How does artificial intelligence learn?

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      Today, artificial intelligence helps doctors diagnose patients, pilots fly commercial aircraft, and city planners predict traffic.

      Let’s start with the phrase artificial intelligence / First, say it slowly: ar-ti-fi-cial in-tel-li-gence / The spelling is A-R-T-I-F-I-C-I-A-L, I-N-T-E-L-L-I-G-E-N-C-E / Artificial intelligence is a smart computer system / It can do things that require thinking, for example helping doctors or pilots / It has a short name, AI, and this short form is easier to pronounce /

      Next up is the word diagnose / Diagnose means to find out what illness a person has / For example, when you’re sick and go to the doctor, the doctor will diagnose you, they will figure out what’s wrong /

      Moving on to the word patient / A patient is a person who is sick and sees a doctor / So in the sentence, doctors help patients, these are people who need medical help /

      Let’s talk about the word commercial / Commercial means it is for business / It is not for your family or the army, it is for making money or public service / For example, a commercial store is a store that sells things to people /

      Next is the word aircraft / An aircraft is a machine that flies in the air / Planes are aircraft / So commercial aircraft are planes used for business, like the planes that take people on trips /

      Let’s move to the word planner / A planner is a person who makes plans / A city planner is someone who makes plans for cities, for example deciding where roads or parks should be /

      Up next is the word predict / Predict means to say what will happen before it happens / For example, if you think it will rain tomorrow, you predict rain /

      Finally, let’s cover the word traffic / Traffic is all the cars, buses, and other vehicles moving on roads / When you look out the window and see lots of cars on the street, that is traffic /

      But no matter what these AIs are doing, the computer scientists who designed them likely don’t know exactly how they’re doing it.

      Let’s start with the phrase no matter / “No matter” means it doesn’t matter or whatever happens / For example, you can say no matter if you’re early or late, I’ll wait for you / It tells us something stays the same, regardless of the situation / It’s super useful in daily conversation /

      Next up is the word computer / A computer is a machine that can work, play games, or help us learn / You might have a computer at home, or use one at school, like laptops or desktops / It’s easy to remember /

      Moving on to the word scientists / Scientists are people who study the world, they try to learn how things work / For example, people who study stars are scientists, and people who make artificial intelligence are computer scientists, that’s the phrase from the sentence /

      Let’s talk about the word design / Design means to make a plan for something or create something new / For example, my sister designs pretty cards for birthdays / In our sentence, computer scientists designed AI, they created it and made a plan for how it works /

      Next is the word likely / Likely means probably or it’s possible / For example, it’s likely to rain this afternoon means it will probably rain this afternoon / So in the sentence, scientists likely don’t know means they probably don’t know /

      Finally, let’s cover the word exactly / Exactly means completely or in a very precise way / For example, if someone asks is this your pen, you can say exactly / That means yes, that’s totally right / In the sentence, they don’t know exactly means they don’t know in a precise and clear way /

      This is because artificial intelligence is often self-taught, working off a simple set of instructions to create a unique array of rules and strategies.

      Let’s start with the phrase self-taught / Self-taught means you learn something by yourself, with no teacher and no classes / For example, my brother is self-taught, he learned to play the guitar by watching YouTube videos / So AI is self-taught, it learns on its own /

      Next up is the phrase work off / This is a common phrasal verb / It means to use something as a base or to operate using something / For example, the small robot works off a remote control / In our sentence, AI works off instructions, it uses instructions to do things /

      Moving on to the phrase a set of / A set of means one group of similar things / It’s super common / For example, you can say a set of pencils, that could be 5 or 10 pencils together, or a set of keys, all the keys for your home / It’s easy to understand /

      Let’s talk about the word instruction / An instruction is a clear direction, something you are told to do / For example, the cake recipe has simple instructions, mix flour and eggs / For AI, instructions are the simple things we tell it to start with /

      Next is the phrase a unique array of / Unique means special or one of a kind / Array just means a group, similar to a set of but a little more formal / So a unique array of means a special group of / For example, the store has a unique array of toys, you can’t find them anywhere else / In the sentence, AI makes a unique array of rules, special rules only it has /

      Finally, let’s cover the word strategy / A strategy is a plan to do something well / For example, my strategy for learning English is to listen to this podcast every day / AI has strategies to finish its tasks /

      So how exactly does a machine learn?

