > front end settings Add / edit / delete MANAGE NEWS SETTINGS From navigation go to setting > news settings Add / edit / delete ACCOUNT SETTINGS From navigation go to account Change basic account information Update your password Change profile image ……………………………………………………………………………………………….. TEACHER PANEL DASHBOARD ………………………………………………………………………………………………. Total number of students, parents and attendance of students for that day at a glance Dashboard also holds a calendar for showing events. MANAGING STUDENTS Admit students From navigation go to student > admit student Fill up the necessary information Save student Student information From navigation go to student > student information Here you can see the student class wise If a class has sections then you can also browse the students as per class sections Student mark sheets From navigation go to student > student mark sheet Here you can see all the students marks class wise If the class has sections then you can also see them along with class MANAGING DAILY STUDENT’S ATTENDANCE From navigation go to daily attendance Select the date and class and click mange attendance That will bring up the students name and attendance information in a tabular form To update the attendance status or for taking the attendance for that particular date of that particular class which you have selected earlier, click the button named update attendance Put the status for all at once and click save changes MANAGING DAILY STUDENT’S ATTENDANCE From navigation go to daily attendance Select the date and class and click manage attendance That will bring up the students name and attendance information in a tabular form To update the attendance status or for taking the attendance for that particular date of that particular class which you have selected earlier, click the button named update attendance Put the status for all at once and click save changes MANAGING ASSIGNMENT From navigation go to assignment That will bring up the assignemnt page in a tabular form, you can click on add assignment on left corner of the page to add assignment. MANAGING CLASSES From navigation go to > manage sections Add new class section for a class and assign teacher for each of them View the class sections in a tabular form class wise Edit and delete class section information MANAGING CLASS SECTION From navigation go to class > manage sections Add new class section for a class and assign a teacher for each of them View the class sections in a tabular for class wise Edit and deklete class section information MANAGING SUBJECTS From navigation go to subject If you have already added classes then under this you will see a list of the classes added. If you have not created classes, please create class first Here you can see the subjects class wise Add or edit or delete subjects MANAGING CLASS ROUTINE From navigation go to class routine View all the class routines in accordion Add class routine Click on the subject name on routine to edit and delete MANAGING DIALY STUDENT’S ATTENDENCE From navigation go to daily attendance Select the date and class and click manage attendance That will bring up the students name and attendance information in a tabular form To update the attendance status or for taking the attendance for that particular date of that particular class which you have selected earlier, click the button named update attendance Put the status for all at once and click save changes MANAGING EXAMS Manage exam marks From navigation go to > manage marks Select exam, class and subject and click manage marks for changing or updating marks That will bring up the form for updating the students marks for that particular subject Enter the marks and click update MANAGING HELPFUL LINK From navigation go to Helpful Links Add / edit / delete NEWS From navigation go to view news View all the uploaded news TODAY’S THOUGHT From navigation go to today’s thought View all the uploaded today’s thought HOLIDAY DATES From navigation go to holiday View all the holiday with their respectives dates ……………………………………………………………………………………………………. STUDENT PANEL DASHBOARD ……………………………………………………………………………………………………. Total number of students, teachers, parents and attendance of students for that day at a glance, dashboard also holds a calendar for showing event CLASS ROUTINE Form navigation go to class routine View the class routine of the logged in student EXAM MARKS From navigation go to exam > manage marks Select exam and subject See the mark for the selected exam in the selected subject COMPUTER BASED TEST (CBT) From navigation go to online CBT See all the uploaded test for your class Attemtp the uploaded test View your results STUDY MATERIALS From navigation go to study materials See all the uploaded study materials for your class Download the materials ASSIGNMENT From navigation go to assignment See all the uploaded assignments for your class Download the assignment MEDIA From navigation go to media See all the uploaded media for your class Download or watch media NEWS From navigation go to view news View all the uploaded news TODAY’S THOUGHT From navigation go to today’s thought View all the uploaded today’s thought HOLIDAY DATES From navigation go to holiday View all the holiday with their respectives dates HELPFUL LINKS From navigation go to helpful links View all the helpful links HELP DESK From