X

Download Random Forest PowerPoint Presentation

SlidesFinder-Advertising-Design.jpg

Login   OR  Register
X


Iframe embed code :



Presentation url :

Home / General & Others / General & Others Presentations / Random Forest PowerPoint Presentation

Random Forest PowerPoint Presentation

Ppt Presentation Embed Code   Zoom Ppt Presentation

PowerPoint is the world's most popular presentation software which can let you create professional Random Forest powerpoint presentation easily and in no time. This helps you give your presentation on Random Forest in a conference, a school lecture, a business proposal, in a webinar and business and professional representations.

The uploader spent his/her valuable time to create this Random Forest powerpoint presentation slides, to share his/her useful content with the world. This ppt presentation uploaded by worldwideweb in General & Others ppt presentation category is available for free download,and can be used according to your industries like finance, marketing, education, health and many more.

About This Presentation

Slide 1 - Predrag Radenković 3237/10 Faculty of Electrical Engineering University Of Belgrade Random Forest
Slide 2 - Definition Random forest (or random forests) is an ensemble classifier that consists of many decision trees and outputs the class that is the mode of the class's output by individual trees. The term came from random decision forests that was first proposed by Tin Kam Ho of Bell Labs in 1995. The method combines Breiman's "bagging" idea and the random selection of features. 2/14 Predrag Radenković 3237/10
Slide 3 - Decision trees Decision trees are individual learners that are combined. They are one of the most popular learning methods commonly used for data exploration. One type of decision tree is called CART… classification and regression tree. CART … greedy, top-down binary, recursive partitioning, that divides feature space into sets of disjoint rectangular regions. Regions should be pure wrt response variable Simple model is fit in each region – majority vote for classification, constant value for regression. 3/14 Predrag Radenković 3237/10
Slide 4 - Decision tress involve greedy, recursive partitioning. Simple dataset with two predictors Greedy, recursive partitioning along TI and PE 4/14 Predrag Radenković 3237/10
Slide 5 - Algorithm Each tree is constructed using the following algorithm: Let the number of training cases be N, and the number of variables in the classifier be M. We are told the number m of input variables to be used to determine the decision at a node of the tree; m should be much less than M. Choose a training set for this tree by choosing n times with replacement from all N available training cases (i.e. take a bootstrap sample). Use the rest of the cases to estimate the error of the tree, by predicting their classes. For each node of the tree, randomly choose m variables on which to base the decision at that node. Calculate the best split based on these m variables in the training set. Each tree is fully grown and not pruned (as may be done in constructing a normal tree classifier). For prediction a new sample is pushed down the tree. It is assigned the label of the training sample in the terminal node it ends up in. This procedure is iterated over all trees in the ensemble, and the average vote of all trees is reported as random forest prediction. 5/14 Predrag Radenković 3237/10
Slide 6 - Algorithm flow chart For computer scientists: 6/14 Predrag Radenković 3237/10
Slide 7 - Random Forest – practical consideration Splits are chosen according to a purity measure: E.g. squared error (regression), Gini index or devinace (classification) How to select N? Build trees until the error no longer decreases How to select M? Try to recommend defaults, half of them and twice of them and pick the best. 7/14 Predrag Radenković 3237/10
Slide 8 - Features and Advantages The advantages of random forest are: It is one of the most accurate learning algorithms available. For many data sets, it produces a highly accurate classifier. It runs efficiently on large databases. It can handle thousands of input variables without variable deletion. It gives estimates of what variables are important in the classification. It generates an internal unbiased estimate of the generalization error as the forest building progresses. It has an effective method for estimating missing data and maintains accuracy when a large proportion of the data are missing. 8/14 Predrag Radenković 3237/10
Slide 9 - Features and Advantages It has methods for balancing error in class population unbalanced data sets. Generated forests can be saved for future use on other data. Prototypes are computed that give information about the relation between the variables and the classification. It computes proximities between pairs of cases that can be used in clustering, locating outliers, or (by scaling) give interesting views of the data. The capabilities of the above can be extended to unlabeled data, leading to unsupervised clustering, data views and outlier detection. It offers an experimental method for detecting variable interactions. 9/14 Predrag Radenković 3237/10
Slide 10 - Disadvantages Random forests have been observed to overfit for some datasets with noisy classification/regression tasks. For data including categorical variables with different number of levels, random forests are biased in favor of those attributes with more levels. Therefore, the variable importance scores from random forest are not reliable for this type of data. 10/14 Predrag Radenković 3237/10
Slide 11 - RM - Additional information Estimating the test error: While growing forest, estimate test error from training samples For each tree grown, 33-36% of samples are not selected in bootstrap, called out of bootstrap (OOB) samples Using OOB samples as input to the corresponding tree, predictions are made as if they were novel test samples Through book-keeping, majority vote (classification), average (regression) is computed for all OOB samples from all trees. Such estimated test error is very accurate in practice, with reasonable N 11/14 Predrag Radenković 3237/10
Slide 12 - RM - Additional information Estimating the importance of each predictor: Denote by ê the OOB estimate of the loss when using original training set, D. For each predictor xp where p∈{1,..,k} Randomly permute pth predictor to generate a new set of samples D' ={(y1,x'1),…,(yN,x'N)} Compute OOB estimate êk of prediction error with the new samples A measure of importance of predictor xp is êk – ê, the increase in error due to random perturbation of pth predictor 12/14 Predrag Radenković 3237/10
Slide 13 - Conclusions & summary: Fast fast fast! RF is fast to build. Even faster to predict! Practically speaking, not requiring cross-validation alone for model selection significantly speeds training by 10x-100x or more. Fully parallelizable … to go even faster! Automatic predictor selection from large number of candidates Resistance to over training Ability to handle data without preprocessing data does not need to be rescaled, transformed, or modified resistant to outliers automatic handling of missing values Cluster identification can be used to generate tree-based clusters through sample proximity 13/14 Predrag Radenković 3237/10
Slide 14 - Thank you! 14/14 Predrag Radenković 3237/10
 

