{"id":251036,"date":"2023-06-19T12:14:53","date_gmt":"2023-06-19T12:14:53","guid":{"rendered":"https:\/\/imarticus.org\/?p=251036"},"modified":"2024-04-04T09:51:55","modified_gmt":"2024-04-04T09:51:55","slug":"ensemble-methods-combining-multiple-models-for-improved-performance","status":"publish","type":"post","link":"https:\/\/imarticus.org\/blog\/ensemble-methods-combining-multiple-models-for-improved-performance\/","title":{"rendered":"Ensemble Methods: Combining Multiple Models for Improved Performance"},"content":{"rendered":"<p><span style=\"font-weight: 400;\">Machine Learning models developed for more accurate prediction are trained with a variety of different methods. Some of these essential methods are the ensemble methods that can assist in gaining a more accurate result.<\/span><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignright wp-image-241907 size-medium\" src=\"https:\/\/imarticus.org\/blog\/wp-content\/uploads\/2020\/04\/tra-300x174.jpg\" alt=\"data analytics courses\" width=\"300\" height=\"174\" srcset=\"https:\/\/imarticus.org\/blog\/wp-content\/uploads\/2020\/04\/tra-300x174.jpg 300w, https:\/\/imarticus.org\/blog\/wp-content\/uploads\/2020\/04\/tra-768x445.jpg 768w, https:\/\/imarticus.org\/blog\/wp-content\/uploads\/2020\/04\/tra.jpg 1000w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/p>\n<p><span style=\"font-weight: 400;\">In brief, ensemble methods combine the predictions of several methods to form a more accurate result. And anyone who is seeking a<\/span><strong><a href=\"https:\/\/imarticus.org\/postgraduate-program-in-data-science-analytics\/\"> career in data analytics<\/a><\/strong><span style=\"font-weight: 400;\"> should care about it more as it will direct them toward creating models that are more precise.\u00a0<\/span><\/p>\n<h2><strong>What Are Ensemble Methods?<\/strong><\/h2>\n<p><span style=\"font-weight: 400;\">Ensemble methods simply combine several individually trained models through machine learning and statistical techniques with the objective of giving out the most precise result possible. Thus, not only the final result is accurate but also improves the robustness of predictions.\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">By applying this method, one can even reduce the risk of overfitting while increasing the stability of predictions. All of this falls into place by aggregating the output of multiple results. Thus, solving the most complicated machine learning problems, like regression and classification, in no time.\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">In particular fields like finance, healthcare, and autonomous systems where accuracy and reliability are important, the application of ensemble methods can do wonders.<\/span><\/p>\n<h2><strong>Benefits of Ensemble Methods<\/strong><\/h2>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Compared to the other individual models, ensemble methods have increased predictive accuracy.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Given its precision, the result of ensemble methods is less prone to any errors.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">\u00a0It also helps in overcoming the limitations of individual models by combining the strengths of multiple models to achieve better results.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">The ensemble methods perfectly manage both linear and non-linear types of data in the datasheet.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Bias\/Variance can be reduced when using the ensemble method to produce results.\u00a0\u00a0<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Both the process and the end result after the ensemble of models are less noisy and more stable in nature.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Given the use of ensemble methods, it can be applied to various machine learning tasks, such as classification, anomaly detection, and regression.<\/span><\/li>\n<\/ul>\n<h2><strong>Ensemble Method Groups<\/strong><\/h2>\n<p><span style=\"font-weight: 400;\">Ensemble learning methods are mostly categorised into two groups;<\/span><\/p>\n<h3><strong>Sequential Ensemble Methods<\/strong><\/h3>\n<p><span style=\"font-weight: 400;\">As the name implies, in this ensemble method, the base learners are dependent on the results obtained by previous base learners. Although, every subsequent base model corrects the results of its predecessor by fixing the errors in it. Thus, the end result leads to a more improved performance.\u00a0<\/span><\/p>\n<h3><strong>Parallel Ensemble Methods<\/strong><\/h3>\n<p><span style=\"font-weight: 400;\">Contrary to the above one, there is no dependency on base learners in this method. Here, the results of all the models, executed parallelly are combined at the end to make an accurate prediction.\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">There are two Parallel Ensemble Methods with different approaches to their base learner;<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Homogeneous- A single machine learning algorithm is used<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Heterogeneous- Multiple machine learning algorithms are used.<\/span><\/li>\n<\/ul>\n<h2><strong>Types of Ensemble Methods in Machine Learning<\/strong><\/h2>\n<p><span style=\"font-weight: 400;\">In order to have a robust and reliable predictor, ensemble methods have a few advanced techniques to carry out the process. To learn about the process in depth, one can opt for a <\/span><strong><a href=\"https:\/\/imarticus.org\/postgraduate-program-in-data-science-analytics\/\">machine learning certification<\/a><\/strong><span style=\"font-weight: 400;\"> as well.\u00a0<\/span><\/p>\n<p><strong>Here are the three types of ensemble methods that are put to use:<\/strong><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\">\n<h3><strong>Boosting<\/strong><\/h3>\n<\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">It is a sequential ensemble learning technique carried out on the most difficult-to-predict examples. In boosting method, models are iteratively trained so at the end, several weak base learners can also build a powerful ensemble. Here, the final prediction is based on a weighted average of the models. This method is used to decrease bias errors and also can avoid overfitting of data with parameter tuning.<br \/>\n<\/span><span style=\"font-weight: 400;\"><br \/>\n<\/span><span style=\"font-weight: 400;\">Some boosting algorithms are AdaBoost, XGBoost, and LightGBM.