scirs2-spatial 0.4.2

Spatial algorithms module for SciRS2 (scirs2-spatial)
Documentation 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301

//! SIMD distance metrics integration tests
//!
//! This module tests the SIMD-accelerated distance implementations
//! in scirs2-spatial, ensuring correctness and performance.

use scirs2_spatial::distance::{chebyshev, euclidean, manhattan};

#[test]
fn test_simd_euclidean_f64_basic() {
    let point1 = &[1.0f64, 2.0, 3.0];
    let point2 = &[4.0f64, 5.0, 6.0];

    let dist = euclidean(point1, point2);

    // Expected: sqrt((4-1)^2 + (5-2)^2 + (6-3)^2) = sqrt(9+9+9) = sqrt(27) ≈ 5.196
    let expected = 27.0f64.sqrt();
    assert!(
        (dist - expected).abs() < 1e-10,
        "Got {}, expected {}",
        dist,
        expected
    );
}

#[test]
fn test_simd_euclidean_f32_basic() {
    let point1 = &[1.0f32, 2.0, 3.0];
    let point2 = &[4.0f32, 5.0, 6.0];

    let dist = euclidean(point1, point2);

    let expected = 27.0f32.sqrt();
    assert!(
        (dist - expected).abs() < 1e-6,
        "Got {}, expected {}",
        dist,
        expected
    );
}

#[test]
fn test_simd_euclidean_f64_large() {
    // Test with large array to ensure SIMD path is used
    let point1: Vec<f64> = (0..1000).map(|i| i as f64).collect();
    let point2: Vec<f64> = (0..1000).map(|i| (i + 1) as f64).collect();

    let dist = euclidean(&point1, &point2);

    // Each dimension differs by 1, so euclidean distance = sqrt(1000 * 1^2) = sqrt(1000)
    let expected = 1000.0f64.sqrt();
    assert!(
        (dist - expected).abs() < 1e-10,
        "Got {}, expected {}",
        dist,
        expected
    );
}

#[test]
fn test_simd_euclidean_f32_large() {
    let point1: Vec<f32> = (0..1000).map(|i| i as f32).collect();
    let point2: Vec<f32> = (0..1000).map(|i| (i + 1) as f32).collect();

    let dist = euclidean(&point1, &point2);

    let expected = 1000.0f32.sqrt();
    assert!(
        (dist - expected).abs() < 1e-4,
        "Got {}, expected {}",
        dist,
        expected
    );
}

#[test]
fn test_simd_manhattan_f64_basic() {
    let point1 = &[1.0f64, 2.0, 3.0];
    let point2 = &[4.0f64, 5.0, 6.0];

    let dist = manhattan(point1, point2);

    // Expected: |4-1| + |5-2| + |6-3| = 3 + 3 + 3 = 9
    let expected = 9.0f64;
    assert!(
        (dist - expected).abs() < 1e-10,
        "Got {}, expected {}",
        dist,
        expected
    );
}

#[test]
fn test_simd_manhattan_f32_basic() {
    let point1 = &[1.0f32, 2.0, 3.0];
    let point2 = &[4.0f32, 5.0, 6.0];

    let dist = manhattan(point1, point2);

    let expected = 9.0f32;
    assert!(
        (dist - expected).abs() < 1e-6,
        "Got {}, expected {}",
        dist,
        expected
    );
}

#[test]
fn test_simd_manhattan_f64_large() {
    // Test with large array
    let point1: Vec<f64> = (0..1000).map(|i| i as f64).collect();
    let point2: Vec<f64> = (0..1000).map(|i| (i + 1) as f64).collect();

    let dist = manhattan(&point1, &point2);

    // Each dimension differs by 1, so manhattan distance = 1000 * 1 = 1000
    let expected = 1000.0f64;
    assert!(
        (dist - expected).abs() < 1e-10,
        "Got {}, expected {}",
        dist,
        expected
    );
}

#[test]
fn test_simd_manhattan_f32_large() {
    let point1: Vec<f32> = (0..1000).map(|i| i as f32).collect();
    let point2: Vec<f32> = (0..1000).map(|i| (i + 1) as f32).collect();

    let dist = manhattan(&point1, &point2);

    let expected = 1000.0f32;
    assert!(
        (dist - expected).abs() < 1e-4,
        "Got {}, expected {}",
        dist,
        expected
    );
}

#[test]
fn test_simd_chebyshev_f64_basic() {
    let point1 = &[1.0f64, 2.0, 3.0];
    let point2 = &[4.0f64, 5.0, 6.0];

    let dist = chebyshev(point1, point2);

