If you’ve worked with Spark SQL, you might have come across the concept of User Defined Functions (UDFs). As the name suggests, it’s a feature where you define a function, pretty straight forward. But how is this different from any other custom function that you write? Read more...
A couple of days back, we saw how we can connect Apache Spark to an Apache HBase database and query the data from a table using a catalog. Today, we’ll see how we can connect Apache Spark to a MongoDB database and get data directly into Spark from there. Read more...
There will be times when you’ll need the data in your HBase database to be brought into Apache Spark for processing. Usually, you’ll query the database, get the data in whatever format you fancy, and then load that into Spark, maybe using the `parallelize()`function. Read more...
Multicollinearity is a term we often come across when we’re working with multiple regression models. Even we have talked about it in our previous posts, but do we know what it actually means? Today, we’ll try to understand that. Read more...
In most of our posts about machine learning, we’ve talked about overfitting and underfitting. But most of us don’t yet know what those two terms mean. What does it acutally mean when a model is overfit, or underfit? Why are they considered not good? Read more...
Now that we know what is feature selection and how to do it, let’s move our focus to validating the efficiency of our model. This is known as validation or cross validation, depending on what kind of validation method you’re using. Read more...
In our previous post, we discussed what is feature selection and why we need feature selection. In this post, we’re going to look at the different methods used in feature selection. There are three main classification of feature selection methods – Filter Methods, Wrapper Methods, and Embedded Methods. Read more...
If you’ve come across a dataset in your machine learning endeavors which has more than one feature, you’d have also heard of a concept called Feature Selection. Today, we’re going to find out what it is and why we need it. Read more...
Today we’ll be looking at a simple Linear Regression example in Python, and as always, we’ll be using the SciKit Learn library. If you haven’t yet looked into my posts about data pre-processing, which is required before you can fit a model, checkout how you can encode your data to make sure it doesn’t contain any text, and then how you can handle missing data in your dataset. Read more...
When you’re working with a learning model, it is important to scale the features to a range which is centered around zero. This is done so that the variance of the features are in the same range. If a feature’s variance is orders of magnitude more than the variance of other features, that particular feature might dominate other features in the dataset, which is not something we want happening in our model. Read more...