mirror of
https://github.com/explosion/spaCy.git
synced 2024-11-13 05:07:03 +03:00
446a3ecf34
* `strings`: Remove unused `hash32_utf8` function
* `strings`: Make `hash_utf8` and `decode_Utf8Str` private
* `strings`: Reorganize private functions
* 'strings': Raise error when non-string/-int types are passed to functions that don't accept them
* `strings`: Add `items()` method, add type hints, remove unused methods, restrict inputs to specific types, reorganize methods
* `Morphology`: Use `StringStore.items()` to enumerate features when pickling
* `test_stringstore`: Update pre-Python 3 tests
* Update `StringStore` docs
* Fix `get_string_id` imports
* Replace redundant test with tests for type checking
* Rename `_retrieve_interned_str`, remove `.get` default arg
* Add `get_string_id` to `strings.pyi`
Remove `mypy` ignore directives from imports of the above
* `strings.pyi`: Replace functions that consume `Union`-typed params with overloads
* `strings.pyi`: Revert some function signatures
* Update `SYMBOLS_BY_INT` lookups and error codes post-merge
* Revert clobbered change introduced in a previous merge
* Remove unnecessary type hint
* Invert tuple order in `StringStore.items()`
* Add test for `StringStore.items()`
* Revert "`Morphology`: Use `StringStore.items()` to enumerate features when pickling"
This reverts commit 1af9510ceb.
* Rename `keys` and `key_map`
* Add `keys()` and `values()`
* Add comment about the inverted key-value semantics in the API
* Fix type hints
* Implement `keys()`, `values()`, `items()` without generators
* Fix type hints, remove unnecessary boxing
* Update docs
* Simplify `keys/values/items()` impl
* `mypy` fix
* Fix error message, doc fixes
324 lines
11 KiB
Cython
324 lines
11 KiB
Cython
# cython: infer_types=True
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from typing import Optional, Union, Iterable, Tuple, Callable, Any, List, Iterator
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cimport cython
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from libc.string cimport memcpy
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from libcpp.set cimport set
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from libc.stdint cimport uint32_t
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from murmurhash.mrmr cimport hash64
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import srsly
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from .typedefs cimport hash_t
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from .symbols import IDS as SYMBOLS_BY_STR
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from .symbols import NAMES as SYMBOLS_BY_INT
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from .errors import Errors
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from . import util
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cdef class StringStore:
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"""Look up strings by 64-bit hashes. Implicitly handles reserved symbols.
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DOCS: https://spacy.io/api/stringstore
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"""
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def __init__(self, strings: Optional[Iterable[str]] = None):
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"""Create the StringStore.
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strings (iterable): A sequence of unicode strings to add to the store.
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"""
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self.mem = Pool()
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self._map = PreshMap()
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if strings is not None:
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for string in strings:
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self.add(string)
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def __getitem__(self, string_or_hash: Union[str, int]) -> Union[str, int]:
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"""Retrieve a string from a given hash. If a string
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is passed as the input, add it to the store and return
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its hash.
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string_or_hash (int / str): The hash value to lookup or the string to store.
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RETURNS (str / int): The stored string or the hash of the newly added string.
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"""
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if isinstance(string_or_hash, str):
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return self.add(string_or_hash)
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else:
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return self._get_interned_str(string_or_hash)
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def __contains__(self, string_or_hash: Union[str, int]) -> bool:
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"""Check whether a string or a hash is in the store.
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string (str / int): The string/hash to check.
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RETURNS (bool): Whether the store contains the string.
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"""
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cdef hash_t str_hash = get_string_id(string_or_hash)
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if str_hash in SYMBOLS_BY_INT:
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return True
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else:
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return self._map.get(str_hash) is not NULL
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def __iter__(self) -> Iterator[str]:
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"""Iterate over the strings in the store in insertion order.
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RETURNS: An iterable collection of strings.
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"""
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return iter(self.keys())
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def __reduce__(self):
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strings = list(self)
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return (StringStore, (strings,), None, None, None)
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def __len__(self) -> int:
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"""The number of strings in the store.
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RETURNS (int): The number of strings in the store.
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"""
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return self._keys.size()
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def add(self, string: str) -> int:
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"""Add a string to the StringStore.
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string (str): The string to add.
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RETURNS (uint64): The string's hash value.
