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What are Different Types of Learning in Machine Learning?

  • Ayush Singh Rawat
  • Jun 03, 2021
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Machine learning has come a long way from its synthesis and has come to the phase where it keeps on evolving by each passing day.


Pundits predict that Machine learning is the future and with every new invention, it will indeed surpass human expectations and mannerisms one day.


Let’s find out what are the different types of learnings involved with machine learning.



What is Machine Learning?


Machine learning is a subset of artificial intelligence (AI) that focuses on learning new data and improving their accuracy over time to build new applications without being programmed to do so. 


It allows computers to learn and create their own theories so that they become more familiar with human behaviour. This is done with the least human interaction possible, i.e. no overt programming. 


The learning process is automated and progressed in accordance to the machines' actions taken on the task in hand. Machine-learning models are created based on the data that is fed to the machines along with the different algorithms.


If you want to learn more about machine learning, click on the link, “Machine Learning Tutorial



Different Types of Learning


Since the emphasis of the machine learning area is "learning," there are many kinds of practises that you will find.


Other methods of learning, such as "supervised learning," refer to entire subfields of analysis made up of several different types of algorithms. Others, such as "transfer learning," explain effective strategies you might use on your tasks.


There are possibly 14 different forms of learning based on different types of techniques that a machine can execute: 

 Displaying different types of learning in machine learning.

Different types learning of Machine Learning

Learning problems


  • Supervised learning 


Supervised learning is a form of machine learning in which machines are taught using well-labeled training data and then predict results using that data. The labelled data ensures that certain input data have the right output already marked.


The training data supplied to the machines in supervised learning work like a supervisor who trains the machines to accurately forecast the results. It uses the same principle that a pupil knows through the teacher's supervision.


In the real-world, supervised learning can be used for Risk Assessment, Image classification, Fraud Detection, spam filtering, etc.


  • Unsupervised learning 


Unsupervised machine learning algorithms predict patterns from a dataset without using recognised or labelled outcomes as a guide. 


Unsupervised machine learning techniques, unlike supervised machine learning, cannot be immediately extended to a regression or classification problem since the values for the output data are unknown, making it difficult to train the algorithm as you would usually. Instead, unsupervised learning can be used to uncover the data's underlying structure.


When you don't have any information on desired results, such as assessing a target demand for a completely new product that your company has never sold before, unsupervised machine learning is the safest option. 


If you want to get a greater understanding of your current customer base, though, supervised learning is the best method.


  • Reinforcement learning 


The teaching of machine learning models to make a series of decisions is known as reinforcement learning. In an unpredictable, especially challenging world, the agent learns to accomplish an objective. Artificial intelligence faces a game-like scenario in reinforcement learning


To find a solution to the problem, the machine uses trial and error. Artificial intelligence is given either incentives or fines for the actions it does in order to get it to do what the creator wishes. Its aim is to increase the overall payout as much as possible.


In the fact that the designer establishes the incentive policy–that is, the game's rules–he provides the model with no tips or advice about how to solve the game. 


Starting with completely random trials and progressing to advanced techniques and superhuman abilities, it's up to the model to work out how to accomplish the challenge in order to optimise the reward. 


(Most related: Inverse Reinforcement Learning)


Hybrid Learning Problems


  • Semi-supervised learning 


Semi-supervised machine learning is a hybrid between supervised and unsupervised learning techniques. 


It employs a small volume of labelled data and a huge amount of unlabeled data, combining the advantages of both unsupervised and supervised learning while avoiding the difficulties associated with locating large amounts of labelled data. 


As a result, you can train a model to mark data without using as many labelled training data.


As a result, semi-supervised learning enables the algorithm to learn from a limited number of classified text documents while classifying a vast number of unlabeled text documents in the training results.


  • Self-supervised learning 


Self-supervised learning is a method of teaching machines to perform activities without the assistance of humans (for example, an image of a dog followed by the word "dog"). 


It is a subset of unsupervised learning in which outputs or goals are produced by machines that mark, categorise, and interpret data on their own before drawing conclusions based on associations and correlations.


Since it does not require human feedback in the context of data tagging, self-supervised learning can be considered an autonomous form of supervised learning. 


Self-supervised learning, in contrast to unsupervised learning, does not rely on clustering and sorting, which are generally synonymous with unsupervised learning.


  • Multi-instance learning 


Multiple-instance learning (MIL) is a form of supervised learning in machine learning. Instead of obtaining a collection of labelled instances, the learner receives a set of labelled bags, each containing several instances. 


In the simplest case of multiple-instance binary classification, a bag is called negative if any of its instances are negative. A pocket, on the other hand, is labelled positive if it contains at least one positive case.


The learner attempts to either trigger:


  • a principle that will correctly identify individual instances from a series of labelled bags or 

  • learn how to label bags without inducing the concept.


