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Limitations

ProgramGrad v0.1 alpha is intentionally narrow.

  • It is scalar-only and pure Python.
  • It does not replace PyTorch, JAX, TensorFlow, Enzyme, or compiler AD.
  • It does not support arbitrary Python syntax or automatic AST rewriting.
  • Hard branches do not become truly differentiable. ProgramGrad exposes surrogate gradients and their bias risks instead.
  • Bounded loop support is a controlled relaxation, not a universal treatment of data-dependent loops.
  • The SVG exporter is a lightweight trace view intended for examples and tests, not a full browser inspector.

This narrow scope is deliberate. The project is a trace laboratory for decision-level differentiable programming, especially branches, thresholds, argmax choices, and small reasoning/search programs.