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Work on changing StringStore to return hashes.

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This commit is contained in:
Matthew Honnibal 2017-05-28 12:36:27 +02:00
parent 39293ab2ee
commit a5606c3eda
5 changed files with 82 additions and 127 deletions
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8
spacy/strings.pxd
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@ -1,4 +1,5 @@
from libc.stdint cimport int64_t
from libcpp.vector cimport vector
from cymem.cymem cimport Pool
from preshed.maps cimport PreshMap
@ -8,6 +9,9 @@ from .typedefs cimport attr_t, hash_t
cpdef hash_t hash_string(unicode string) except 0
cdef hash_t hash_utf8(char* utf8_string, int length) nogil
cdef unicode decode_Utf8Str(const Utf8Str* string)
ctypedef union Utf8Str:
@ -17,13 +21,11 @@ ctypedef union Utf8Str:
cdef class StringStore:
cdef Pool mem
cdef Utf8Str* c
cdef int64_t size
cdef bint is_frozen
cdef vector[hash_t] keys
cdef public PreshMap _map
cdef public PreshMap _oov
cdef int64_t _resize_at
cdef const Utf8Str* intern_unicode(self, unicode py_string)
cdef const Utf8Str* _intern_utf8(self, char* utf8_string, int length)

149
spacy/strings.pyx
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@ -28,7 +28,7 @@ cdef uint32_t hash32_utf8(char* utf8_string, int length) nogil:
return hash32(utf8_string, length, 1)
cdef unicode _decode(const Utf8Str* string):
cdef unicode decode_Utf8Str(const Utf8Str* string):
cdef int i, length
if string.s[0] < sizeof(string.s) and string.s[0] != 0:
return string.s[1:string.s[0]+1].decode('utf8')
@ -45,10 +45,10 @@ cdef unicode _decode(const Utf8Str* string):
return string.p[i:length + i].decode('utf8')
cdef Utf8Str _allocate(Pool mem, const unsigned char* chars, uint32_t length) except *:
cdef Utf8Str* _allocate(Pool mem, const unsigned char* chars, uint32_t length) except *:
cdef int n_length_bytes
cdef int i
cdef Utf8Str string
cdef Utf8Str* string = <Utf8Str*>mem.alloc(1, sizeof(Utf8Str))
cdef uint32_t ulength = length
if length < sizeof(string.s):
string.s[0] = <unsigned char>length
@ -71,9 +71,9 @@ cdef Utf8Str _allocate(Pool mem, const unsigned char* chars, uint32_t length) ex
assert string.s[0] >= sizeof(string.s) or string.s[0] == 0, string.s[0]
return string
cdef class StringStore:
"""Map strings to and from integer IDs."""
"""Lookup strings by 64-bit hash"""
def __init__(self, strings=None, freeze=False):
"""Create the StringStore.
@ -83,68 +83,56 @@ cdef class StringStore:
self.mem = Pool()
self._map = PreshMap()
self._oov = PreshMap()
self._resize_at = 10000
self.c = <Utf8Str*>self.mem.alloc(self._resize_at, sizeof(Utf8Str))
self.size = 1
self.is_frozen = freeze
if strings is not None:
for string in strings:
_ = self[string]
property size:
def __get__(self):
return self.size -1
def __len__(self):
"""The number of strings in the store.
RETURNS (int): The number of strings in the store.
"""
return self.size-1
self.add(string)
def __getitem__(self, object string_or_id):
"""Retrieve a string from a given integer ID, or vice versa.
"""Retrieve a string from a given hash ID, or vice versa.
string_or_id (bytes or unicode or int): The value to encode.
Returns (unicode or int): The value to be retrieved.
string_or_id (bytes or unicode or uint64): The value to encode.
Returns (unicode or uint64): The value to be retrieved.
"""
if isinstance(string_or_id, basestring) and len(string_or_id) == 0:
return 0
elif string_or_id == 0:
return u''
cdef bytes byte_string
cdef const Utf8Str* utf8str
cdef uint64_t int_id
cdef uint32_t oov_id
if isinstance(string_or_id, (int, long)):
int_id = string_or_id
oov_id = string_or_id
if int_id < <uint64_t>self.size:
return _decode(&self.c[int_id])
else:
utf8str = <Utf8Str*>self._oov.get(oov_id)
if utf8str is not NULL:
return _decode(utf8str)
else:
raise IndexError(string_or_id)
cdef hash_t key
