Popular Machine Learning Methods You Should Know
So you are at the stage to learn further about machine learning methods. In your venture to lean and understand machine learning, you will find several methods or techniques available. With new methodologies are developed through time, the methods can grow from time to time as well.
A machine learning algorithm is a mathematical phrase which signifies data in the context of a problem. The goal is to transform the data into insight. For instance, if an online retailer would like to anticipate sales for the upcoming quarter, they can use the algorithm which predicts sales based on previous sales.
Another example can be seen by windmill creators. They may visually watch out significant equipment and supply the video data via an algorithm. As a result, it can be trained to identify dangerous cracks. Then, what is the machine learning methods used to create all of these algorithms or models?
The complexity and speed of this field generate new techniques which potentially overwhelming for novice data scientists. If you are a beginner, you may find it hard to learn about every possible method. However, you can start from these simple methods that we are going to discuss below.
Regression Method in Machine Learning
This method is part of supervised machine learning. It helps to explain or predict a certain numerical value depending on a selection of prior data. For instance, it is used to predict a property price regarding the past pricing data for related properties. Linear regression is the simplest technique in this method.
This one of the simplest machine learning methods use the mathematical equation of the line (y=m*x+b) to form a data set. This linear regression model can be trained with lots of data pairs (x,y) by computing the position and slope of a line which reduces the overall distance between all data points and the line.
For example, this regression method can be used to forecast the energy consumption of particular buildings by collecting the age of the building, square feet, and a number of stories. Because there is more than one input like age, square feet, and others, you can employ a variety of linear regressions.
Aside from linear regression, there are some other techniques available. This method runs the range of simple to complex techniques like polynomial regression, regularized linear regression, decision trees, random forest regression, and many others. But, you can always start with the simple machine learning methods first.
Classification Method in Machine Learning
This is another class of supervised ML. Classification method explains or forecasts a class value. For instance, this method can assist to predict whether an online customer will purchase a particular product or not. The output can be a buyer or not buyer: yes or no.
The classification method isn’t restricted to these classes. This method can help to evaluate whether a specified image contains a truck or a car. The output will be three dissimilar values: 1) the image includes a truck, 2) the image includes a car, or 3) the image doesn’t contain either a car or a truck.
If you are wondering the simplest machine learning methods here, logistic regression is the one. It may sound like a regression technique, but it is not. Logistic regression guesses the probability of an occurrence of an occasion regarding one or more inputs. It can be used in a variety of applications as well.
For example, a logic regression can receive inputs in the form of two exam scores for a student. This data is then used to estimate the probability whether the student can be admitted to a certain college or not. Since it is utilized to estimate a probability, the output is either 0 or 1.
Clustering Method in Machine Learning
Clustering method is a category under unsupervised ML. Their objective is to collect or cluster observations which have similar characteristics. This method doesn’t employ output information for training. Instead, it lets the algorithm determine the output. Here, we can only utilize visualization to monitor the solution quality.
The most popular machine learning methods in this category is K-Means. The “K” here implies the number of clusters we create. But, you should note that various techniques are available to select the K value. You can use the elbow method and some other techniques.
Generally, K-Means can randomly select K centers within the data, allocate each data point to the nearest created centers, and re-compute each cluster’s center. Then, if the centers don’t alter, the process is done. But, the process can return to step two if the centers persist to modify.
Aside from K-Means, there are some other techniques available in the clustering method. As you explore it further, you will find many helpful algorithms like Mean Shift Clustering, Density-Based Spatial Clustering of Applications with Noise, Agglomerative Hierarchical Clustering, Expectation-Maximization Clustering with Mixture Models, and many others.
Dimensionality Reduction Method in Machine Learning
This is another one of machine learning methods to learn. As the name suggests, this method employs dimensionality reduction to get rid of the least significant information from a data collection. In practice, there can be data collections with hundreds or even thousands of columns. Thus, minimizing the total number is crucial.
For example, images can contain thousands of pixels, not all of them matter to the analysis. Then, when analyzing microchips within the manufacturing process, we may encounter thousands of measurements and tests applied to each chip. At this point, you will call for dimensionality reduction algorithms to make it manageable.
The most popular machine learning methods in this category is Principal Component Analysis. This method diminishes the dimension of the feature space by discovering new vectors which improve the data linear variation. It can minimize the data noticeably and without losing too much information when the linear associations of the data are powerful.
In conclusion, each machine learning method has its own characteristic and function. Since this field is growing rapidly, there are lots of methods available. If you are just a novice data scientist, you can start with something simple like the machine learning methods mentioned above.