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// Copyright ©2017 The Gonum Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package fd
import (
"testing"
"gonum.org/v1/gonum/floats/scalar"
"gonum.org/v1/gonum/mat"
)
func TestLaplacian(t *testing.T) {
t.Parallel()
for cas, test := range hessianTestCases() {
// Modify the test cases where the formula is set.
settings := test.settings
if settings != nil && !settings.Formula.isZero() {
settings.Formula = Forward2nd
}
n := len(test.x)
got := Laplacian(test.h.Func, test.x, test.settings)
hess := mat.NewSymDense(n, nil)
test.h.Hess(hess, test.x)
var want float64
for i := 0; i < n; i++ {
want += hess.At(i, i)
}
if !scalar.EqualWithinAbsOrRel(got, want, test.tol, test.tol) {
t.Errorf("Cas %d: Laplacian mismatch. got %v, want %v", cas, got, want)
}
// Test that concurrency works.
if settings == nil {
settings = &Settings{}
}
settings.Concurrent = true
got2 := Laplacian(test.h.Func, test.x, settings)
if !scalar.EqualWithinAbsOrRel(got, got2, 1e-5, 1e-5) {
t.Errorf("Cas %d: Laplacian mismatch. got %v, want %v", cas, got2, got)
}
}
}
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