Introduction to Hidden Markov Model article provided basic understanding of the Hidden Markov Model. We also went through the introduction of the three main problems of HMM (`Evaluation`

, `Learning`

and `Decoding`

). In this **Understanding Forward and Backward Algorithm in Hidden Markov Model **article we will dive deep into the **Evaluation Problem**. We will go through the mathematical understanding & then will use Python and R to build the algorithms by ourself.

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## Introduction to Hidden Markov Model

Hidden Markov Model is an Unsupervised* Machine Learning Algorithm which is part of the Graphical Models. However Hidden Markov Model (HMM) often trained using supervised learning method in case training data is available. In this introduction to Hidden Markov Model we will learn about the foundational concept, usability, intuition of the algorithmic part and some basic examples. Only little bit of knowledge on probability will be sufficient for anyone to understand this article fully.

## Introduction to Coordinate Descent using Least Squares Regression

Coordinate Descent is another type of optimization algorithm used mainly for ‘strongly convex’ and Lasso Regression function. You are probably aware of Gradient Descent, for solving Least Square Regression. In this Introduction to Coordinate Descent using Least Squares Regression tutorial we will learn more about Coordinate Descent and then use this to solve Least Square Regression.

## How to visualize Gradient Descent using Contour plot in Python

Linear Regression often is the introductory chapter of Machine Leaning and Gradient Descent probably is the first optimization technique anyone learns. Most of the time, the instructor uses a Contour Plot in order to explain the path of the Gradient Descent optimization algorithm. I used to wonder how to create those Contour plot. Today I will try to show how to visualize Gradient Descent using Contour plot in Python.

## How to Automate REST API JSON Schema Validation testing using Postman

In recent years with the advent of cloud and modern UI technology, we have decentralized and distributed the processing power, storages and applications across many geographies. The middleware which connects a user with the backend is nothing but RESTful Services. Hence lightweight REST Services have become ubiquitous across many industries. In this tutorial we will learn How to Automate REST API JSON Schema Validation testing using Postman.

As we have seen in the spider man movie, power comes with responsibilities. So the testing the REST Services has become very critical part of the development workflow/lifecycle.

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