<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\">\n<h3><strong>Bagging<\/strong><\/h3>\n<\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">Unlike boosting, in the bagging method, multiple models are trained on a randomly generated sample of the original datasheet. It then combines the predictions from all to aggregate them through averaging or voting. Bagging or Bootstrap Aggregation is a parallel ensemble learning technique to reduce the variance in the final prediction.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">A few examples of it would be Random Forest and Bagged Decision Trees.\u00a0<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\">\n<h3><strong>Stacking<\/strong><\/h3>\n<\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">This method is also known as a stacked generalisation, referring to the ensemble technique that works by combining multiple machine learning algorithms through meta-learning. Here, the base models are trained on the entire datasheet. But the meta-models or level 1 models are trained on the predictions of base-level models. It helps to reduce bias or variance in base models.<br \/>\n<\/span><span style=\"font-weight: 400;\"><br \/>\n<\/span><span style=\"font-weight: 400;\">Some libraries for Stacking are StackingClassifier and StackingRegressor.<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\">\n<h3><strong>Voting<\/strong><\/h3>\n<\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">This ensemble learning method creates multiple models of different types, which go through some simple statistics like calculation mean or median to combine the prediction. This result will then serve as <\/span><span style=\"font-weight: 400;\">additional input for training to make the <\/span><span style=\"font-weight: 400;\">final prediction. Similar to other ensemble methods, it is also implemented through <\/span><span style=\"font-weight: 400;\">Python programming<\/span><span style=\"font-weight: 400;\"> and with the help of tools like Power BI, which makes the process of implementing the models much easier.<\/span><\/p>\n<p><strong>Conclusion<\/strong><\/p>\n<p><span style=\"font-weight: 400;\">A single algorithm might disappoint one by its inaccurate prediction for a given data set. But if we build and combine multiple models, the chance of boosting the accuracy in overall performance increases. This is where ensemble methods are put into use to carry out precise results.\u00a0\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">As we understood from the above information, ensemble methods combine several predictions to churn out the most accurate and robust prediction. However, it is often not preferred in some industries where interpretability is more important. But that being said, no one can deny the effectiveness of these methods. Further, their benefits, if appropriately applied, are tremendous.\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Thus, to learn these ensemble methods, one must <strong><a href=\"https:\/\/imarticus.org\/blog\/the-ultimate-guide-to-learning-python-online\/\">skill up in Python programming and using power BI<\/a><\/strong><\/span><span style=\"font-weight: 400;\">.<\/span><span style=\"font-weight: 400;\"> And all of these can be easily covered in a <\/span><span style=\"font-weight: 400;\">machine learning certification<\/span><span style=\"font-weight: 400;\">.\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">For those who are looking to develop their skills and move ahead in their <\/span><strong><a href=\"https:\/\/imarticus.org\/blog\/a-beginners-guide-to-a-successful-career-in-data-analytics\/\">career in data analytics<\/a><\/strong><span style=\"font-weight: 400;\">, Imarticus Learning offers the <\/span><a href=\"https:\/\/imarticus.org\/postgraduate-program-in-data-science-analytics\/\"><span style=\"font-weight: 400;\">Postgraduate Programme in Data Science and Analytics<\/span><\/a><span style=\"font-weight: 400;\">. Here, you will get the expertise in working with the necessary tools with complete knowledge of the subject.\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Visit Imarticus Learning to <strong><a href=\"https:\/\/imarticus.org\/postgraduate-program-in-data-science-analytics\/\">learn more about data science and machine learning<\/a><\/strong>.<\/span><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Machine Learning models developed for more accurate prediction are trained with a variety of different methods. Some of these essential methods are the ensemble methods that can assist in gaining a more accurate result. In brief, ensemble methods combine the predictions of several methods to form a more accurate result. And anyone who is seeking [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":243048,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_mo_disable_npp":"","_lmt_disableupdate":"no","_lmt_disable":"","footnotes":""},"categories":[23],"tags":[4296,4297,522,833,3229],"class_list":["post-251036","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-analytics","tag-learn-skills-on-python-programming","tag-learn-data-science-and-machine-learning","tag-career-in-data-analytics","tag-machine-learning-certification","tag-best-data-analytics-course"],"acf":[],"aioseo_notices":[],"modified_by":"Imarticus Learning","_links":{"self":[{"href":"https:\/\/imarticus.org\/blog\/wp-json\/wp\/v2\/posts\/251036","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/imarticus.org\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/imarticus.org\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/imarticus.org\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/imarticus.org\/blog\/wp-json\/wp\/v2\/comments?post=251036"}],"version-history":[{"count":3,"href":"https:\/\/imarticus.org\/blog\/wp-json\/wp\/v2\/posts\/251036\/revisions"}],"predecessor-version":[{"id":262720,"href":"https:\/\/imarticus.org\/blog\/wp-json\/wp\/v2\/posts\/251036\/revisions\/262720"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/imarticus.org\/blog\/wp-json\/wp\/v2\/media\/243048"}],"wp:attachment":[{"href":"https:\/\/imarticus.org\/blog\/wp-json\/wp\/v2\/media?parent=251036"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/imarticus.org\/blog\/wp-json\/wp\/v2\/categories?post=251036"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/imarticus.org\/blog\/wp-json\/wp\/v2\/tags?post=251036"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}