Why does Saturn Cloud put experimental code on their blog?

I have been studying neural networks, but have gone beyond writing code using Python’s machine learning library, sklearn, and its deep learning library, Keras Tensorflow. I am endeavouring to learn how to write a neural network from scratch using the information that is being made available to me using Google Search and ChatGPT.

I have used the blog, Saturn Cloud, on a few occasions. I would like to point out that on a few occasions this blog has also given incorrect code. I was a bit miffed about this, but was able to find the answers that I was seeking on other reputable websites, such as stackoverflow.

I am writing this post because I have been spending the last few days studying code to enable me to make a neural network that will accept a dataset from scratch. During my quest I found a blog post on another where a person posted his code of a neural network and suggested that if people find any mistakes then to please email him. To be clear, I would not knowingly write a blog post that had bad code and on a few occasions I have actually corrected code when I had received complaints about my code.

Today I came across a Saturn Cloud post about neural networks and the code below references np.sigmoid. I got an error message saying that numpy does not have any sigmoid function:-