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rand: simplify rand.PRNG, move to optional types for error handling (#13570)

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This commit is contained in:
Subhomoy Haldar
2022-02-23 16:06:14 +05:30
committed by GitHub
parent 5c0b7b0d05
commit 114a341f5f
49 changed files with 609 additions and 1586 deletions
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89
vlib/rand/pcg32/pcg32_test.v
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@ -17,10 +17,10 @@ const (
fn gen_randoms(seed_data []u32, bound int) []u32 {
mut randoms := []u32{len: 20}
mut rng := pcg32.PCG32RNG{}
mut rng := &rand.PRNG(&pcg32.PCG32RNG{})
rng.seed(seed_data)
for i in 0 .. 20 {
randoms[i] = rng.u32n(u32(bound))
randoms[i] = rng.u32n(u32(bound)) or { panic("Couldn't obtain u32") }
}
return randoms
}
@ -38,40 +38,29 @@ fn test_pcg32_reproducibility() {
}
}
// TODO: use the `in` syntax and remove this function
// after generics has been completely implemented
fn found(value u64, arr []u64) bool {
for item in arr {
if value == item {
return true
}
}
return false
}
fn test_pcg32_variability() {
// If this test fails and if it is certainly not the implementation
// at fault, try changing the seed values. Repeated values are
// improbable but not impossible.
for seed in seeds {
mut rng := pcg32.PCG32RNG{}
mut rng := &rand.PRNG(&pcg32.PCG32RNG{})
rng.seed(seed)
mut values := []u64{cap: value_count}
for i in 0 .. value_count {
value := rng.u64()
assert !found(value, values)
assert value !in values
assert values.len == i
values << value
}
}
}
fn check_uniformity_u64(mut rng pcg32.PCG32RNG, range u64) {
fn check_uniformity_u64(mut rng rand.PRNG, range u64) {
range_f64 := f64(range)
expected_mean := range_f64 / 2.0
mut variance := 0.0
for _ in 0 .. sample_size {
diff := f64(rng.u64n(range)) - expected_mean
diff := f64(rng.u64n(range) or { panic("Couldn't obtain u64") }) - expected_mean
variance += diff * diff
}
variance /= sample_size - 1
@ -84,7 +73,7 @@ fn check_uniformity_u64(mut rng pcg32.PCG32RNG, range u64) {
fn test_pcg32_uniformity_u64() {
ranges := [14019545, 80240, 130]
for seed in seeds {
mut rng := pcg32.PCG32RNG{}
mut rng := &rand.PRNG(&pcg32.PCG32RNG{})
rng.seed(seed)
for range in ranges {
check_uniformity_u64(mut rng, u64(range))
@ -92,7 +81,7 @@ fn test_pcg32_uniformity_u64() {
}
}
fn check_uniformity_f64(mut rng pcg32.PCG32RNG) {
fn check_uniformity_f64(mut rng rand.PRNG) {
expected_mean := 0.5
mut variance := 0.0
for _ in 0 .. sample_size {
@ -109,7 +98,7 @@ fn check_uniformity_f64(mut rng pcg32.PCG32RNG) {
fn test_pcg32_uniformity_f64() {
// The f64 version
for seed in seeds {
mut rng := pcg32.PCG32RNG{}
mut rng := &rand.PRNG(&pcg32.PCG32RNG{})
rng.seed(seed)
check_uniformity_f64(mut rng)
}
@ -118,10 +107,10 @@ fn test_pcg32_uniformity_f64() {
fn test_pcg32_u32n() {
max := u32(16384)
for seed in seeds {
mut rng := pcg32.PCG32RNG{}
mut rng := &rand.PRNG(&pcg32.PCG32RNG{})
rng.seed(seed)
for _ in 0 .. range_limit {
value := rng.u32n(max)
value := rng.u32n(max) or { panic("Couldn't obtain u32") }
assert value >= 0
assert value < max
}
@ -131,10 +120,10 @@ fn test_pcg32_u32n() {
fn test_pcg32_u64n() {
max := u64(379091181005)
for seed in seeds {
mut rng := pcg32.PCG32RNG{}
mut rng := &rand.PRNG(&pcg32.PCG32RNG{})
rng.seed(seed)
for _ in 0 .. range_limit {
value := rng.u64n(max)
value := rng.u64n(max) or { panic("Couldn't obtain u64") }
assert value >= 0
assert value < max
}
@ -145,10 +134,12 @@ fn test_pcg32_u32_in_range() {
max := u32(484468466)
min := u32(316846)
for seed in seeds {
mut rng := pcg32.PCG32RNG{}
mut rng := &rand.PRNG(&pcg32.PCG32RNG{})
rng.seed(seed)
for _ in 0 .. range_limit {
value := rng.u32_in_range(u32(min), u32(max))
value := rng.u32_in_range(u32(min), u32(max)) or {
panic("Couldn't obtain u32 in range")
}
assert value >= min
assert value < max
}
@ -159,10 +150,10 @@ fn test_pcg32_u64_in_range() {
max := u64(216468454685163)
min := u64(6848646868)
for seed in seeds {
mut rng := pcg32.PCG32RNG{}
mut rng := &rand.PRNG(&pcg32.PCG32RNG{})
rng.seed(seed)
for _ in 0 .. range_limit {
