Structuring a Machine Learning Project

An ML repository should help a new contributor answer basic questions: where does data come from, how is it transformed, how is the model trained, how are results evaluated, and how can the workflow be rerun? A concise README should state prerequisites, data access, common commands, and known limitations. Avoid making one large notebook the only documentation for a multi-step workflow. Many projects separate reusable application code from exploratory notebooks. A source-code package can hold loading, validation, preprocessing, training, evaluation, and inference logic. Notebooks can call those functions while remaining focused on analysis. Tests can exercise transformations and small end-to-end paths. Configuration files hold parameters that change between runs, while scripts or command-line entry points make the workflow repeatable. Data organization depends on privacy, size, and governance. Some templates distinguish raw, interim, processed, and external data, but these names are conventions, not requirements. Large or sensitive datasets often belong in controlled storage rather than Git. Record data versions, schema expectations, and access instructions. Keep derived artifacts traceable to their source data and processing code. Model files, plots, logs, and reports need an explicit policy. Small reproducibility artifacts may belong with a release; large generated outputs may live in artifact storage. Do not commit secrets, personal data, or opaque model files without considering access and licensing. Use ignore rules for local cache and temporary files, while ensuring important configs and environment definitions remain versioned. Cookiecutter Data Science offers a standardized starting structure, but no single layout fits every team; its documentation marks the v1 template deprecated and recommends v2, illustrating that templates evolve. A small experiment may need only a few folders; a production system may require deployment manifests, CI, monitoring, and data contracts. The project should expose its actual workflow, ownership, and validation path without adding empty directories for appearance.