if isinstance(string_or_id, unicode):
key = hash_string(string_or_id)
return key
elif isinstance(string_or_id, bytes):
key = hash_utf8(string_or_id, len(string_or_id))
return key
else:
if isinstance(string_or_id, bytes):
byte_string = <bytes>string_or_id
elif isinstance(string_or_id, unicode):
byte_string = (<unicode>string_or_id).encode('utf8')
else:
raise TypeError(type(string_or_id))
utf8str = self._intern_utf8(byte_string, len(byte_string))
key = string_or_id
utf8str = <Utf8Str*>self._map.get(key)
if utf8str is NULL:
# TODO: We need to use 32 bit here, for compatibility with the
# vocabulary values. This makes birthday paradox probabilities
# pretty bad.
# We could also get unlucky here, and hash into a value that
# collides with the 'real' strings.
return hash32_utf8(byte_string, len(byte_string))
raise KeyError(string_or_id)
else:
return utf8str - self.c
return decode_Utf8Str(utf8str)
def add(self, string):
if isinstance(string, unicode):
key = hash_string(string)
self.intern_unicode(string)
elif isinstance(string, bytes):
key = hash_utf8(string, len(string))
self._intern_utf8(string, len(string))
else:
raise TypeError(
"Can only add unicode or bytes. Got type: %s" % type(string))
return key
def __len__(self):
"""The number of strings in the store.
RETURNS (int): The number of strings in the store.
"""
return self.keys.size()
def __contains__(self, unicode string not None):
"""Check whether a string is in the store.
@ -163,16 +151,15 @@ cdef class StringStore:
YIELDS (unicode): A string in the store.
"""
cdef int i
for i in range(self.size):
yield _decode(&self.c[i]) if i > 0 else u''
cdef hash_t key
for i in range(self.keys.size()):
key = self.keys[i]
utf8str = <Utf8Str*>self._map.get(key)
yield decode_Utf8Str(utf8str)
# TODO: Iterate OOV here?
def __reduce__(self):
strings = [""]
for i in range(1, self.size):
string = &self.c[i]
py_string = _decode(string)
strings.append(py_string)
strings = list(self)
return (StringStore, (strings,), None, None, None)
def to_disk(self, path):
@ -230,11 +217,9 @@ cdef class StringStore:
self.mem = Pool()
self._map = PreshMap()
self._oov = PreshMap()
self._resize_at = 10000
self.c = <Utf8Str*>self.mem.alloc(self._resize_at, sizeof(Utf8Str))
self.size = 1
self.keys.clear()
for string in strings:
_ = self[string]
self.add(string)
self.is_frozen = freeze
cdef const Utf8Str* intern_unicode(self, unicode py_string):
@ -258,39 +243,11 @@ cdef class StringStore:
key32 = hash32_utf8(utf8_string, length)
# Important: Make the OOV store own the memory. That way it's trivial
# to flush them all.
value = <Utf8Str*>self._oov.mem.alloc(1, sizeof(Utf8Str))
value[0] = _allocate(self._oov.mem, <unsigned char*>utf8_string, length)
value = _allocate(self._oov.mem, <unsigned char*>utf8_string, length)
self._oov.set(key32, value)
return NULL
if self.size == self._resize_at:
self._realloc()
self.c[self.size] = _allocate(self.mem, <unsigned char*>utf8_string, length)
self._map.set(key, <void*>&self.c[self.size])
self.size += 1
return &self.c[self.size-1]
def _realloc(self):
# We want to map straight to pointers, but they'll be invalidated if
# we resize our array. So, first we remap to indices, then we resize,
# then we can acquire the new pointers.
cdef Pool tmp_mem = Pool()
keys = <key_t*>tmp_mem.alloc(self.size, sizeof(key_t))
cdef key_t key
cdef void* value
cdef const Utf8Str ptr
cdef int i = 0
cdef size_t offset
while map_iter(self._map.c_map, &i, &key, &value):
# Find array index with pointer arithmetic
offset = ((<Utf8Str*>value) - self.c)
keys[offset] = key
self._resize_at *= 2
cdef size_t new_size = self._resize_at * sizeof(Utf8Str)
self.c = <Utf8Str*>self.mem.realloc(self.c, new_size)
self._map = PreshMap(self.size)
for i in range(self.size):
if keys[i]:
self._map.set(keys[i], &self.c[i])
value = _allocate(self.mem, <unsigned char*>utf8_string, length)
self._map.set(key, value)
self.keys.push_back(key)
return value

