# Can decision trees be used for performing clustering?

Last Update: May 30, 2022

This is a question our experts keep getting from time to time. Now, we have got the complete detailed explanation and answer for everyone, who is interested!

**Asked by: Mr. Oda Rodriguez**

Score: 5/5 (56 votes)

**Decision trees can also be used to perform clustering**, with a few adjustments. On one hand, new split criteria must be discovered to construct the tree without the knowledge of samples la- bels. On the other hand, new algorithms must be applied to merge sub- clusters at leaf nodes into actual clusters.

## Can decision trees be used for performing clustering a true b false?

Q3. Can decision trees be used for performing clustering? Decision trees can **also be used to for clusters in the data** but clustering often generates natural clusters and is not dependent on any objective function.

## Can decision trees be used for performing classification tasks?

Decision Tree is a display of an algorithm. ... Decision Trees can be **used for Classification Tasks**.

## How would you design a clustering algorithm using decision trees?

**Specifically, we can:**

- First, cluster the unlabelled data with K-Means, Agglomerative Clustering or DBSCAN.
- Then, we can choose the number of clusters K to use.
- We assign the label to each sample, making it a supervised learning task.
- We train a Decision Tree model.

## How is cluster different from decision tree?

Decision trees are a method for classifying subjects into known groups. They're a form of supervised learning. The clustering algorithms can be further classified into “**eager learners**,” as they first build a classification model on the training data set and then actually classify the test dataset.

## StatQuest: Decision Trees

**30 related questions found**

### How do you explain clustering results?

The clustering results, together with the temporal relations of the shots, are **used to build the scene transition graph**. Each node represents a collection of shots while an edge reflects the flow of story from one node to the next.

### When can we use decision trees?

Decision trees are used **for handling non-linear data sets effectively**. The decision tree tool is used in real life in many areas, such as engineering, civil planning, law, and business. Decision trees can be divided into two types; categorical variable and continuous variable decision trees.

### Is decision tree supervised or unsupervised?

Decision Trees (DTs) are a **supervised learning** technique that predict values of responses by learning decision rules derived from features. They can be used in both a regression and a classification context. For this reason they are sometimes also referred to as Classification And Regression Trees (CART).

### Which clustering technique requires a merging approach?

Which of the following clustering requires merging approach? Explanation: **Hierarchical clustering** requires a defined distance as well.

### Can random forest be used for clustering?

Random forests are **powerful** not only in classification/regression but also for purposes such as outlier detection, clustering, and interpreting a data set (e.g., serving as a rule engine with inTrees). However, mistakes can be easily made when using random forests.

### Which of the following is disadvantage of decision trees?

Apart from overfitting, Decision Trees also suffer from following disadvantages: 1. **Tree structure prone to sampling** – While Decision Trees are generally robust to outliers, due to their tendency to overfit, they are prone to sampling errors.

### How will you counter Overfitting in the decision tree?

**There are several approaches to avoiding overfitting in building decision trees.**

- Pre-pruning that stop growing the tree earlier, before it perfectly classifies the training set.
- Post-pruning that allows the tree to perfectly classify the training set, and then post prune the tree.

### What types of problems are best suited for decision tree learning?

**Decision tree learning is generally best suited to problems with the following characteristics:**

- Instances are represented by attribute-value pairs. ...
- The target function has discrete output values. ...
- Disjunctive descriptions may be required. ...
- The training data may contain errors.

### Which of the following is a goal of clustering?

The goal of clustering is **to reduce the amount of data by categorizing or grouping similar data items together**.

### How can you prevent a clustering algorithm from getting stuck?

How can you prevent a clustering algorithm from getting stuck in bad local optima? C.K-Means clustering algorithm has the drawback of converging at local minima which can be prevented by **using multiple radom initializations**.

### Which is not a type of clustering?

option3: **K - nearest neighbor method** is used for regression & classification but not for clustering. option4: Agglomerative method uses the bottom-up approach in which each cluster can further divide into sub-clusters i.e. it builds a hierarchy of clusters.

### How many types of clusters are there?

Clustering itself can be categorized into **two types** viz. Hard Clustering and Soft Clustering.

### Which is needed by K-means clustering?

K-means clustering is one of the simplest and popular unsupervised machine learning algorithms. ... In other words, the K-means algorithm identifies **k number of centroids**, and then allocates every data point to the nearest cluster, while keeping the centroids as small as possible.

### What is difference between K-means and K Medoids?

K-means **attempts to minimize the total squared error**, while k-medoids minimizes the sum of dissimilarities between points labeled to be in a cluster and a point designated as the center of that cluster. In contrast to the k -means algorithm, k -medoids chooses datapoints as centers ( medoids or exemplars).

### Is K nearest neighbor supervised or unsupervised?

The k-nearest neighbors (KNN) algorithm is a simple, **supervised** machine learning algorithm that can be used to solve both classification and regression problems.

### Is Apriori supervised or unsupervised?

Apriori is generally considered an **unsupervised learning approach**, since it's often used to discover or mine for interesting patterns and relationships. Apriori can also be modified to do classification based on labelled data.

### Can decision tree be unsupervised?

The concept of unsupervised decision trees is **only slightly misleading** since it is the combination of an unsupervised clustering algorithm that creates the first guess about what's good and what's bad on which the decision tree then splits. Step 1: Run a clustering algorithm on your data.

### Which is better decision tree or random forest?

But the random forest chooses features randomly during the training process. Therefore, it does not depend highly on any specific set of features. ... Therefore, the random forest can generalize over the data in a better way. This randomized feature selection makes **random forest** much more accurate than a decision tree.

### What is the final objective of decision tree?

As the goal of a decision tree is that **it makes the optimal choice at the end of each node it needs an algorithm that is capable of doing just that**. That algorithm is known as Hunt's algorithm, which is both greedy, and recursive.

### What is difference between decision tree and random forest?

A decision tree combines some decisions, whereas **a random forest combines several decision trees**. Thus, it is a long process, yet slow. Whereas, a decision tree is fast and operates easily on large data sets, especially the linear one. The random forest model needs rigorous training.