What is TorchScript and why is it being replaced by torch.compile in modern PyTorch?

TorchScript is a static graph compiler, while torch.compile is a dynamic graph optimizer using modern compilation techniques.

TorchScript requires tracing or scripting Python into a static IR, which limits dynamic behavior. torch.compile uses Dynamo and Inductor to capture and optimize Python execution dynamically, supporting modern PyTorch idioms and better performance.