Add DreamCoder abstraction typing (converter + compute_type_abs) - #375
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Add DreamCoder abstraction typing (converter + compute_type_abs)#375kavigupta wants to merge 1 commit into
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Introduce `abstraction_production_from_dreamcoder`, which converts a DreamCoder/Stitch invented-primitive string (e.g. `#(lambda (gt? 1 (sum $0)))`) into a NeuroSym `AbstractionProduction`, and `DSL.compute_type_abs`, which infers its type. An abstraction parameter is a stitch metavariable `#k`. compute_type_abs types it wherever it appears -- including as the body of an inner lambda, where the parent production is a lambda (`LambdaTypeSignature`), not a function -- by giving it a fresh type variable resolved by unification, and keys it in the environment at a depth-adjusted slot so it survives lambda-unwinding. Parameters are collected into the abstraction's argument list in application order (`#0` first). Abstractions the list DSL cannot represent yet (e.g. a curried callback passed to `mapi`, which wants an uncurried multi-argument arrow) are skipped (return None), not crashed. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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PR 1 of 4 in a stack that adds typed DreamCoder-abstraction support to the NeuroSym DSL. Merges into
main; the rest stack on this one.What
abstraction_production_from_dreamcoder(dsl, name, s)— convert a DreamCoder/Stitch invented-primitive string (e.g.#(lambda (gt? 1 (sum $0)))) into a NeuroSymAbstractionProduction.DSL.compute_type_abs— infer an abstraction's type.Why it's non-trivial
An abstraction parameter is a stitch metavariable
#k. It has to be typed wherever it appears — including as the body of an inner lambda, where the parent production is aLambdaTypeSignature, not a function. A naive implementation asserts there. Here each#kgets a fresh type variable resolved by unification, keyed in the environment at a depth-adjusted slot so it survives lambda-unwinding, and parameters are collected in application order (#0first).Abstractions the list DSL can't represent yet (e.g. a curried callback to
mapi, which wants an uncurried multi-argument arrow) are skipped (return None), not crashed — later PRs in the stack make more of them representable.Reproducing test
tests/s_exp/dreamcoder_abstractions_test.py::TestAbstractionParameterTyping#(lambda (lambda (gt? $1 (sum $0))))→(i, [i]) -> b(correct argument order)🤖 Generated with Claude Code