      Let’s start with the word machine / A machine is a thing that helps us do work, like a phone, a computer, a bike, or even a toaster / All these things are machines / In the sentence, machine means the AI device we’re talking about, it’s simple to understand /

      There are many different ways to build self-teaching programs.

      Next up is the word way / Way here means a method or how you do something / It’s a super common word / For example, you can ask what’s your way to practice English, that means how do you practice English / Or you can say there are many ways to cook eggs / It’s perfect for daily talk /

      Moving on to the word build / Build means to make or create something, usually step by step / For example, kids love to build towers with blocks / Or we can build a small house with wood / In the sentence, build self-teaching programs means create programs that learn by themselves /

      Let’s talk about the phrase self-teaching / Remember self-taught from earlier, it’s similar / Self-teaching means able to learn by itself for things, or learning by yourself for people / For example, this is a self-teaching English book, you can learn without a teacher / So self-teaching programs are programs that learn on their own /

      Next is the word program / A program is a set of instructions that tells a machine what to do / Like the apps on your phone, they’re programs / Or the game you play on a computer, that’s also a program / In the sentence, it’s the AI program we’ve been talking about /

      But they all rely on the three basic types of machine learning: unsupervised learning, supervised learning, and reinforcement learning.

      Let’s start with the phrase in action / It means actually working or being used, not just talking about it / For example, we talked about the new tool, now let’s see it in action, watch how it opens bottles / In the sentence, see these in action means see the three types of machine learning actually working /

      Next up is the word imagine / It means to picture something in your mind, like daydreaming but on purpose / For example, imagine you have a big ice cream, how happy are you / Or imagine a world with no cars, only bikes / It’s super easy to use /

      Moving on to the word researcher / A researcher is a person who studies something to learn new things / For example, researchers look at stars to know more about space / Or medical researchers try to find ways to cure sick people /

      Let’s talk about the word pull / Usually, pull means to drag something, like pulling a door open / But here it means to get or collect information or data, that’s a common use in tech or study / For example, the teacher pulls student grades from the computer / In the sentence, pull information means get information /

      Next is the word information / It means facts or details about something or someone / For example, I need information about the train, what time does it leave / Or this book has lots of information about dogs /

      Let’s cover the word medical / It means related to doctors, hospitals, or being sick / For example, my mom works in a medical office, she helps doctors / Or medical tools are things doctors use, like thermometers /

      Next up is the word data / It’s like lots of information put together, usually in numbers or words for study / For example, the app collects data about how much we walk / Or teachers look at test data to help students / It’s similar to information but more about a group of facts /

      Moving on to the word profile / It means a short document with key information about a person or thing / For example, a job profile tells you what the job needs / Or my phone has a profile with my name and photo /

      Let’s talk about the phrase patient profile / We know patient means a sick person who sees a doctor, and profile means a document with info / So a patient profile is a document with key information about a patient, like their illness, age, or test results / For example, hospitals keep a patient profile for every person who comes in /

      To see these in action, let’s imagine researchers are trying to pull information from a set of medical data containing thousands of patient profiles.

      Let’s start with the phrase rely on / It’s a common phrase, it means to depend on or to use something for help / For example, I rely on my alarm clock to wake up on time / Or birds rely on wings to fly / In the sentence, all rely on means all use the three basic types to work /

      Next up is the word basic / It means simple or the most important first part / For example, first learn basic English words, like hello and thank you / Or basic math is adding and subtracting / It’s super easy to remember /

      Moving on to the word type / It means a kind or a group of similar things / For example, there are many types of fruit, apples, bananas, oranges / Or what type of music do you like / In the sentence, basic types means basic kinds of machine learning /

      Let’s talk about the phrase machine learning / We know machine means a tool like a computer, and learning means studying to get better / So machine learning is a tech term, it means when machines like computers learn by themselves, without people teaching every step / It’s the big topic we’re talking about /

      Next is the word unsupervised / The prefix un- means not / So it means not supervised, we’ll learn supervised next / For unsupervised learning, it’s the type of machine learning where the machine learns alone, no people guiding it / For example, unsupervised learning is like a kid figuring out toys by themselves, no one telling them how /

      Let’s cover the word supervised / It means having someone watch and guide you / For example, when you cook with your mom, that’s supervised, she helps you / So supervised learning is when the machine learns with people’s help and checks /

      Finally, let’s talk about the word reinforcement / It means making something stronger or giving feedback to get better / For example, practicing speaking every day is reinforcement for your English / For reinforcement learning, it’s when the machine learns by getting feedback, like good job or try again, to get better step by step /

      First up, unsupervised learning.

