Contents

- 1 Is there bias variance in unsupervised learning?
- 2 Is there a target variable In unsupervised learning?
- 3 How do you differentiate between supervised and unsupervised learning?
- 4 Is unsupervised learning less accurate?
- 5 How do you balance bias and variance?
- 6 Is the bias-variance tradeoff a problem in supervised learning?
- 7 Why are bias and variance important in machine learning?
- 8 When do you need high bias and low variance?
- 9 When does a supervised learning model underfit?

## Is there bias variance in unsupervised learning?

Unsupervised learning is a flavor of machine learning in which we do not have a set of data with answers to train on. The goal of any supervised machine learning algorithm is to achieve low bias and low variance.

## Is there a target variable In unsupervised learning?

Unsupervised learning, where there is no target or outcome variable, is more technically challenging than supervised learning and requires more input from subject-matter experts.

## How do you differentiate between supervised and unsupervised learning?

Supervised learning model predicts the output. Unsupervised learning model finds the hidden patterns in data. In supervised learning, input data is provided to the model along with the output. In unsupervised learning, only input data is provided to the model.

## Is unsupervised learning less accurate?

Disadvantages of Unsupervised Learning There is no way of obtaining the way or method the data is sorted as the dataset is unlabelled. They may be less accurate as the input data is not known and labelled by the humans making the machine do it.

## How do you balance bias and variance?

How to maintain a balance of Bias and Variance? Increasing the bias can decrease the variance whereas increasing the variance can decrease the bias.

## Is the bias-variance tradeoff a problem in supervised learning?

The bias-variance tradeoff is a central problem in supervised learning. Ideally, one wants to choose a model that both accurately captures the regularities in its training data, but also generalizes well to unseen data. Unfortunately, it is typically impossible to do both simultaneously.

## Why are bias and variance important in machine learning?

An optimized model will be sensitive to the patterns in our data, but at the same time will be able to generalize to new data. In this, both the bias and variance should be low so as to prevent overfitting and underfitting. Figure 6: Error in Training and Testing with high Bias and Variance

## When do you need high bias and low variance?

If our model is too simple and has very few parameters then it may have high bias and low variance. On the other hand if our model has large number of parameters then it’s going to have high variance and low bias. So we need to find the right/good balance without overfitting and underfitting the data.

## When does a supervised learning model underfit?

In supervised learning, underfitting happens when a model unable to capture the underlying pattern of the data. These models usually have high bias and low variance. It happens when we have very less amount of data to build an accurate model or when we try to build a linear model with a nonlinear data.