# Reproducibility Stack: Seeds, cuDNN Flags, and Deterministic CUDA — End the 'Works on My Machine' Problem

> Source: https://sukruyusufkaya.com/en/learn/fine-tuning-cookbook/ftc-reproducibility-stack-seeds-cudnn-deterministic
> Updated: 2026-05-14T14:42:49.094Z
> Category: Fine-Tuning Cookbook (Model-by-Model)
> Module: Part 0 — Engineering Foundations
**TLDR:** ML's most expensive time sink: irreproducible results. This lesson: seed management, cuDNN/cuBLAS deterministic flags, ATen non-deterministic op detection, dataloader worker seeding, cost of deterministic scatter/gather — all with practical code and real logs.