Time-Series in Polars: rolling() Window Functions
We’ve learned how to group time by month (using group_by_dynamic), but what about calculating a “7-day moving average”? This is where Polars rolling functions can…
AI Project: How to Translate Text with Hugging Face
You’ve used Hugging Face to understand text, generate it, and even transcribe audio. Now, let’s use it to break the language barrier with Hugging Face…
How to Fix: ValueError: substring not found
This is a common ValueError that happens when you are searching for a piece of text (a “substring”) inside a string, and it doesn’t exist….
How to Apply Custom Functions in Polars (.map_elements())
You’ve mastered the fast Polars Expression API. But what if you need to run a complex Python function that Polars doesn’t have?, so it’s Polars…
AI Project: Fill-in-the-Blank with Hugging Face (BERT)
This is one of the original tasks that made models like BERT famous. A “Masked Language Model” (MLM) is trained by having words randomly “masked”…
How to Fix: AttributeError: ‘NoneType’ object has no attribute ‘append’
This AttributeError NoneType append is a classic combination of two common problems: a NoneType error and a List method error. It means: You are trying…
Reshaping Data in Polars: The pivot() Method (Long to Wide)
In data analysis, you’re constantly reshaping data. we used melt() to turn “wide” data into “long” data. Today, we’re doing the opposite. pivot() is the…
AI Project: How to Edit Images with AI (Inpainting with diffusers)
We’ve used Stable Diffusion to create images. Now, let’s use it to edit them. In this guide, we’ll explore Hugging Face Inpainting and how it…
How to Fix: TypeError: ‘float’ object is not callable
This error is a direct cousin to TypeError: ‘int’ object is not callable. The TypeError float not callable message means: “You are trying to use…
Polars Performance: String Caching (Categorical Type)
Let’s say you have a 10GB file with a “Country” column. The string “United States of America” might appear 50 million times, using a massive…
