This is a review article discussing deep learning methods broadly; it does not involve a specific empirical sample or dataset, and thus no sample size is applicable.

Review article (Review of methods and developments in deep learning) ([nature.com](https://www.nature.com/articles/nature14539?utm_source=openai)).

No conflicts of interest are declared in the article; the Nature page does not include any COI statement ([doi.org](https://doi.org/10.1038/nature14539)).

The article summarizes the principles and breakthroughs of deep learning, including multilayer neural networks, backpropagation, convolutional and recurrent networks, and their impact on domains such as speech recognition, visual object recognition, object detection, drug discovery, and genomics ([nature.com](https://www.nature.com/articles/nature14539?utm_source=openai)).