      Let’s start with the phrase first up / It’s a casual and friendly phrase, it means next or the first one we’re going to talk about / It’s super common when introducing things one by one / For example, we have three games to play, first up is hide-and-seek / Or today’s lessons, first up is new words, then practice sentences / In this sentence, first up unsupervised learning means the first type of machine learning we’re going to talk about is unsupervised learning /

      This approach would be ideal for analyzing all the profiles to find general similarities and useful patterns.

      Let’s start with the word approach / It means a way to do something, just like way we learned before but a little more formal / For example, my approach to learning English is listening to podcasts every day / Or there’s a simple approach to making tea, boil water and add tea leaves /

      Next up is the word ideal / It means perfect for what you need or just right / For example, sunny days are ideal for a picnic / Or this book is ideal for English beginners, it’s not too hard /

      Moving on to the word analyze / It means to look at something carefully to find out how it works or what it has / For example, teachers analyze students' homework to see what they need to learn / Or I analyze my test mistakes to get better next time /

      Let’s talk about the word general / It means affecting most people or things or not specific / For example, a general rule for English is subject plus verb plus object / Or most people have general hobbies like reading or watching TV /

      Next is the word similarity / It means the thing that makes two or more things alike / For example, the similarity between cats and dogs is they both like to play / Or what’s the similarity between apples and pears, they’re both fruit /

      Let’s cover the word useful / It means helpful or good for doing something / For example, a dictionary is useful for learning new words / Or this app is useful, it helps me practice speaking /

      Finally, let’s talk about the word pattern / It means a repeated way something happens or looks / For example, the pattern of the weather in summer is hot and rainy / Or the shirt has a pattern of flowers, they repeat all over /

      Maybe certain patients have similar disease presentations, or perhaps a treatment produces specific sets of side effects.

      Let’s start with the word certain / It means some or particular, not all / For example, certain birds can’t fly, like penguins / Or I have certain books I read every night /

      Next up is the word similar / It means looking or being alike, we learned similarity before and this is the adjective form / For example, my shoes are similar to my sister’s, same color different size / Or cats and tigers have similar faces /

      Moving on to the word disease / It means an illness or sickness / For example, the flu is a common disease in winter / Or doctors help people get better from disease /

      Let’s talk about the word presentation / Here it means how a disease shows itself, its signs or symptoms, not the show meaning / For example, the presentation of a fever is a high body temperature / Or the disease’s presentation includes tiredness and cough /

      Next is the word perhaps / It means maybe or it’s possible, just like likely we learned earlier / For example, perhaps it will snow tomorrow / Or perhaps we can eat pizza for dinner /

      Let’s cover the word treatment / It means the way to help someone get better from illness / For example, the treatment for a cut is cleaning it and putting a bandage on / Or she needs medical treatment for her cold /

      Moving on to the word produce / As a verb here it means to cause or make something happen / For example, sunlight helps plants produce food / Or this machine produces clean water / In the sentence it means a treatment causes side effects /

      Let’s talk about the word specific / It means exact or clear, not general / For example, I want a specific color, bright blue not dark blue / Or she has a specific time to study, 7 PM every day /

      Next up is the phrase sets of / It’s the plural of a set of which we learned before / It means groups of similar things / For example, the store sells sets of cups, each set has 4 cups / Or he has sets of stamps from different countries /

      Finally, let’s cover the phrase side effect / It’s a fixed phrase, it means an extra usually bad result from medicine or treatment / For example, this allergy medicine works but a side effect is sleepiness / Or the treatment’s side effect is a mild headache /

      This broad pattern-seeking approach can be used to identify similarities between patient profiles and find emerging patterns, all without human guidance.

