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TorchDynamo Deep Dive

Introduction to Dynamo Dynamo is a tracer tracer: Records linear(=no branching) sequence of torch ops(Aten) Given some inputs, it returns an FX graph with the PyTorch functions that were executed torch.fx.graph is a container that stores a list of func calls It can also trace integers if it detects that they changed between calls (SymInt) It specializes any other value that is not a tensor or a scalar

Mar 7, 2025 - 13:55
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TorchDynamo Deep Dive

Introduction to Dynamo

  1. Dynamo is a tracer
    • tracer: Records linear(=no branching) sequence of torch ops(Aten)
  2. Given some inputs, it returns an FX graph with the PyTorch functions that were executed
    • torch.fx.graph is a container that stores a list of func calls
  3. It can also trace integers if it detects that they changed between calls (SymInt)
  4. It specializes any other value that is not a tensor or a scalar
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