41 lines
1.3 KiB
Kotlin
41 lines
1.3 KiB
Kotlin
import io.kotest.core.spec.style.DescribeSpec
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import io.kotest.matchers.equals.shouldBeEqual
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import org.openrndr.extra.gradientdescent.gradient
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class TestGradient : DescribeSpec({
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describe("a simple 1d function") {
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fun parabola(x: DoubleArray): Double {
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return x[0] * x[0]
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}
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it("its gradient at x=0 is 0.0") {
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val g0 = gradient(doubleArrayOf(0.0), ::parabola)
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g0.size.shouldBeEqual(1)
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g0[0].shouldBeEqual(0.0)
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}
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it("its gradient at x=1 is ~2.0") {
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val g1 = gradient(doubleArrayOf(1.0), ::parabola)
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}
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it("its gradient at x=-1 is ~-2.0") {
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val g1 = gradient(doubleArrayOf(-1.0), ::parabola)
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}
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}
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describe("a simple 2d function") {
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fun parabola(x: DoubleArray): Double {
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return x[0] * x[0] + x[1] * x[1]
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}
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it("its gradient at x=0 is 0.0") {
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val g0 = gradient(doubleArrayOf(0.0, 0.0), ::parabola)
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g0.size.shouldBeEqual(2)
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g0[0].shouldBeEqual(0.0)
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}
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it("its gradient at x=1 is ~2.0") {
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val g1 = gradient(doubleArrayOf(1.0, 1.0), ::parabola)
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}
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it("its gradient at x=-1 is ~-2.0") {
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val g1 = gradient(doubleArrayOf(-1.0, -1.0), ::parabola)
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}
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}
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}) |