File size: 6,942 Bytes
ad474c9 | 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 | """Tests for content-addressable HDC storage and its file format."""
import os
import random
import sys
import tempfile
import unittest
sys.path.insert(0, os.path.dirname(os.path.dirname(os.path.abspath(__file__))))
from hdc.hypervec import hvc, random_hv, sim # noqa: E402
from hdc.memory import HDCStorage, pack, unpack # noqa: E402
D = 2000
class TestCells(unittest.TestCase):
def test_write_read(self):
s = HDCStorage(d=D)
hv = random_hv(D, random.Random(1))
s.write("a", hv)
self.assertEqual(s.read("a"), hv)
self.assertIn("a", s)
self.assertEqual(len(s), 1)
def test_overwrite_does_not_grow(self):
s = HDCStorage(d=D)
s.write("a", 1)
s.write("a", 2)
self.assertEqual(len(s), 1)
self.assertEqual(s.read("a"), 2)
def test_missing_cell(self):
s = HDCStorage(d=D)
with self.assertRaises(KeyError):
s.read("nope")
self.assertEqual(s.read("nope", default=7), 7)
def test_capacity_overflow(self):
s = HDCStorage(d=200, capacity=2)
s.write("x", 1)
s.write("y", 2)
with self.assertRaises(MemoryError):
s.write("z", 3)
def test_pack_unpack(self):
s = random_hv(D, random.Random(2))
self.assertEqual(unpack(pack(s, D), D), s)
self.assertEqual(len(pack(s, D)), (D + 7) // 8)
class TestCleanup(unittest.TestCase):
def test_nearest_symbol_exact(self):
s = HDCStorage(d=D)
s.write("alpha", 1, symbol=True)
s.write("beta", 2, symbol=True)
self.assertEqual(s.symbols(), ["alpha", "beta"])
hits = s.nearest_symbol(s.addr("beta"), k=1)
self.assertEqual(hits[0][0], "beta")
self.assertEqual(hits[0][1], 1.0)
def test_nearest_symbol_noisy(self):
s = HDCStorage(d=D)
s.write("alpha", 1, symbol=True)
s.write("beta", 2, symbol=True)
probe = s.addr("alpha") ^ (1 << 4) # one bit of the address wrong
name, score = s.nearest_symbol(probe, k=1)[0]
self.assertEqual(name, "alpha")
self.assertLess(score, 1.0)
self.assertGreater(score, 0.9)
def test_prefix_filter(self):
s = HDCStorage(d=D)
s.write("code/0", 1, symbol=True)
s.write("tool/x", 2, symbol=True)
hits = s.nearest_symbol(s.addr("code/0"), k=5, prefix="tool/")
self.assertEqual([h[0] for h in hits], ["tool/x"])
class TestContentAddressing(unittest.TestCase):
def setUp(self):
self.s = HDCStorage(d=D)
self.names = ["r0", "r1", "data/x", "data/y"]
for i, n in enumerate(self.names):
self.s.write(n, random_hv(D, random.Random(100 + i)))
def test_exact_hit_confidence_is_one(self):
name, conf = self.s.resolve(self.s.addr("data/x"))
self.assertEqual(name, "data/x")
self.assertEqual(conf, 1.0)
def test_fuzzy_hit(self):
addr = self.s.addr("data/y")
rng = random.Random(7)
# flip ~0.5% of the bits: a corrupted but still recognisable address
for pos in rng.sample(range(D), 10):
addr ^= 1 << pos
got = self.s.resolve(addr)
self.assertIsNotNone(got)
name, conf = got
self.assertEqual(name, "data/y")
self.assertLess(conf, 1.0)
self.assertGreater(conf, 0.9)
self.assertEqual(self.s.fuzzy_reads, 1)
def test_unrelated_address_returns_none(self):
alien = random_hv(D, random.Random(999))
self.assertIsNone(self.s.resolve(alien))
def test_empty_store_returns_none(self):
self.assertIsNone(HDCStorage(d=D).resolve(random_hv(D, random.Random(3))))
class TestRecall(unittest.TestCase):
def test_sorted_descending_and_self_first(self):
s = HDCStorage(d=D)
vecs = {}
for i in range(6):
vecs["c%d" % i] = random_hv(D, random.Random(200 + i))
s.write("c%d" % i, vecs["c%d" % i])
hits = s.recall(vecs["c3"], k=4)
self.assertEqual(len(hits), 4)
self.assertEqual(hits[0][0], "c3")
self.assertEqual(hits[0][2], 1.0)
sims = [h[2] for h in hits]
self.assertEqual(sims, sorted(sims, reverse=True))
def test_prefix_scopes_search(self):
s = HDCStorage(d=D)
probe = random_hv(D, random.Random(5))
s.write("code/0", probe)
s.write("data/0", random_hv(D, random.Random(6)))
hits = s.recall(probe, k=5, prefix="data/")
self.assertEqual([h[0] for h in hits], ["data/0"])
def test_floor_filters(self):
s = HDCStorage(d=D)
s.write("a", random_hv(D, random.Random(7)))
self.assertEqual(s.recall(random_hv(D, random.Random(8)), k=5, floor=0.5), [])
class TestPersistence(unittest.TestCase):
def test_save_load_roundtrip(self):
s = HDCStorage(d=D, capacity=64, label="unit")
for i in range(5):
s.write("cell%d" % i, random_hv(D, random.Random(300 + i)), symbol=True)
s.write("code/0", 0)
with tempfile.TemporaryDirectory() as tmp:
path = os.path.join(tmp, "unit.hdc")
size = s.save(path)
self.assertGreater(size, 0)
loaded = HDCStorage.load(path)
self.assertEqual(loaded.d, D)
self.assertEqual(dict(loaded.cells), dict(s.cells))
self.assertEqual(loaded.symbols(), s.symbols())
self.assertEqual(loaded.order, s.order)
self.assertEqual(loaded.read("cell3"), s.read("cell3"))
def test_reject_bad_magic(self):
with tempfile.TemporaryDirectory() as tmp:
path = os.path.join(tmp, "junk.hdc")
with open(path, "wb") as fh:
fh.write(b"NOTHDC!!" + b"\x00" * 32)
with self.assertRaises(ValueError):
HDCStorage.load(path)
class TestStat(unittest.TestCase):
def test_keys_and_counts(self):
s = HDCStorage(d=D, capacity=10)
s.write("a", random_hv(D, random.Random(9)), symbol=True)
s.read("a")
st = s.stat()
for key in (
"label",
"d",
"cells_used",
"cells_free",
"occupancy",
"symbols",
"reads",
"writes",
"stored_bits",
"total_popcount",
):
self.assertIn(key, st)
self.assertEqual(st["cells_used"], 1)
self.assertEqual(st["cells_free"], 9)
self.assertEqual(st["writes"], 1)
self.assertEqual(st["reads"], 1)
self.assertEqual(st["stored_bits"], D)
self.assertAlmostEqual(st["occupancy"], 0.1)
def test_clone_is_independent(self):
s = HDCStorage(d=D)
s.write("a", 1, symbol=True)
c = s.clone()
c.write("b", 2)
self.assertIn("a", c)
self.assertNotIn("b", s)
self.assertEqual(s.symbols(), ["a"])
if __name__ == "__main__":
unittest.main()
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