navigation go to help desk Submit or create help desk to the administrator STUDY MATERIALS From navigation go to study material See all the uploaded study material for your class Download the study material PAYMENT / PAY WITH PAYPAL From navigation go to payment See the list of invoices Pay online with paypal for the unpaid invoices COMMUNICATE WITH TEACHERS / ADMIN From navigation go to message Send new message to teachers and admin Get the sent message to you ………………………………………………………………………………………………...... ACCOUNTANT PANEL DASHBOARD ………………………………………………………………………………………………….. Total number of students, accountants, parents and attendance of student for that day at a glance. Dashboard also holds a calendar for showing events. MANAGING PAYMENTS From navigation go to payment Add invoice and take manual payment multiple time under the same invoice If a payment is due, then an option will be there for taking the payment in the action button of the table that contains the list of all the invoices with the basic information. Edit or delete invoice LOAN MANAGEMENT From navigation go to loan application See all the applied loans Click on apply loan Fill forms to apply Wait for loan approval MESSAGING From navigating go to message Send message to teachers and admin Get the message sent to you NEWS From navigation go to view news View all the uploaded news TODAY’S THOUGHT From navigation go to today’s thought View all the uploaded today’s thought HOLIDAY DATES From navigation go to holiday View all the holiday with their respectives dates HELPFUL LINKS From navigation go to helpful links View all the helpful links HELP DESK From navigation go to help desk Submit or create help desk to the administrator TRANSPORTATION From navigation go to transportation View transportation available ………………………………………………………………………………………………...... LIBRARIAN PANEL DASHBOARD ………………………………………………………………………………………………….. Total number of students, librarian, parents and attendance of student for that day at a glance. Dashboard also holds a calendar for showing events. MANAGING BOOKS From navigation go to library Add books Edit or delete them LOAN MANAGEMENT From navigation go to loan application See all the applied loans Click on apply loan Fill forms to apply Wait for loan approval MESSAGING From navigating go to message Send message to teachers and admin Get the message sent to you NEWS From navigation go to view news View all the uploaded news TODAY’S THOUGHT From navigation go to today’s thought View all the uploaded today’s thought HOLIDAY DATES From navigation go to holiday View all the holiday with their respectives dates HELPFUL LINKS From navigation go to helpful links View all the helpful links HELP DESK From navigation go to help desk Submit or create help desk to the administrator TRANSPORTATION From navigation go to transportation View transportation available ………………………………………………………………………………………………...... HOSTEL MANAGER PANEL DASHBOARD ………………………………………………………………………………………………….. Total number of students, hostel managers, parents and attendance of student for that day at a glance. Dashboard also holds a calendar for showing events. MANAGING DORMITORY From navigation go to dormitory Add / edit / delete LOAN MANAGEMENT From navigation go to loan application See all the applied loans Click on apply loan Fill forms to apply Wait for loan approval MESSAGING From navigating go to message Send message to teachers and admin Get the message sent to you NEWS From navigation go to view news View all the uploaded news TODAY’S THOUGHT From navigation go to today’s thought View all the uploaded today’s thought HOLIDAY DATES From navigation go to holiday View all the holiday with their respectives dates HELPFUL LINKS From navigation go to helpful links View all the helpful links HELP DESK From navigation go to help desk Submit or create help desk to the administrator TRANSPORTATION From navigation go to transportation View transportation available ………………………………………………………………………………………………...... PARENT PANEL DASHBOARD ………………………………………………………………………………………………….. Total number of students, teachers, parents and attendance of student for that day at a glance. Dashboard also holds a calendar for showing events. CHILDREN MARKS From navigation go to exam marks See the mark of your children individually One parent can have multiple children PAYMENTS From navigation go to exam > payment View the invoices of your children and individually Make payment via paypal online CLASS ROUTINE From navigation go to class routine Get the class routine for each of your child separately MESSAGING From navigating go to message Send message to teachers and admin Get the message sent to you NEWS From navigation go to view news View all the uploaded news TODAY’S THOUGHT From navigation go to today’s thought View all the uploaded today’s thought HOLIDAY DATES From navigation go to holiday View all the holiday with their respectives dates HELPFUL LINKS From navigation go to helpful links View all the helpful links HELP DESK From navigation go to help desk Submit or create help desk to the administrator

DummyGram is a social media application where we have posts, stories, chat, friends, authentication, comment, delete, share and like feature. It uses ReactJs in the frontend for the UI and Firebase for the backend storing the users, posts, stories and comments.

