Production Bugs

(docker, nvidia-ctk) error while loading shared libraries: libcuda.so.1: cannot open shared object file: No such file or directory

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Summary The issue at hand is the failure to load shared libraries, specifically libcuda.so.1, when running a Docker container with the NVIDIA Container Toolkit (nvidia-ctk) on a remote server with Redhat 9.1. The container is set up to use an NVIDIA A100 GPU and is based on the nvidia/cuda:13.1.0-devel-ubuntu24.04 image. Despite setting environment variables such … Read more

Stepwise Random Forest Classifier – Hack or Bodge

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Summary The author describes a stepwise hierarchical classification strategy to handle a highly imbalanced multiclass problem with 81 species. The approach involves training sequential Random Forest models, where each model predicts one species (or genus) versus “the rest,” and feeds its predictions and probabilities as new features into subsequent models. From a production ML engineering … Read more

Family graph using d3.js

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Summary A d3.js family tree visualization failed to properly position family members when rendering multiple generations. The implementation attempted to left-align sons and right-align daughters sequentially but incorrectly estimated subtree heights, causing overlapping families and misaligned connections. This occurred due to a recursive layout with fixed Y-axis increments. Root Cause Fixed vertical spacing ignored dynamic … Read more

Difference between include and require in PHP

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Summary In PHP applications, particularly in WordPress environments, the distinction between include and require centers on how they handle missing files. require is fatal on failure, terminating execution immediately, while include issues a warning and continues execution. This difference dictates architectural safety, particularly when loading optional components or handling conditional file paths. Root Cause The … Read more

Implementing remember-me/stay logged in logic in a Java Servlet

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Summary The implementation of remember-me functionality in a Java Servlet-based system is a complex task that requires careful consideration of session management, cookie handling, and database interactions. In this article, we will discuss the common pitfalls and challenges faced by developers when implementing this functionality, and provide guidance on how to overcome them. Root Cause … Read more

If Aryabhata is credited with inventing zero, how were calculations done before zero existed?

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Summary The concept of zero has been a crucial development in mathematics, and its introduction is often credited to Aryabhata. However, ancient civilizations such as the Babylonians, Greeks, Egyptians, and Romans were able to perform sophisticated mathematical calculations without a symbol for zero. This raises questions about how these civilizations represented the idea of nothing … Read more

How to configure WolverineFx in a background worker project

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Summary The Wolverine.WolverineHasNotStartedException is a common issue encountered when configuring Wolverine in a.NET background worker project. This exception occurs when the IHost has not been started before attempting to use the Wolverine message bus. In this article, we will explore the root cause, real-world impact, and provide a solution to this problem. Root Cause The … Read more

Azure AI Foundry Chat Playground gives better results than API for same prompt (gpt-4o-mini)?

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Summary We investigated a reported discrepancy where Azure AI Foundry’s Chat Playground produced superior and more consistent prompt classifications for gpt-4o-mini compared to identical prompts executed via the direct API or LangChain clients. The root cause was confirmed to be hidden system instructions injected by the Playground interface to enforce structured outputs and specific role … Read more