    // Expected: max(|4-1|, |5-2|, |6-3|) = max(3, 3, 3) = 3
    let expected = 3.0f64;
    assert!(
        (dist - expected).abs() < 1e-10,
        "Got {}, expected {}",
        dist,
        expected
    );
}

#[test]
fn test_simd_chebyshev_f32_basic() {
    let point1 = &[1.0f32, 2.0, 3.0];
    let point2 = &[4.0f32, 5.0, 6.0];

    let dist = chebyshev(point1, point2);

    let expected = 3.0f32;
    assert!(
        (dist - expected).abs() < 1e-6,
        "Got {}, expected {}",
        dist,
        expected
    );
}

#[test]
fn test_simd_chebyshev_f64_large() {
    // Test with large array where one dimension has max difference
    let point1: Vec<f64> = (0..1000)
        .map(|i| if i == 500 { 0.0 } else { i as f64 })
        .collect();
    let point2: Vec<f64> = (0..1000)
        .map(|i| if i == 500 { 100.0 } else { i as f64 })
        .collect();

    let dist = chebyshev(&point1, &point2);

    // Max difference is at index 500: |100 - 0| = 100
    let expected = 100.0f64;
    assert!(
        (dist - expected).abs() < 1e-10,
        "Got {}, expected {}",
        dist,
        expected
    );
}

#[test]
fn test_simd_chebyshev_f32_large() {
    let point1: Vec<f32> = (0..1000)
        .map(|i| if i == 500 { 0.0 } else { i as f32 })
        .collect();
    let point2: Vec<f32> = (0..1000)
        .map(|i| if i == 500 { 100.0 } else { i as f32 })
        .collect();

    let dist = chebyshev(&point1, &point2);

    let expected = 100.0f32;
    assert!(
        (dist - expected).abs() < 1e-4,
        "Got {}, expected {}",
        dist,
        expected
    );
}

#[test]
fn test_simd_euclidean_negative_values() {
    let point1 = &[-1.0f64, -2.0, -3.0];
    let point2 = &[1.0f64, 2.0, 3.0];

    let dist = euclidean(point1, point2);

    // Expected: sqrt((1-(-1))^2 + (2-(-2))^2 + (3-(-3))^2) = sqrt(4+16+36) = sqrt(56)
    let expected = 56.0f64.sqrt();
    assert!((dist - expected).abs() < 1e-10);
}

#[test]
fn test_simd_manhattan_negative_values() {
    let point1 = &[-1.0f64, -2.0, -3.0];
    let point2 = &[1.0f64, 2.0, 3.0];

    let dist = manhattan(point1, point2);

    // Expected: |1-(-1)| + |2-(-2)| + |3-(-3)| = 2 + 4 + 6 = 12
    let expected = 12.0f64;
    assert!((dist - expected).abs() < 1e-10);
}

#[test]
fn test_simd_euclidean_zero_distance() {
    let point1 = &[1.0f64, 2.0, 3.0];
    let point2 = &[1.0f64, 2.0, 3.0];

    let dist = euclidean(point1, point2);

    assert!(
        dist.abs() < 1e-10,
        "Distance between identical points should be 0"
    );
}

#[test]
fn test_simd_manhattan_zero_distance() {
    let point1 = &[1.0f64, 2.0, 3.0];
    let point2 = &[1.0f64, 2.0, 3.0];

    let dist = manhattan(point1, point2);

    assert!(
        dist.abs() < 1e-10,
        "Distance between identical points should be 0"
    );
}

#[test]
fn test_simd_chebyshev_zero_distance() {
    let point1 = &[1.0f64, 2.0, 3.0];
    let point2 = &[1.0f64, 2.0, 3.0];

    let dist = chebyshev(point1, point2);

    assert!(
        dist.abs() < 1e-10,
        "Distance between identical points should be 0"
    );
}

#[test]
fn test_simd_euclidean_single_dimension() {
    let point1 = &[5.0f64];
    let point2 = &[8.0f64];

    let dist = euclidean(point1, point2);

    let expected = 3.0f64;
    assert!((dist - expected).abs() < 1e-10);
}

#[test]
fn test_simd_euclidean_two_dimensions() {
    let point1 = &[3.0f64, 4.0];
    let point2 = &[0.0f64, 0.0];

    let dist = euclidean(point1, point2);

    // Expected: sqrt(3^2 + 4^2) = sqrt(9 + 16) = sqrt(25) = 5
    let expected = 5.0f64;
    assert!((dist - expected).abs() < 1e-10);
}