An ANN is a model based on a collection of connected units or nodes called "artificial neurons", which loosely model the neurons in a biological brain. Each connection, like the synapses in a biological brain, can transmit information, a "signal", from one artificial neuron to another. An artificial neuron that receives a signal can process it and then signal additional artificial neurons connected to it. In common ANN implementations, the signal at a connection between artificial neurons is a real number, and the output of each artificial neuron is computed by some non-linear function of the sum of its inputs. The connections between artificial neurons are called "edges". Artificial neurons and edges typically have a weight that adjusts as learning proceeds. The weight increases or decreases the strength of the signal at a connection. Artificial neurons may have a threshold such that the signal is only sent if the aggregate signal crosses that threshold. Typically, artificial neurons are aggregated into layers. Different layers may perform different kinds of transformations on their inputs. Signals travel from the first layer (the input layer) to the last layer (the output layer), possibly after traversing the layers multiple times. The original goal of the ANN approach was to solve problems in the same way that a human brain would. However, over time, attention moved to performing specific tasks, leading to deviations from biology. Artificial neural networks have been used on a variety of tasks, including computer vision, speech recognition, machine translation, social network filtering, playing board and video games and medical diagnosis. Deep learning consists of multiple hidden layers in an artificial neural network. This approach tries to model the way the human brain processes light and sound into vision and hearing. Some successful applications of deep learning are computer vision and speech recognition.[68] Decision trees Main article: Decision tree learning Decision tree learning uses a decision tree as a predictive model to go from observations about an item (represented in the branches) to conclusions about the item's target value (represented in the leaves). It is one of the predictive modeling approaches used in statistics, data mining, and machine learning. Tree models where the target variable can take a discrete set of values are called classification trees; in these tree structures, leaves represent class labels and branches represent conjunctions of features that lead to those class labels. Decision trees where the target variable can take continuous values (typically real numbers) are called regression trees. In decision analysis, a decision tree can be used to visually and explicitly represent decisions and decision making. In data mining, a decision tree describes data, but the resulting classification tree can be an input for decision making. Support vector machines Main article: Support vector machines Support vector machines (SVMs), also known as support vector networks, are a set of related supervised learning methods used for classification and regression. Given a set of training examples, each marked as belonging to one of two categories, an SVM training algorithm builds a model that predicts whether a new example falls into one category or the other.[69] An SVM training algorithm is a non-probabilistic, binary, linear classifier, although methods such as Platt scaling exist to use SVM in a probabilistic classification setting. In addition to performing linear classification, SVMs can efficiently perform a non-linear classification using what is called the kernel trick, implicitly mapping their inputs into high-dimensional feature spaces. Illustration of linear regression on a data set. Regression analysis Main article: Regression analysis Regression analysis encompasses a large variety of statistical methods to estimate the relationship between input variables and their associated features. Its most common form is linear regression, where a single line is drawn to best fit the given data according to a mathematical criterion such as ordinary least squares. The latter is often extended by regularization (mathematics) methods to mitigate overfitting and bias, as in ridge regression. When dealing with non-linear problems, go-to models include polynomial regression (for example, used for trendline fitting in Microsoft Excel[70]), logistic regression (often used in statistical classification) or even kernel regression, which introduces non-linearity by taking advantage of the kernel trick to implicitly map input variables to higher-dimensional space. Bayesian networks Main article: Bayesian network A simple Bayesian network. Rain influences whether the sprinkler is activated, and both rain and the sprinkler influence whether the grass is wet. A Bayesian network, belief network, or directed acyclic graphical model is a probabilistic graphical model that represents a set of random variables and their conditional independence with a directed acyclic graph (DAG). For example, a Bayesian network could represent the probabilistic relationships between diseases and symptoms. Given