      Let’s start with the word broad / It means wide in range or covering many things, not narrow / For example, she has broad interests, she likes reading sports and music / Or this book gives a broad introduction to AI /

      Next up is the phrase pattern-seeking / It’s a combination of pattern which means a repeated way and seeking which means looking for / So it means looking for patterns or rules in things / For example, kids love pattern-seeking games, like finding which shape comes next / In the sentence it’s about AI looking for patterns in data /

      Moving on to the word identify / It means to find or recognize something clearly / For example, can you identify your bag, it looks like mine / Or the doctor can identify the problem quickly /

      Let’s talk about the word emerging / It means starting to appear or develop, new and growing / For example, emerging trends in fashion, like bright colors this year / Or we need to watch emerging problems before they get big / In the sentence emerging patterns means patterns that are just starting to show up /

      Finally, let’s cover the word guidance / It means help advice or direction from someone / For example, my mom gives me guidance when I’m confused / Or new employees need guidance to do their jobs well / In the sentence human guidance means help from people /

      But let’s imagine doctors are looking for something more specific.

      Let’s start with the phrase looking for / It’s a super common phrase, it means trying to find something or someone / For example, I’m looking for my keys, have you seen them / Or she’s looking for a good book to read / In this sentence doctors are looking for something more specific means doctors are trying to find something more exact / It’s easy to use in daily life, just say I’m looking for plus what you want /

      These physicians want to create an algorithm for diagnosing a particular condition.

      Let’s start with the word physician / It means a doctor, it’s a more formal word for doctor often used for medical experts / For example, my aunt is a physician, she works in a hospital and treats sick people / In the sentence it’s the same as doctors we’ve talked about before /

      Next up is the word algorithm / It’s a tech word, it means a set of simple steps a machine like a computer follows to finish a job / For example, the app uses an algorithm to recommend songs you might like / In the sentence it’s the steps the machine uses to diagnose illness /

      Moving on to the word particular / It means specific or exact, just like specific we learned earlier / For example, I don’t want any book, I want that particular one on the shelf / In the sentence a particular condition means a specific illness /

      Finally, let’s talk about the word condition / Here it means an illness or health problem, not the rule or situation meaning / For example, cold weather can make his lung condition worse / In the sentence it’s the illness doctors want to diagnose /

      They begin by collecting two sets of data——medical images and test results from both healthy patients and those diagnosed with the condition.

      Let’s start with the word collect / It means to gather or bring things together / For example, I collect stamps from different countries / Or doctors collect blood samples to test for illness / In the sentence it means doctors gather medical images and test results /

      Next up is the phrase medical image / We know medical means related to doctors or health and image means a picture / So a medical image is a picture taken for health checks / For example, an X-ray is a common medical image, doctors use it to see bones / Or the medical image shows if the lungs are healthy /

      Moving on to the phrase test result / Test is a check to find out about health and result is what you get after the check / So test result is the outcome of a medical check / For example, the blood test result says she’s healthy / Or we wait for the test result to know what’s wrong /

      Finally, let’s cover the word healthy / It means not sick or in good health / For example, eating vegetables keeps you healthy / Or a healthy person doesn’t get sick easily / In the sentence healthy patients are people who aren’t sick /

      Then, they input this data into a program designed to identify features shared by the sick patients but not the healthy patients.

      Let’s start with the word input / As a verb here it means to put information or data into a machine like a computer / For example, I input my password to unlock my phone / Or she inputs student names into the teacher’s computer / In the sentence it means doctors put medical data into the program /

      Next up is the word feature / It means a special quality or characteristic of something or someone / For example, a key feature of this phone is its big screen / Or long hair is a feature of many cats / In the sentence it’s the special physical or test-related characteristics of patients /

      Moving on to the phrase shared by / It’s a phrase meaning owned or had in common by someone or something / For example, this toy is shared by my brother and me, we both play with it / Or kindness is a trait shared by many good people / In the sentence features shared by the sick patients means characteristics that only sick patients have in common /

      Finally, let’s talk about the word sick / It means not healthy or having an illness, it’s the opposite of healthy we learned earlier / For example, he’s sick with a cold, he has a cough and runny nose / Or if you feel sick go see a doctor / In the sentence sick patients are people who have the particular illness /

      Based on how frequently it sees certain features, the program will assign values to those features' diagnostic significance, generating an algorithm for diagnosing future patients.

