In the previous post, I talked about using MapReduce and Spark for distributed model training. In this post, I will talk about parameter server and how it is used in distributed model training. 

In the previous post, I introduced challenges in machine learning systems with big data and complex models. In this post, I will discuss distributed systems in the era of big data. 

Let’s start with linear regression. Using established libraries such as scikit-learn, it is almost trivial to train a linear regression model. We can easily run the model training with a few hundred Megabytes of data on our laptop with a build-in CPU.

Now let’s think big.