symptoms, the network can be used to compute the probabilities of the presence of various diseases. Efficient algorithms exist that perform inference and learning. Bayesian networks that model sequences of variables, like speech signals or protein sequences, are called dynamic Bayesian networks. Generalizations of Bayesian networks that can represent and solve decision problems under uncertainty are called influence diagrams. Genetic algorithms Main article: Genetic algorithm A genetic algorithm (GA) is a search algorithm and heuristic technique that mimics the process of natural selection, using methods such as mutation and crossover to generate new genotypes in the hope of finding good solutions to a given problem. In machine learning, genetic algorithms were used in the 1980s and 1990s.[71][72] Conversely, machine learning techniques have been used to improve the performance of genetic and evolutionary algorithms.[73] Training models Usually, machine learning models require a lot of data in order for them to perform well. Usually, when training a machine learning model, one needs to collect a large, representative sample of data from a training set. Data from the training set can be as varied as a corpus of text, a collection of images, and data collected from individual users of a service. Overfitting is something to watch out for when training a machine learning model. Federated learning Main article: Federated learning Federated learning is an adapted form of distributed artificial intelligence to training machine learning models that decentralizes the training process, allowing for users' privacy to be maintained by not needing to send their data to a centralized server. This also increases efficiency by decentralizing the training process to many devices. For example, Gboard uses federated machine learning to train search query prediction models on users' mobile phones without having to send individual searches back to Google.[74] Applications There are many applications for machine learning, including: Agriculture Anatomy Adaptive websites Affective computing Banking Bioinformatics Brain–machine interfaces Cheminformatics Citizen science Computer networks Computer vision Credit-card fraud detection Data quality DNA sequence classification Economics Financial market analysis[75] General game playing Handwriting recognition Information retrieval Insurance Internet fraud detection Linguistics Machine learning control Machine perception Machine translation Marketing Medical diagnosis Natural language processing Natural language understanding Online advertising Optimization Recommender systems Robot locomotion Search engines Sentiment analysis Sequence mining Software engineering Speech recognition Structural health monitoring Syntactic pattern recognition Telecommunication Theorem proving Time series forecasting User behavior analytics In 2006, the media-services provider Netflix held the first "Netflix Prize" competition to find a program to better predict user preferences and improve the accuracy of its existing Cinematch movie recommendation algorithm by at least 10%. A joint team made up of researchers from AT&T Labs-Research in collaboration with the teams Big Chaos and Pragmatic Theory built an ensemble model to win the Grand Prize in 2009 for $1 million.[76] Shortly after the prize was awarded, Netflix realized that viewers' ratings were not the best indicators of their viewing patterns ("everything is a recommendation") and they changed their recommendation engine accordingly.[77] In 2010 The Wall Street Journal wrote about the firm Rebellion Research and their use of machine learning to predict the financial crisis.[78] In 2012, co-founder of Sun Microsystems, Vinod Khosla, predicted that 80% of medical doctors' jobs would be lost in the next two decades to automated machine learning medical diagnostic software.[79] In 2014, it was reported that a machine learning algorithm had been applied in the field of art history to study fine art paintings and that it may have revealed previously unrecognized influences among artists.[80] In 2019 Springer Nature published the first research book created using machine learning.[81] Limitations Although machine learning has been transformative in some fields, machine-learning programs often fail to deliver expected results.[82][83][84] Reasons for this are numerous: lack of (suitable) data, lack of access to the data, data bias, privacy problems, badly chosen tasks and algorithms, wrong tools and people, lack of resources, and evaluation problems.[85] In 2018, a self-driving car from Uber failed to detect a pedestrian, who was killed after a collision.[86] Attempts to use machine learning in healthcare with the IBM Watson system failed to deliver even after years of time and billions of dollars invested.[87][88] Bias Main article: Algorithmic bias Machine learning approaches in particular can suffer from different data biases. A machine learning system trained on current customers only may not be able to predict the needs of new customer groups that are not represented in the training data. When trained on man-made data, machine learning is likely to pick up the same constitutional and unconscious biases already present in society.