wasi-nn: remove BackendKind, add wrapper structs
#6893
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The wasi-nn crate uses virtual dispatch to handle different kinds of backends and registries. For easier use, these items are now wrapped in their own `Box<dyn ...>` structs.
This change completely removes the `BackendKind` enum, which uniquely listed the kinds of backends that the wasi-nn crate contained. Since we allow many kinds of backends in `WasiNnCtx` which can be implemented even outside the crate, this `BackendKind` enum no longer makes sense. This change uses `GraphEncoding` instead.
alexcrichton
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Aug 24, 2023
eduardomourar
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Sep 6, 2023
…e#6893) * wasi-nn: accept a list of backends instead of a hash map * wasi-nn: refactor with new `Backend` and `Registry` wrappers The wasi-nn crate uses virtual dispatch to handle different kinds of backends and registries. For easier use, these items are now wrapped in their own `Box<dyn ...>` structs. * wasi-nn: completely remove `BackendKind` This change completely removes the `BackendKind` enum, which uniquely listed the kinds of backends that the wasi-nn crate contained. Since we allow many kinds of backends in `WasiNnCtx` which can be implemented even outside the crate, this `BackendKind` enum no longer makes sense. This change uses `GraphEncoding` instead. * nit: move `pub mod backend` with other exports prtest:full * fix: remove broken doc links
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One improvement that came from discussions with @geekbeast is that
BackendKind, the enum used for differentiating between ML implementation, is no longer necessary. Instead, we can use the generatedGraphEncodingtype as the key to map to the right implementation.Also, this PR adopts the
Wrapper(Box<dyn ...>)pattern everywhere, which now includes backends and registries. Since wasi-nn accepts multiple implementations for all of these things, we need a way to virtually dispatch to the right implementation. Previously we used theBox<dyn ...>type explicitly in many places but this change opts to use a wrapper around this, expecting users to create the wrapper viaFromandIntoand internally accessing the implementation viaDerefandDerefMut. The idea is to eliminate some of the "type clutter;" let me know if you agree.