gonum.org/v1/gonum@v0.14.0/internal/asm/f32/l2norm_test.go (about)

     1  // Copyright ©2019 The Gonum Authors. All rights reserved.
     2  // Use of this source code is governed by a BSD-style
     3  // license that can be found in the LICENSE file.
     4  
     5  package f32_test
     6  
     7  import (
     8  	"testing"
     9  
    10  	. "gonum.org/v1/gonum/internal/asm/f32"
    11  )
    12  
    13  func TestL2NormUnitary(t *testing.T) {
    14  	const tol = 1e-7
    15  
    16  	var src_gd float32 = 1
    17  	for j, v := range []struct {
    18  		want float32
    19  		x    []float32
    20  	}{
    21  		{want: 0, x: []float32{}},
    22  		{want: 2, x: []float32{2}},
    23  		{want: 3.7416573867739413, x: []float32{1, 2, 3}},
    24  		{want: 3.7416573867739413, x: []float32{-1, -2, -3}},
    25  		{want: nan, x: []float32{nan}},
    26  		{want: 17.88854381999832, x: []float32{8, -8, 8, -8, 8}},
    27  		{want: 2.23606797749979, x: []float32{0, 1, 0, -1, 0, 1, 0, -1, 0, 1}},
    28  	} {
    29  		g_ln := 4 + j%2
    30  		v.x = guardVector(v.x, src_gd, g_ln)
    31  		src := v.x[g_ln : len(v.x)-g_ln]
    32  		ret := L2NormUnitary(src)
    33  		if !sameApprox(ret, v.want, tol) {
    34  			t.Errorf("Test %d L2Norm error Got: %f Expected: %f", j, ret, v.want)
    35  		}
    36  		if !isValidGuard(v.x, src_gd, g_ln) {
    37  			t.Errorf("Test %d Guard violated in src vector %v %v", j, v.x[:g_ln], v.x[len(v.x)-g_ln:])
    38  		}
    39  	}
    40  }
    41  
    42  func TestL2NormInc(t *testing.T) {
    43  	const tol = 1e-7
    44  
    45  	var src_gd float32 = 1
    46  	for j, v := range []struct {
    47  		inc  int
    48  		want float32
    49  		x    []float32
    50  	}{
    51  		{inc: 2, want: 0, x: []float32{}},
    52  		{inc: 3, want: 2, x: []float32{2}},
    53  		{inc: 10, want: 3.7416573867739413, x: []float32{1, 2, 3}},
    54  		{inc: 5, want: 3.7416573867739413, x: []float32{-1, -2, -3}},
    55  		{inc: 3, want: nan, x: []float32{nan}},
    56  		{inc: 15, want: 17.88854381999832, x: []float32{8, -8, 8, -8, 8}},
    57  		{inc: 1, want: 2.23606797749979, x: []float32{0, 1, 0, -1, 0, 1, 0, -1, 0, 1}},
    58  	} {
    59  		g_ln, ln := 4+j%2, len(v.x)
    60  		v.x = guardIncVector(v.x, src_gd, v.inc, g_ln)
    61  		src := v.x[g_ln : len(v.x)-g_ln]
    62  		ret := L2NormInc(src, uintptr(ln), uintptr(v.inc))
    63  		if !sameApprox(ret, v.want, tol) {
    64  			t.Errorf("Test %d L2NormInc error Got: %f Expected: %f", j, ret, v.want)
    65  		}
    66  		checkValidIncGuard(t, v.x, src_gd, v.inc, g_ln)
    67  	}
    68  }
    69  
    70  func TestL2DistanceUnitary(t *testing.T) {
    71  	const tol = 1e-7
    72  
    73  	var src_gd float32 = 1
    74  	for j, v := range []struct {
    75  		want float32
    76  		x, y []float32
    77  	}{
    78  		{want: 0, x: []float32{}, y: []float32{}},
    79  		{want: 2, x: []float32{3}, y: []float32{1}},
    80  		{want: 3.7416573867739413, x: []float32{2, 4, 6}, y: []float32{1, 2, 3}},
    81  		{want: 3.7416573867739413, x: []float32{1, 2, 3}, y: []float32{2, 4, 6}},
    82  		{want: nan, x: []float32{nan}, y: []float32{0}},
    83  		{want: 17.88854381999832, x: []float32{9, -9, 9, -9, 9}, y: []float32{1, -1, 1, -1, 1}},
    84  		{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}},
    85  	} {
    86  		g_ln := 4 + j%2
    87  		v.x = guardVector(v.x, src_gd, g_ln)
    88  		v.y = guardVector(v.y, src_gd, g_ln)
    89  		srcX := v.x[g_ln : len(v.x)-g_ln]
    90  		srcY := v.y[g_ln : len(v.y)-g_ln]
    91  		ret := L2DistanceUnitary(srcX, srcY)
    92  		if !sameApprox(ret, v.want, tol) {
    93  			t.Errorf("Test %d L2Distance error Got: %f Expected: %f", j, ret, v.want)
    94  		}
    95  		if !isValidGuard(v.x, src_gd, g_ln) {
    96  			t.Errorf("Test %d Guard violated in src vector %v %v", j, v.x[:g_ln], v.x[len(v.x)-g_ln:])
    97  		}
    98  	}
    99  }