      Let’s start with the phrase based on / It’s a common phrase, it means according to or using something as a reason / For example, based on the weather forecast it will be sunny tomorrow / Or I make decisions based on what’s best for me / In the sentence it means the program works according to how often features appear /

      Next up is the word frequently / It’s an adverb, it means often or many times / For example, she frequently calls her grandma / Or cats frequently sleep in the sun / In the sentence it refers to how often certain patient features show up /

      Moving on to the word assign / It means to give or put something like a value or task to someone or something / For example, the teacher assigns homework to students every day / Or the manager assigns jobs to workers / In the sentence the program gives values to the features /

      Let’s talk about the word value / Here it’s a noun, it means a number or amount given to something / For example, the value of this coin is 10 yuan / Or each question in the test has a value of 2 points / In the sentence it’s the number that shows how important a feature is for diagnosis /

      Next is the word diagnostic / It’s an adjective, it means related to diagnosing illness, we learned diagnose before / For example, diagnostic tests help doctors find out what’s wrong / Or this is a diagnostic tool for checking heart health / In the sentence it describes the significance related to diagnosis /

      Let’s cover the word significance / It means importance or how much something matters / For example, the significance of eating well is staying healthy / Or he didn’t understand the significance of the test / In the sentence it’s how important a feature is for diagnosing the illness /

      Moving on to the word generate / It means to create or produce something / For example, the sun generates heat and light / Or this app generates funny stories / In the sentence the program creates an algorithm for diagnosing patients /

      Finally, let’s talk about the word future / It means coming later or not now / For example, I want to be a teacher in the future / Or we plan for the future / In the sentence future patients are people who will need diagnosis later /

      However, unlike unsupervised learning, doctors and computer scientists have an active role in what happens next.

      Let’s start with the word however / It means but, it’s a word for showing contrast just like but but a little more formal / For example, I wanted to go out, however it started raining / Or the task is hard, however we can finish it / In the sentence it’s used to contrast with unsupervised learning /

      Next up is the word unlike / It means not like or different from / For example, unlike my sister I don’t like ice cream / Or unlike summer winter is cold / In the sentence it means supervised learning is different from unsupervised learning /

      Moving on to the phrase active role / Active means doing things not just watching, we learned active before, and role means the part someone plays in something / So active role means a part where you do things and participate / For example, my dad plays an active role in our family, he cooks and helps with homework / In the sentence it means doctors and scientists participate actively /

      Let’s talk about the phrase passive role / It’s the opposite of active role we just learned / Passive means not doing things just watching or letting things happen, and role is still the part someone plays / So passive role means a part where you don’t participate actively, you just let others do the work / For example, in that game I played a passive role, I sat and watched not joining in / Or some students take a passive role in class, they listen but don’t ask questions / It’s the opposite of active role where you do things actively /

      Finally, let’s cover the word happen / It means to take place or to occur / For example, what happened at school today / Or a funny thing happened on the way to the store / In the sentence what happens next means what takes place after that /

      Doctors will make the final diagnosis and check the accuracy of the algorithm’s prediction.

      Let’s start with the word final / It means last or coming at the end / For example, the final class of the day is English / Or we waited for the final decision / In the sentence final diagnosis means the last and confirmed judgment of the illness, that’s the doctor’s final answer /

      Next up is the word diagnosis / It’s a noun, we learned diagnose the verb before / It means the result of diagnosing an illness or what the doctor says is wrong / For example, the doctor gave a diagnosis, she has a cold / Or we need a clear diagnosis to start treatment / In the sentence it’s the doctor’s final illness judgment /

      Moving on to the word check / It means to look at or test something to make sure it’s right or good / For example, I check my bag before leaving home / Or the teacher checks our homework for mistakes / In the sentence it means doctors verify if the algorithm’s prediction is correct /

      Let’s talk about the word accuracy / It means how correct or right something is / For example, the accuracy of this clock is good, it’s never late / Or we need to improve the accuracy of our answers / In the sentence it’s how correct the algorithm’s prediction is /

      Finally, let’s cover the word prediction / It’s a noun, we learned predict the verb before / It means a guess or statement about what will happen / For example, the weather prediction says it will rain / Or his prediction about the game was right / In the sentence it’s the algorithm’s guess about the patient’s illness /

      Then computer scientists can use the updated datasets to adjust the program’s parameters and improve its accuracy.

