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// Copyright ©2019 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 f32_test
import (
"testing"
. "gonum.org/v1/gonum/internal/asm/f32"
)
func TestL2NormUnitary(t *testing.T) {
const tol = 1e-7
var src_gd float32 = 1
for j, v := range []struct {
want float32
x []float32
}{
{want: 0, x: []float32{}},
{want: 2, x: []float32{2}},
{want: 3.7416573867739413, x: []float32{1, 2, 3}},
{want: 3.7416573867739413, x: []float32{-1, -2, -3}},
{want: nan, x: []float32{nan}},
{want: 17.88854381999832, x: []float32{8, -8, 8, -8, 8}},
{want: 2.23606797749979, x: []float32{0, 1, 0, -1, 0, 1, 0, -1, 0, 1}},
} {
g_ln := 4 + j%2
v.x = guardVector(v.x, src_gd, g_ln)
src := v.x[g_ln : len(v.x)-g_ln]
ret := L2NormUnitary(src)
if !sameApprox(ret, v.want, tol) {
t.Errorf("Test %d L2Norm error Got: %f Expected: %f", j, ret, v.want)
}
if !isValidGuard(v.x, src_gd, g_ln) {
t.Errorf("Test %d Guard violated in src vector %v %v", j, v.x[:g_ln], v.x[len(v.x)-g_ln:])
}
}
}
func TestL2NormInc(t *testing.T) {
const tol = 1e-7
var src_gd float32 = 1
for j, v := range []struct {
inc int
want float32
x []float32
}{
{inc: 2, want: 0, x: []float32{}},
{inc: 3, want: 2, x: []float32{2}},
{inc: 10, want: 3.7416573867739413, x: []float32{1, 2, 3}},
{inc: 5, want: 3.7416573867739413, x: []float32{-1, -2, -3}},
{inc: 3, want: nan, x: []float32{nan}},
{inc: 15, want: 17.88854381999832, x: []float32{8, -8, 8, -8, 8}},
{inc: 1, want: 2.23606797749979, x: []float32{0, 1, 0, -1, 0, 1, 0, -1, 0, 1}},
} {
g_ln, ln := 4+j%2, len(v.x)
v.x = guardIncVector(v.x, src_gd, v.inc, g_ln)
src := v.x[g_ln : len(v.x)-g_ln]
ret := L2NormInc(src, uintptr(ln), uintptr(v.inc))
if !sameApprox(ret, v.want, tol) {
t.Errorf("Test %d L2NormInc error Got: %f Expected: %f", j, ret, v.want)
}
checkValidIncGuard(t, v.x, src_gd, v.inc, g_ln)
}
}
func TestL2DistanceUnitary(t *testing.T) {
const tol = 1e-7
var src_gd float32 = 1
for j, v := range []struct {
want float32
x, y []float32
}{
{want: 0, x: []float32{}, y: []float32{}},
{want: 2, x: []float32{3}, y: []float32{1}},
{want: 3.7416573867739413, x: []float32{2, 4, 6}, y: []float32{1, 2, 3}},
{want: 3.7416573867739413, x: []float32{1, 2, 3}, y: []float32{2, 4, 6}},
{want: nan, x: []float32{nan}, y: []float32{0}},
{want: 17.88854381999832, x: []float32{9, -9, 9, -9, 9}, y: []float32{1, -1, 1, -1, 1}},
{want: 2.23606797749979, x: []float32{0, 1, 0, -1, 0, 1, 0, -1, 0, 1}, y: []float32{0, 2, 0, -2, 0, 2, 0, -2, 0, 2}},
} {
g_ln := 4 + j%2
v.x = guardVector(v.x, src_gd, g_ln)
v.y = guardVector(v.y, src_gd, g_ln)
srcX := v.x[g_ln : len(v.x)-g_ln]
srcY := v.y[g_ln : len(v.y)-g_ln]
ret := L2DistanceUnitary(srcX, srcY)
if !sameApprox(ret, v.want, tol) {
t.Errorf("Test %d L2Distance error Got: %f Expected: %f", j, ret, v.want)
}
if !isValidGuard(v.x, src_gd, g_ln) {
t.Errorf("Test %d Guard violated in src vector %v %v", j, v.x[:g_ln], v.x[len(v.x)-g_ln:])
}
}
}
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