value := rng.u64_in_range(min, max)
value := rng.u64_in_range(min, max) or { panic("Couldn't obtain u64 in range") }
assert value >= min
assert value < max
}
@ -173,7 +164,7 @@ fn test_pcg32_int31() {
max_u31 := int(0x7FFFFFFF)
sign_mask := int(0x80000000)
for seed in seeds {
mut rng := pcg32.PCG32RNG{}
mut rng := &rand.PRNG(&pcg32.PCG32RNG{})
rng.seed(seed)
for _ in 0 .. range_limit {
value := rng.int31()
@ -189,7 +180,7 @@ fn test_pcg32_int63() {
max_u63 := i64(0x7FFFFFFFFFFFFFFF)
sign_mask := i64(0x8000000000000000)
for seed in seeds {
mut rng := pcg32.PCG32RNG{}
mut rng := &rand.PRNG(&pcg32.PCG32RNG{})
rng.seed(seed)
for _ in 0 .. range_limit {
value := rng.int63()
@ -203,10 +194,10 @@ fn test_pcg32_int63() {
fn test_pcg32_intn() {
max := 2525642
for seed in seeds {
mut rng := pcg32.PCG32RNG{}
mut rng := &rand.PRNG(&pcg32.PCG32RNG{})
rng.seed(seed)
for _ in 0 .. range_limit {
value := rng.intn(max)
value := rng.intn(max) or { panic("Couldn't obtain int") }
assert value >= 0
assert value < max
}
@ -216,10 +207,10 @@ fn test_pcg32_intn() {
fn test_pcg32_i64n() {
max := i64(3246727724653636)
for seed in seeds {
mut rng := pcg32.PCG32RNG{}
mut rng := &rand.PRNG(&pcg32.PCG32RNG{})
rng.seed(seed)
for _ in 0 .. range_limit {
value := rng.i64n(max)
value := rng.i64n(max) or { panic("Couldn't obtain i64") }
assert value >= 0
assert value < max
}
@ -230,10 +221,10 @@ fn test_pcg32_int_in_range() {
min := -4252
max := 1034
for seed in seeds {
mut rng := pcg32.PCG32RNG{}
mut rng := &rand.PRNG(&pcg32.PCG32RNG{})
rng.seed(seed)
for _ in 0 .. range_limit {
value := rng.int_in_range(min, max)
value := rng.int_in_range(min, max) or { panic("Couldn't obtain int in range") }
assert value >= min
assert value < max
}
@ -244,10 +235,10 @@ fn test_pcg32_i64_in_range() {
min := i64(-24095)
max := i64(324058)
for seed in seeds {
mut rng := pcg32.PCG32RNG{}
mut rng := &rand.PRNG(&pcg32.PCG32RNG{})
rng.seed(seed)
for _ in 0 .. range_limit {
value := rng.i64_in_range(min, max)
value := rng.i64_in_range(min, max) or { panic("Couldn't obtain i64 in range") }
assert value >= min
assert value < max
}
@ -256,7 +247,7 @@ fn test_pcg32_i64_in_range() {
fn test_pcg32_f32() {
for seed in seeds {
mut rng := pcg32.PCG32RNG{}
mut rng := &rand.PRNG(&pcg32.PCG32RNG{})
rng.seed(seed)
for _ in 0 .. range_limit {
value := rng.f32()
@ -268,7 +259,7 @@ fn test_pcg32_f32() {
fn test_pcg32_f64() {
for seed in seeds {
mut rng := pcg32.PCG32RNG{}
mut rng := &rand.PRNG(&pcg32.PCG32RNG{})
rng.seed(seed)
for _ in 0 .. range_limit {
value := rng.f64()
@ -281,10 +272,10 @@ fn test_pcg32_f64() {
fn test_pcg32_f32n() {
max := f32(357.0)
for seed in seeds {
mut rng := pcg32.PCG32RNG{}
mut rng := &rand.PRNG(&pcg32.PCG32RNG{})
rng.seed(seed)
for _ in 0 .. range_limit {
value := rng.f32n(max)
value := rng.f32n(max) or { panic("Couldn't obtain f32") }
assert value >= 0.0
assert value < max
}
@ -294,10 +285,10 @@ fn test_pcg32_f32n() {
fn test_pcg32_f64n() {
max := 1.52e6
for seed in seeds {
mut rng := pcg32.PCG32RNG{}
mut rng := &rand.PRNG(&pcg32.PCG32RNG{})
rng.seed(seed)
for _ in 0 .. range_limit {
value := rng.f64n(max)
value := rng.f64n(max) or { panic("Couldn't obtain f64") }
assert value >= 0.0
assert value < max
}
@ -308,10 +299,10 @@ fn test_pcg32_f32_in_range() {
min := f32(-24.0)
max := f32(125.0)
for seed in seeds {
mut rng := pcg32.PCG32RNG{}
mut rng := &rand.PRNG(&pcg32.PCG32RNG{})
rng.seed(seed)
for _ in 0 .. range_limit {
value := rng.f32_in_range(min, max)
value := rng.f32_in_range(min, max) or { panic("Couldn't obtain f32 in range") }
assert value >= min
assert value < max
}
@ -322,10 +313,10 @@ fn test_pcg32_f64_in_range() {
min := -548.7
max := 5015.2
for seed in seeds {
mut rng := pcg32.PCG32RNG{}
mut rng := &rand.PRNG(&pcg32.PCG32RNG{})
rng.seed(seed)
for _ in 0 .. range_limit {
value := rng.f64_in_range(min, max)
value := rng.f64_in_range(min, max) or { panic("Couldn't obtain f64 in range") }
assert value >= min
assert value < max
}
@ -333,5 +324,5 @@ fn test_pcg32_f64_in_range() {
}
fn test_change_default_random_generator() {
rand.set_rng(pcg32.PCG32RNG{})
rand.set_rng(&rand.PRNG(&pcg32.PCG32RNG{}))
}