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// RUN: %target-run-simple-swift
// REQUIRES: executable_test
import DifferentiationUnittest
import StdlibUnittest
var DerivativeCustomizationTests = TestSuite("DerivativeCustomization")
DerivativeCustomizationTests.testWithLeakChecking("withDerivative") {
do {
var counter = 0
func callback(_ x: inout Tracked<Float>) { counter += 1 }
_ = gradient(at: 4) { (x: Tracked<Float>) -> Tracked<Float> in
// Non-active value should not be differentiated, so `callback` should
// not be called.
_ = x.withDerivative(callback)
return x.withDerivative(callback) + x.withDerivative(callback)
}
expectEqual(2, counter)
}
expectEqual(
30,
gradient(at: 4) { (x: Tracked<Float>) in
x.withDerivative { $0 = 10 } + x.withDerivative { $0 = 20 }
})
}
DerivativeCustomizationTests.testWithLeakChecking("withoutDerivative") {
expectEqual(
0,
gradient(at: Tracked<Float>(4)) { x -> Tracked<Float> in
withoutDerivative(at: x) { x in
x * x * x
}
})
expectEqual(
0,
gradient(at: Tracked<Float>(4)) { x -> Tracked<Float> in
let y = withoutDerivative(at: x)
return y * y * y
})
expectEqual(
2,
gradient(at: Tracked<Float>(4)) { x -> Tracked<Float> in
let y = withoutDerivative(at: x)
return x + y * y * y + x
})
}
runAllTests()
|
