## What are the input parameters for the Hidden Markov model?

The parameters of the models are θ=(π1,θh,θo), where π1 is the initial state distribution, θh are the parameters of the hidden model and θo are the parameters of the state-conditional density function p(xt|zt=j,ut).

### How can we learn the values for HMMs parameters a and b given some data?

Learn the values for the HMMs parameters A and B Learning in HMMs involves estimating the state transition probabilities A and the output emission probabilities B that make an observed sequence most likely. Expectation-Maximization algorithms are used for this purpose.

#### What are HMMs used for?

A hidden Markov model (HMM) is a statistical model that can be used to describe the evolution of observable events that depend on internal factors, which are not directly observable. We call the observed event a `symbol’ and the invisible factor underlying the observation a `state’.

**Which method is used to automatically estimate parameters of an HMM?**

The standard HMM estimation algorithm (the Baum-Welch algorithm) was applied to update model parameters after each step of the GA. This approach uses the grammar (probabilistic modelling) of protein secondary structures and transfers it into the stochastic context-free grammar of an HMM.

**Why is model selection used in HMM?**

In the framework of hidden Markov models (HMM), model selection plays a prominent role since it corresponds to the choice of the number of latent states, denoted as m, of the un- observed Markov chain underlying the observed data.

## Which of the following is true about Hidden Markov model?

Explanation: Hidden Markov model is used for solving temporal probabilistic reasoning that was independent of transition and sensor model. Explanation: An HMM is a temporal probabilistic model in which the state of the process is described by a single discrete random variable.

### Where the Hidden Markov model is used?

Hidden Markov models are known for their applications to thermodynamics, statistical mechanics, physics, chemistry, economics, finance, signal processing, information theory, pattern recognition – such as speech, handwriting, gesture recognition, part-of-speech tagging, musical score following, partial discharges and …

#### What is HMM in ML?

A Hidden Markov Model (HMM) is a statistical model which is also used in machine learning. It can be used to describe the evolution of observable events that depend on internal factors, which are not directly observable.

**What are the three basic problems of Hmms?**

HMM provides solution of three problems : evaluation, decoding and learning to find most likelihood classification.