Frequently Asked Questions

> About SlidesFinder?

Slidesfinder is a website that allows users to upload and share their PowerPoint presentations online. It provides a platform for individuals and businesses to share their ideas and knowledge through presentations, and for others to view and download these presentations for educational or professional purposes.
Slidesfinder offers a wide range of presentation topics and categories, including business, education, science, technology, health, and more. Users can also search for presentations using keywords, tags, or by category. The website provides tools to create professional presentations with rich media, animations, and graphics.



One of the key features of Slidesfinder is its user-friendly interface, which allows users to easily upload, view, and share presentations. Users can also embed their presentations in their websites or blogs using the website's embed code feature.
Slidesfinder also offers premium services, such as the ability to create private presentations and to download presentations in high-quality formats. However, the basic features of Slidesfinder are free to use, making it accessible to anyone who wants to share their ideas and knowledge through presentations.

> How do I register with SlidesFinder?

Go to registration page (you can see signup link on top of website page) https://www.slidesfinder.com/signup . If you have facebook/gmail account them just click on SIGN IN WITH FACEBOOK OR SIGN IN WITH GOOGLE button, by this you will be a registered member of slidesfinder without filling any form, required detail automatically will be fatch from your account. If you do not a Facebook account, then click on "Signup". Fill all required fields and you will be a registered member of slidesfinder.

> Is slidesfinder account confirmation is mandatory?

Yes it is mandetory to active your account to login.

> Do I need to signup/login on SlidesFinder before uploading a PowerPoint presentation?

Yes, you need to login with your account before uploading presentation. Your username will be displayed on your uploaded presentation. Your registered email id is needed for sending your stats of uploaded presentation.

Slidesfinder is a sharing website for PowerPoint presentations search and share. Find your interest in the form of powerpoint presentations on slidesfinder and save your valuable time . On Slidesfinder you get presentations from our huge library of professional ppt presentations. We believe in making your search INFORMATIVE and FUN. Find your best ppt presentation from a pool of PowerPoint presentations stacked under important industry categories like business & management, heath & Wellness,eduction & training etc. We provide unique informative PowerPoint presentation for marketers, presenters and educationists. These professional PowerPoint presentations are uploaded by professionals from across numerous industry segments.These ppt presentations are available for FREE download.

Not just finding your interest, but facilitate you broadcast your interest. We have created this platform for easy sharing of PowerPoint presentations, ensuring that these presentations get maximum exposure. Create your slidesfinder account and upload PowerPoint presentations for free, share on social media platforms and BUILD YOUR CROWD WITH PRESENTATION !!

The Great Buddha says, "Share your knowledge.It’s a way to achieve immortality"! So, start sharing knowledge and we are here to make that immortal !!

© 2013-2024 SlidesFinder. All rights reserved.

Re-productivity of content are not allowed. Without prior written permission from author, commercial use of any content is illegal.