Machine Learning:What is Machine Learning？2021-02-22 15:53:35What is machine learning？ Machine learning is to find functions automatically.For example, speech recognition, image recognition, playing go, dialogue system… 1.regression prediction 2.binary ...
Machine learning is to find functions automatically.For example, speech recognition, image recognition, playing go, dialogue system…
Output is yes or no.
Let the machine do multiple choice questions.The machine selects the correct one in the options.
Produce structured complex things.Like images,sentences created like a human.How to tell the machine what kind of function to look for？
Labeled data.Need to give the machine some labeled data for training.
Judge whether the function is good or bad. The basic idea is as follows: First, the image is given to the function for output, and the output result is compared with the label. The proportion of the correct answer is related to the quality of the function.The smaller the LOSS, the closer to the function we need to find. Next, the machine will automatically select the function with the lowest LOSS value.
The result will allow the machine to evaluate previous decisions.And alpha go both use supervised learning and reinforcement learning.
Unlabeled data.What can machine learn from unlabeled data.
Function Search Range
Linear,Network Architecture,like RNN and CNN.
Function Search Method
Tell us why this result is output.
Deliberately modify the input data to confuse the machine, resulting in an error in its selection function.
Compress the data input and put it on the phone.
Enter something completely different,Can you let the machine know that ‘i don’t know’?
Training data AND testing data.learn by analogy.BUT when testing data totally different with the training data, what tragety will machine choose.
Let machine can learn by itself! learning algorithmn.Can you make the machine smarter？create learning algorithmn.
Machine life-long learning.Continuous learning.
02What is Machine Learning, Deep Learning and Structured Learning.pdf2020-04-18 20:10:0002What is Machine Learning, Deep Learning and Structured Learning
What is Deep learning?2017-03-21 01:14:24What is Machine Learning Two broad classification Supervised Learning Regression Classification Unsupervised Learning What is Machine Learning?One definition of Machine Learning: “A computer program ...
What is Machine Learning?
One definition of Machine Learning: “A computer program is said to learn from experience E with respect to some class of tasks T and performance measure P, if its performance at tasks in T, as measured by P, improves with experience E.”
Two broad classification
In a regression problem, we are trying to predict results within a continuous output, meaning that we are trying to map input variables to some continuous function.
In a classification problem, we are instead trying to predict results in a discrete output. In other words, we are trying to map input variables into discrete categories.
Unsupervised learning allows us to approach problems with little or no idea what our results should look like. We can derive structure from data where we don’t necessarily know the effect of the variables.
With unsupervised learning there is no feedback based on the prediction results.
what is Machine Learning2018-08-15 20:11:47What is machine learning? machine learning : experience—->skill The skill is something which can improve the performance of program Why use machine learning For example,how to recognize ...
What is machine learning?
machine learning : experience—->skill
The skill is something which can improve the performance of program
Why use machine learning
For example,how to recognize a tree？
One way is that,we may write down many rules of the tree(the rules can be so many),once we need to judge a object whether tree or not we can use these rules to determine.But in fact ,we didn’t recongize by this way.Just think how a three-year-old baby do this.They can recongnize the tree after seen a lot of tree,they don’t need to write down rules.Because they have seen too many tree so when they meet a new thing they can determine whether it is a really tree.
PC can recognize a tree like a three-years-old baby,they just need some data to deal with just like to see many trees like for training.And it would be more effective than writing rules.
What fileds can machine learning apply to?
For example,some interesting field
Navigating on Mars: we can not make rules in advance for the reason that we haven’t reach Mars before,we need machine to collect data and use these data to maker decision when it arrive to Mars
Speech/visual recognition: the feature of voice and image is hard to catch, it also means makeing rules is difficlut so it’s better to use machine
High-frequency trading marketing: it’s hard for human beings to make decision in only just seconds in trading market but marchine learning can do it.The program just need to be trained by the data earlier in the trading market and it would make decision for the later quickly.
Consumer-targeted marketing : make service for people in a large scale in the case the service is targeted,we can’t do it by artificial method,we need use machine learning
What problems is suitable for machine learning
There are three keys which would determine whether a problem fit to machine learning:
(1)Exists some underlying pattern to be bearning
(2)It’s hard to definite rule
(3)There should be a certain amount of data
What’s the aim of machine learning?
We have some input:x and some output:y==>(x,y)
There exists a underlying function f which make f(x)=y,but we don’t know the function f
So we should find hypothesis g : g f,there could be many function g ,but we need to chose the best one
What is the difference between machine learning,data mining,artical intelligence and statistics?
Machine learning: use data to compute hypothesis g targeted f
Data mining: use huge data to find property that is interesting, when the interesting property is hypothesis ,data mining ==machine learning
Artificical Intelligence : compute something that shows intelligent behavior,machine learning can relaize AI
Statistics :use data to make inferenceabout unknown process,traditionaly statistics values useing math provable result ,but machine learning puts highlight on computing data.Statistics can be used to realize ML,provides tools for ML
What is Machine Learning ?2019-01-22 18:18:05一、What is Machine Learning ? Two definitions of Machine Learning are offered. 1、Arthur Samuel described it as: “the field of study that gives computers the ability to learn withou...
开始Machine Learning !
一、What is Machine Learning ?
Two definitions of Machine Learning are offered.
1、Arthur Samuel described it as: “the field of study that gives computers the ability to learn without being explicitly programmed.” This is an older, informal definition.
2、Tom Mitchell provides a more modern definition: “A computer program is said to learn from experience E with respect to some class of tasks T and performance measure P, if its performance at tasks in T, as measured by P, improves with experience E.”
E = the experience of playing many games of checkers
T = the task of playing checkers.
P = the probability that the program will win the next game.( performance measure:性能指标）
In general, any machine learning problem can be assigned to one of two broad classifications:
Supervised learning and Unsupervised learning.
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