PyTorch

PyTorch is the dominant framework for research and production AI. v2.5 (2025) solidifies torch.compile and introduces FlexAttention.

When to Use

• Research: 99% of new papers (Arxiv) use PyTorch.
• Production: Recommended for almost all new DL projects.
• Performance: torch.compile provides C++ level speed with Python ease.

Core Concepts

torch.compile

Just-in-Time (JIT) compilation of your model. model = torch.compile(model) -> 2x speedup.

Dynamic Graphs (Eager Mode)