      Let’s start with the phrase updated dataset / Updated means made new or changed with the latest information, and dataset is a group of related information or data put together / So this phrase means a group of data that has been changed to include the newest information / For example, the teacher uses an updated dataset of students' test scores to check progress / Or the app uses an updated dataset of city maps to show new roads /

      Next up is the word adjust / It’s a verb that means to change something a little bit to make it better or more suitable / For example, I adjust the volume of the radio to hear music clearly / Or she adjusts her study plan to have more time for English /

      Moving on to the word parameters / It’s a plural noun usually used in tech or science / It means the small specific settings or numbers that control how a machine or program works / For example, the camera has parameters like brightness and contrast that you can change / Or the AI program uses parameters to make better predictions /

      Finally, let’s talk about the word improve / It’s a verb that means to make something better or to get better yourself / For example, reading every day helps improve your English / Or we need to improve the way we clean the room to save time /

      This hands-on approach is called supervised learning.

      Let’s start with the phrase hands-on / It’s an adjective that means involving doing things directly not just watching or reading / For example, this is a hands-on English class, we speak and play games not just read books / Or kids love hands-on activities like painting and building blocks / In the sentence it describes a type of learning that needs active participation /

      Next up is the word called / It means named or known as / For example, my dog is called Lucky / Or this kind of fruit is called a mango / In the sentence it’s used to give a name to something, like the hands-on learning method has a specific name /

      Now, let’s say these doctors want to design another algorithm to recommend treatment plans.

      Let’s start with the word recommend / It’s a verb that means to suggest something is good or suitable for someone / For example, my teacher recommends this English podcast for beginners / Or the doctor recommends drinking more water when you have a cold / In the sentence it means the AI or doctor suggests a good way to treat the patient /

      Next up is the phrase treatment plan / We know treatment means the way to help someone get better from illness and plan means a detailed idea of what to do / So this phrase means a detailed step-by-step plan for treating an illness / For example, the doctor made a treatment plan for my cough, take medicine twice a day and rest / Or the treatment plan includes exercise and healthy eating to help the patient recover /

      Since these plans will be implemented in stages, and they may change depending on each individual’s response to treatments, the doctors decide to use reinforcement learning.

      Let’s start with the word since / It has two common meanings / First it means because to show a reason / For example, since it’s raining we stay at home / Second it can mean from the time when to show time / For example, I have learned English since 2020 / In the sentence it’s used to explain a reason /

      Next up is the word implement / It’s a verb that means to carry out or put something into action / For example, the school will implement a new rule next week / Or doctors implement the treatment plan to help patients /

      Moving on to the phrase in stages / It’s a phrase that means step by step not all at once / For example, we will finish the project in stages, first the plan then the work / Or learning a new skill is better done in stages /

      Let’s talk about the phrase depending on / It’s a phrase that means according to or it varies based on something / For example, we will go out depending on the weather / Or the price changes depending on the size /

      Next is the word individual / It’s an adjective that means relating to one single person or thing / For example, each student has an individual learning plan / Or the shop sells individual cakes not big ones /

      Let’s cover the word response / It’s a noun that means a reaction or answer to something / For example, the patient’s response to the treatment was good, he felt better soon / Or I’m waiting for her response to my question /

      Finally, let’s talk about the word decide / It’s a verb that means to make a choice after thinking / For example, I can’t decide which book to buy / Or the doctor will decide the best treatment for you /

      This program uses an iterative approach to gather feedback about which medications, dosages and treatments are most effective.

      Let’s start with the word iterative / It’s an adjective that means doing something again and again each time making small improvements / For example, the iterative process of writing a story means rewriting it many times to make it better / Or AI uses an iterative way to learn, trying getting better and trying again /