Your Data Teacher Blog

Recently, I stumbled upon a tool called AssemblyAI, which implements some APIs for speech recognition and analysis. I’ve decided to try it in order to create a small voice diary using Telegram, Python and Notion.

Principal Component Analysis is a very useful dimensionality reduction tool. It can really help you reduce the number of features of a model. Although it may seem a powerful tool for a data scientist, there are some drawbacks that I think make it unsuitable for supervised machine learning projects.

Every time we train a model we should check if its performance beats some baseline, which is a trivial model that doesn’t take the inputs into account. Comparing our model with a baseline model, we can actually figure out whether it actually learns or not.

Dealing with unbalanced datasets is always hard for a data scientist. Such datasets can create trouble for our machine learning models if we don’t deal with them properly. So, measuring how much our dataset is unbalanced is important before taking the proper precautions. In this article, I suggest some possible techniques.

Training a model is a complex process requiring much effort and analysis. Once a model is ready, we know that it won’t be valid forever and that we’ll need to train it again. How can we decide if a model needs to be retrained? There are some techniques that help us.

Data pre-processing is an important part of every machine learning project. A very useful transformation to be applied to data is normalization. Some models require it as mandatory to work properly. Let’s see some of them.

Model explanation is an essential task in supervised machine learning. Explaining how a model can represent the information is crucial to understanding the dynamics that rule our data. Let’s see some models that are easy to interpret.

Online marketing and startup growth are better if you can continuously test different ideas. The statistic comes into help when we have to perform A/B tests. The results you may achieve with the proper analysis can give your project a great boost.

Data scientists usually split a dataset into training and test sets. Their model is trained on the former and then its performance is checked in the latter. But, if these sets are sampled wrongly, model performance may be affected by biases.

Models are very powerful tools to be used in several web applications. The general approach is to make them accessible by using REST APIs. In this article, I’ll talk about a model that can be created in Python and then deployed in pure Javascript.