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Update swift-rl to compile with modern S4TF toolchains. #6

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Update swift-rl to compile with modern S4TF toolchains. #6

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33 changes: 4 additions & 29 deletions Sources/ReinforcementLearning/Utilities/Protocols.swift
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Original file line number Diff line number Diff line change
Expand Up @@ -304,35 +304,9 @@ extension KeyPathIterable {
extension KeyPathIterable where Self: Differentiable, Self.TangentVector: KeyPathIterable {
// TODO: Differentiable `stack` and `unstacked`.

@differentiable(wrt: self, vjp: _vjpFlattenedBatch)
public func flattenedBatch(outerDimCount: Int) -> Self {
var result = self
for kp in result.recursivelyAllWritableKeyPaths(to: Tensor<Float>.self) {
result[keyPath: kp] = result[keyPath: kp].flattenedBatch(outerDimCount: outerDimCount)
}
for kp in result.recursivelyAllWritableKeyPaths(to: Tensor<Double>.self) {
result[keyPath: kp] = result[keyPath: kp].flattenedBatch(outerDimCount: outerDimCount)
}
return result
}

@differentiable(wrt: self, vjp: _vjpUnflattenedBatch)
public func unflattenedBatch(outerDims: [Int]) -> Self {
var result = self
for kp in result.recursivelyAllWritableKeyPaths(to: Tensor<Float>.self) {
result[keyPath: kp] = result[keyPath: kp].unflattenedBatch(outerDims: outerDims)
}
for kp in result.recursivelyAllWritableKeyPaths(to: Tensor<Double>.self) {
result[keyPath: kp] = result[keyPath: kp].unflattenedBatch(outerDims: outerDims)
}
return result
}
}

internal extension KeyPathIterable
where Self: Differentiable, Self.TangentVector: KeyPathIterable {
@derivative(of: flattenedBatch(outerDimCount:), wrt: self)
@usableFromInline
func _vjpFlattenedBatch(outerDimCount: Int) -> (Self, (TangentVector) -> TangentVector) {
func _vjpFlattenedBatch(outerDimCount: Int) -> (value: Self, pullback: (TangentVector) -> TangentVector) {
// TODO: This is very hacky.
var outerDims = [Int]()
for kp in recursivelyAllWritableKeyPaths(to: Tensor<Float>.self) {
Expand All @@ -352,8 +326,9 @@ where Self: Differentiable, Self.TangentVector: KeyPathIterable {
})
}

@derivative(of: unflattenedBatch(outerDims:), wrt: self)
@usableFromInline
func _vjpUnflattenedBatch(outerDims: [Int]) -> (Self, (TangentVector) -> TangentVector) {
func _vjpUnflattenedBatch(outerDims: [Int]) -> (value: Self, pullback: (TangentVector) -> TangentVector) {
let result = unflattenedBatch(outerDims: outerDims)
return (result, { seed in
var result = seed
Expand Down