(Must check: Types of Machine Learning)


Statistical Inference


  • Inductive learning 


Inductive learning, also known as Concept Learning, is a method by which AI systems attempt to use a generalised rule to carry out observations. 


The data is obtained as a result of machine learning or from domain experts (humans), and it is used to drive algorithms known as Inductive Learning Algorithms (ALIs), which are used to generate a set of classification rules.


Inductive learning, also known as discovery learning, is a process in which the learner discovers rules by observing examples. This differs from deductive learning, in which students are given rules to follow.


  • Deductive Inference 


Deductive reasoning is the process of inferring new knowledge from previously existing information that is logically connected. It is a form of valid logic, which implies that the conclusion of the case must be true if the claims are true.


In AI, deductive reasoning is a method of propositional logic that involves a variety of rules and evidence. It is often referred to as top-down logic, because it is diametrically opposed to inductive reasoning.


The validity of the inference assures the truth of the statement of deductive reasoning.Deductive reasoning usually begins with basic principles and progresses to a particular conclusion.


  • Transductive learning


Vladimir Vapnik pioneered transductive instruction. It was inspired by the idea that it is less difficult than inductive learning, provided that inductive learning attempts to learn a general function to solve a particular problem, while transductive learning attempts to learn a specific function for the problem at hand.


Transductive learning methods, as opposed to inductive learning, have already observed all of the results, both the teaching and research datasets. 


We use the previously observed training dataset to predict the labels of the experimental dataset. 


And if we don't know what the names of the research datasets are, we will use the themes and additional knowledge in this data to aid in the learning phase.


(Referred blog: Machine Learning Tools)


Learning Techniques


  • Multi-task learning 


Multi-task learning (MTL) is a subset of machine learning in which a collaborative model learns several tasks at the same time. Such approaches include benefits such as increased data reliability, reduced overfitting via mutual representations, and rapid learning via auxiliary content.


However, concurrent learning of various tasks introduces additional architecture and optimization problems, and deciding which tasks can be learned simultaneously is a non-trivial problem in and of itself.


To perform MTL, we usually train a single model or an ensemble of models to perform the desired task. The models are then fine-tuned and tweaked until their output no longer improves. 


While we can normally produce satisfactory results in this manner, by being laser-focused on a particular mission, we neglect facts that might help us do much better on the criterion we care for. 


This knowledge is derived specifically from the preparation signals of similar activities. We will improve our model's generalisation on our original task by exchanging representations between similar tasks.


  • Active learning


Active learning is a branch of machine learning in which a learning algorithm can communicate with a user to mark data with the desired outputs.


The algorithm in active learning proactively selects the subset of examples to be classified next from a pool of unlabeled data. 


The core belief behind the active learner algorithm idea is that allowing an ML algorithm to select the data it needs to learn from allows it to theoretically achieve a higher degree of precision by using a limited number of training labels.


As a result, successful learners are permitted to ask questions interactively at the training stage. These queries typically take the form of unlabeled data instances, with a request to a human annotator to mark the case. 


As a result, active learning becomes a component of the human-in-the-loop model, where it is one of the most important examples of performance.


  • Online learning 


At its most basic form, online learning is a Machine Learning technique that absorbs samples of real-time data one observation at a time.


Through more realistic batch algorithms, online learning models process one sample of data at a time, making them considerably more effective in both time and space.


There is no denying that data is increasingly spreading – in all realms. Although the promise of these vast data sets is enormous, making sense of them necessitates new methods of creation and learning approaches to solve the numerous challenges.


Online learning can be applied to problems in which samples are introduced over time and the probability distribution of the samples is predicted to change over time.


  • Transfer learning


The experience of an already qualified machine learning model is transferred to a separate but similar issue in transfer learning. 


For example, if you trained a basic classifier to predict if a picture contains a backpack, you might use the model's training expertise to identify other items such as sunglasses.


Pass learning entails attempting to use what has been learned in one task to enhance generalisation in another. We pass the weights learned by a network at "task A" to a new "task B."


  • Ensemble learning


By integrating many models, ensemble learning improves machine learning results. As compared to a single model, this approach produces improved predictive results. 


As a result, ensemble approaches have won several prestigious machine learning contests, including the Netflix Award, KDD 2009, and Kaggle.


Ensemble approaches are meta-algorithms that incorporate several machine learning strategies into a single predictive model to reduce uncertainty (bagging), bias (boosting), or increase predictions (stacking).


Also check: What is Automated Machine Learning (AutoML)?





After getting to know all the different types of learnings involved with machine learning, one can only assume the resources and man-power that is put to use to make the machines become more humane.


(Recommended blog: Machine Learning Applications)


These learnings also tell us that how complex humans are, even though it takes us a split of a second to make a decision, it might take a lot of synthesising and processing of information for a computer to commit to the same activity.

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