[89] Language models learned from data have been shown to contain human-like biases.[90][91] Machine learning systems used for criminal risk assessment have been found to be biased against black people.[92][93] In 2015, Google photos would often tag black people as gorillas,[94] and in 2018 this still was not well resolved, but Google reportedly was still using the workaround to remove all gorillas from the training data, and thus was not able to recognize real gorillas at all.[95] Similar issues with recognizing non-white people have been found in many other systems.[96] In 2016, Microsoft tested a chatbot that learned from Twitter, and it quickly picked up racist and sexist language.[97] Because of such challenges, the effective use of machine learning may take longer to be adopted in other domains.[98] Concern for fairness in machine learning, that is, reducing bias in machine learning and propelling its use for human good is increasingly expressed by artificial intelligence scientists, including Fei-Fei Li, who reminds engineers that "There’s nothing artificial about AI...It’s inspired by people, it’s created by people, and—most importantly—it impacts people. It is a powerful tool we are only just beginning to understand, and that is a profound responsibility.”[99] Model assessments Classification of machine learning models can be validated by accuracy estimation techniques like the holdout method, which splits the data in a training and test set (conventionally 2/3 training set and 1/3 test set designation) and evaluates the performance of the training model on the test set. In comparison, the K-fold-cross-validation method randomly partitions the data into K subsets and then K experiments are performed each respectively considering 1 subset for evaluation and the remaining K-1 subsets for training the model. In addition to the holdout and cross-validation methods, bootstrap, which samples n instances with replacement from the dataset, can be used to assess model accuracy.[100] In addition to overall accuracy, investigators frequently report sensitivity and specificity meaning True Positive Rate (TPR) and True Negative Rate (TNR) respectively. Similarly, investigators sometimes report the false positive rate (FPR) as well as the false negative rate (FNR). However, these rates are ratios that fail to reveal their numerators and denominators. The total operating characteristic (TOC) is an effective method to express a model's diagnostic ability. TOC shows the numerators and denominators of the previously mentioned rates, thus TOC provides more information than the commonly used receiver operating characteristic (ROC) and ROC's associated area under the curve (AUC).[101] Ethics Machine learning poses a host of ethical questions. Systems which are trained on datasets collected with biases may exhibit these biases upon use (algorithmic bias), thus digitizing cultural prejudices.[102] For example, using job hiring data from a firm with racist hiring policies may lead to a machine learning system duplicating the bias by scoring job applicants against similarity to previous successful applicants.[103][104] Responsible collection of data and documentation of algorithmic rules used by a system thus is a critical part of machine learning. Because human languages contain biases, machines trained on language corpora will necessarily also learn these biases.[105][106] Other forms of ethical challenges, not related to personal biases, are more seen in health care. There are concerns among health care professionals that these systems might not be designed in the public's interest but as income-generating machines. This is especially true in the United States where there is a long-standing ethical dilemma of improving health care, but also increasing profits. For example, the algorithms could be designed to provide patients with unnecessary tests or medication in which the algorithm's proprietary owners hold stakes. There is huge potential for machine learning in health care to provide professionals a great tool to diagnose, medicate, and even plan recovery paths for patients, but this will not happen until the personal biases mentioned previously, and these "greed" biases are addressed.[107] Hardware Since the 2010s, advances in both machine learning algorithms and computer hardware have led to more efficient methods for training deep neural networks (a particular narrow subdomain of machine learning) that contain many layers of non-linear hidden units.[108] By 2019, graphic processing units (GPUs), often with AI-specific enhancements, had displaced CPUs as the dominant method of training large-scale commercial cloud AI.[109] OpenAI estimated the hardware compute used in the largest deep learning projects from AlexNet (2012) to AlphaZero (2017), and found a 300,000-fold increase in the amount of compute required, with a doubling-time trendline of 3.4 months.[110][111] Software Software suites containing a variety of machine learning algorithms include the following: Free and open-source so

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