What is DataLoader in PyTorch?

In PyTorch, DataLoader is a tool used for loading and batching data. It encapsulates a dataset (such as Tensor data) into an iterable object, making it convenient to batch and load data when training neural networks. DataLoader can specify parameters such as batch size, whether to shuffle data randomly, and whether to use multithreading, to improve data loading efficiency and training speed. Typically, when training neural networks, DataLoader is used to load training and test datasets, and iterate through the training dataset in each epoch.