torch.compile & Kernel Fusion

A runtime that already knows the sequence it is about to run has nothing left to decide. The eager execution overhead lesson closed on that property and priced its absence: several hundred separately arranged operations inside a decode step whose whole budget is a few milliseconds. PyTorch's route from deciding to knowing is one function, torch.compile, introduced in PyTorch 2.x…

In this lesson

• The recorded program
• The generated kernel
• A decode step through the compiler
• The engine's default path
• Seeing what compiled

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