MullOverThing

Useful tips for everyday

# Why is encoder necessary in VAE?

## Why is encoder necessary in VAE?

variational autoencoders (VAEs) are autoencoders that tackle the problem of the latent space irregularity by making the encoder return a distribution over the latent space instead of a single point and by adding in the loss function a regularisation term over that returned distribution in order to ensure a better …

What’s the difference between a variational autoencoder VAE and an autoencoder?

An autoencoder accepts input, compresses it, and then recreates the original input. A variational autoencoder assumes that the source data has some sort of underlying probability distribution (such as Gaussian) and then attempts to find the parameters of the distribution.

### Why do we need variational autoencoder?

The main benefit of a variational autoencoder is that we’re capable of learning smooth latent state representations of the input data. For standard autoencoders, we simply need to learn an encoding which allows us to reproduce the input.

How images can be generated with variational Autoencoders?

Variational autoencoders are trained to learn the probability distribution that models the input-data and not the function that maps the input and the output. It then samples points from this distribution and feed them to the decoder to generate new input data samples.

## What is the most crucial drawback of VAEs?

A major drawback of VAEs is the blurry outputs that they generate. As suggested by Dosovitskiy & Brox, VAE models tend to produce unrealistic, blurry samples. This has to do with how data distributions are recovered and loss functions are calculated in VAEs in which we will discuss further below.

Who invented Autoencoder?

Autoencoders were first introduced in the 1980s by Hinton and the PDP group (Rumelhart et al., 1986) to address the problem of “backpropagation without a teacher”, by using the input data as the teacher.

### What is VAE Gan?

VAE-GAN stands for Variational Autoencoder- Generative Adversarial Network (that is one heck of a name.) Before we get started, I must confess that I am no expert in this subject matter (I don’t have PhD in electrical engineering, just sayin’).

What is conditional variational Autoencoder?

Conditional Variational Autoencoder (CVAE) is an extension of Variational Autoencoder (VAE), a generative model that we have studied in the last post. Whereas VAE essentially models latent variables and data directly, CVAE models lantent variables and data, both conditioned to some random variables.

## Are autoencoders generative or discriminative?

The difference between AEs and VAEs is that VAEs are considered generative models, whereas standard AEs are not.

What is a generative model in machine learning?

Generative modeling is used in unsupervised machine learning as a means to describe phenomena in data, enabling computers to understand the real world. This AI understanding can be used to predict all manner of probabilities on a subject from modeled data.

### Are GANs better than VAE?

Although both VAE and GANs are very exciting approaches to learn the underlying data distribution using unsupervised learning but GANs yield better results as compared to VAE. In VAE, we optimize the lower variational bound whereas in GAN, there is no such assumption. VAE and GAN mainly differ in the way of training.

Which is longer the encoder or decoder in VAE?

So, the encoder and decoder half of traditional autoencoder simply looks symmetrical. On the other hand, we see the encoder part of VAE is slightly longer than its decoder thanks to the presence of mu and sigma layers, where those represent mean and standard deviation vectors respectively.

## How are VAE and AE algorithms the same?

The two algorithms (VAE and AE) are essentially taken from the same idea: mapping original image to latent space (done by encoder) and reconstructing back values in latent space into its original dimension (done by decoder ). However, there is a little difference in the two architectures.

What’s the difference between variational and traditional autoencoder?

Variational Autoencoder (VAE). I bet it doesn’t even take you a second to spot the difference! Lemme explain a bit. So, the encoder and decoder half of traditional autoencoder simply looks symmetrical.