44
spacy/tests/stringstore/test_stringstore.py
View File

@ -8,69 +8,65 @@ import pytest
@pytest.mark.parametrize('text1,text2,text3', [(b'Hello', b'goodbye', b'hello')])
def test_stringstore_save_bytes(stringstore, text1, text2, text3):
i = stringstore[text1]
assert i == 1
assert stringstore[text1] == 1
assert stringstore[text2] != i
assert stringstore[text3] != i
assert i == 1
key = stringstore.add(text1)
assert stringstore[text1] == key
assert stringstore[text2] != key
assert stringstore[text3] != key
@pytest.mark.parametrize('text1,text2,text3', [('Hello', 'goodbye', 'hello')])
def test_stringstore_save_unicode(stringstore, text1, text2, text3):
i = stringstore[text1]
assert i == 1
assert stringstore[text1] == 1
assert stringstore[text2] != i
assert stringstore[text3] != i
assert i == 1
key = stringstore.add(text1)
assert stringstore[text1] == key
assert stringstore[text2] != key
assert stringstore[text3] != key
@pytest.mark.parametrize('text', [b'A'])
def test_stringstore_retrieve_id(stringstore, text):
i = stringstore[text]
assert stringstore.size == 1
assert stringstore[1] == text.decode('utf8')
with pytest.raises(IndexError):
key = stringstore.add(text)
assert len(stringstore) == 1
assert stringstore[key] == text.decode('utf8')
with pytest.raises(KeyError):
stringstore[2]
@pytest.mark.parametrize('text1,text2', [(b'0123456789', b'A')])
def test_stringstore_med_string(stringstore, text1, text2):
store = stringstore[text1]
store = stringstore.add(text1)
assert stringstore[store] == text1.decode('utf8')
dummy = stringstore[text2]
dummy = stringstore.add(text2)
assert stringstore[text1] == store
def test_stringstore_long_string(stringstore):
text = "INFORMATIVE](http://www.google.com/search?as_q=RedditMonkey&amp;hl=en&amp;num=50&amp;btnG=Google+Search&amp;as_epq=&amp;as_oq=&amp;as_eq=&amp;lr=&amp;as_ft=i&amp;as_filetype=&amp;as_qdr=all&amp;as_nlo=&amp;as_nhi=&amp;as_occt=any&amp;as_dt=i&amp;as_sitesearch=&amp;as_rights=&amp;safe=off"
store = stringstore[text]
store = stringstore.add(text)
assert stringstore[store] == text
@pytest.mark.parametrize('factor', [254, 255, 256])
def test_stringstore_multiply(stringstore, factor):
text = 'a' * factor
store = stringstore[text]
store = stringstore.add(text)
assert stringstore[store] == text
def test_stringstore_massive_strings(stringstore):
text = 'a' * 511
store = stringstore[text]
store = stringstore.add(text)
assert stringstore[store] == text
text2 = 'z' * 512
store = stringstore[text2]
store = stringstore.add(text2)
assert stringstore[store] == text2
text3 = '1' * 513
store = stringstore[text3]
store = stringstore.add(text3)
assert stringstore[store] == text3
@pytest.mark.parametrize('text', ["qqqqq"])
def test_stringstore_to_bytes(stringstore, text):
store = stringstore[text]
store = stringstore.add(text)
serialized = stringstore.to_bytes()
new_stringstore = StringStore().from_bytes(serialized)
assert new_stringstore[store] == text

2
spacy/typedefs.pxd
View File

@ -4,7 +4,7 @@ from libc.stdint cimport uint8_t
ctypedef uint64_t hash_t
ctypedef char* utf8_t
ctypedef int32_t attr_t
ctypedef uint64_t attr_t
ctypedef uint64_t flags_t
ctypedef uint16_t len_t
ctypedef uint16_t tag_t

6
spacy/vocab.pyx
View File

@ -172,7 +172,7 @@ cdef class Vocab:
for attr, func in self.lex_attr_getters.items():
value = func(string)
if isinstance(value, unicode):
value = self.strings[value]
value = self.strings.add(value)
if attr == PROB:
lex.prob = value
elif value is not None:
@ -227,7 +227,7 @@ cdef class Vocab:
"""
cdef attr_t orth
if type(id_or_string) == unicode:
orth = self.strings[id_or_string]
orth = self.strings.add(id_or_string)
else:
orth = id_or_string
return Lexeme(self, orth)
@ -291,7 +291,7 @@ cdef class Vocab:
with (path / 'vocab' / 'strings.json').open('r', encoding='utf8') as file_:
strings_list = ujson.load(file_)
for string in strings_list:
self.strings[string]
self.strings.add(string)
self.load_lexemes(path / 'lexemes.bin')
def to_bytes(self, **exclude):