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"""
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if not isinstance(string, str):
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raise TypeError(Errors.E017.format(value_type=type(string)))
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if string in SYMBOLS_BY_STR:
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return SYMBOLS_BY_STR[string]
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else:
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return self._intern_str(string)
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def as_int(self, string_or_hash: Union[str, int]) -> str:
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"""If a hash value is passed as the input, return it as-is. If the input
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is a string, return its corresponding hash.
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string_or_hash (str / int): The string to hash or a hash value.
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RETURNS (int): The hash of the string or the input hash value.
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"""
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if isinstance(string_or_hash, int):
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return string_or_hash
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else:
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return get_string_id(string_or_hash)
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def as_string(self, string_or_hash: Union[str, int]) -> str:
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"""If a string is passed as the input, return it as-is. If the input
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is a hash value, return its corresponding string.
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string_or_hash (str / int): The hash value to lookup or a string.
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RETURNS (str): The stored string or the input string.
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"""
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if isinstance(string_or_hash, str):
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return string_or_hash
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else:
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return self._get_interned_str(string_or_hash)
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def items(self) -> List[Tuple[str, int]]:
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"""Iterate over the stored strings and their hashes in insertion order.
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RETURNS: A list of string-hash pairs.
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"""
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# Even though we internally store the hashes as keys and the strings as
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# values, we invert the order in the public API to keep it consistent with
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# the implementation of the `__iter__` method (where we wish to iterate over
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# the strings in the store).
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cdef int i
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pairs = [None] * self._keys.size()
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for i in range(self._keys.size()):
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str_hash = self._keys[i]
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utf8str = <Utf8Str*>self._map.get(str_hash)
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pairs[i] = (self._decode_str_repr(utf8str), str_hash)
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return pairs
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def keys(self) -> List[str]:
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"""Iterate over the stored strings in insertion order.
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RETURNS: A list of strings.
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"""
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cdef int i
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strings = [None] * self._keys.size()
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for i in range(self._keys.size()):
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utf8str = <Utf8Str*>self._map.get(self._keys[i])
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strings[i] = self._decode_str_repr(utf8str)
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return strings
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def values(self) -> List[int]:
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"""Iterate over the stored strings hashes in insertion order.
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RETURNS: A list of string hashs.
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"""
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cdef int i
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hashes = [None] * self._keys.size()
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for i in range(self._keys.size()):
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hashes[i] = self._keys[i]
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return hashes
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def to_disk(self, path):
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"""Save the current state to a directory.
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path (str / Path): A path to a directory, which will be created if
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it doesn't exist. Paths may be either strings or Path-like objects.
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"""
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path = util.ensure_path(path)
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strings = sorted(self)
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srsly.write_json(path, strings)
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def from_disk(self, path):
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"""Loads state from a directory. Modifies the object in place and
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returns it.
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path (str / Path): A path to a directory. Paths may be either
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strings or `Path`-like objects.
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RETURNS (StringStore): The modified `StringStore` object.
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"""
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path = util.ensure_path(path)
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strings = srsly.read_json(path)
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prev = list(self)
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self._reset_and_load(strings)
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for word in prev:
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self.add(word)
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return self
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def to_bytes(self, **kwargs):
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"""Serialize the current state to a binary string.
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RETURNS (bytes): The serialized form of the `StringStore` object.
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"""
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return srsly.json_dumps(sorted(self))
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def from_bytes(self, bytes_data, **kwargs):
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"""Load state from a binary string.
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bytes_data (bytes): The data to load from.
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RETURNS (StringStore): The `StringStore` object.
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"""
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strings = srsly.json_loads(bytes_data)
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prev = list(self)
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self._reset_and_load(strings)
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for word in prev:
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self.add(word)
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return self
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def _reset_and_load(self, strings):
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self.mem = Pool()
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self._map = PreshMap()
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self._keys.clear()
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for string in strings:
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self.add(string)
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def _get_interned_str(self, hash_value: int) -> str:
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cdef hash_t str_hash
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if not _try_coerce_to_hash(hash_value, &str_hash):
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raise TypeError(Errors.E4001.format(expected_types="'int'", received_type=type(hash_value)))
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# Handle reserved symbols and empty strings correctly.
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if str_hash == 0:
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return ""
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symbol = SYMBOLS_BY_INT.get(str_hash)
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if symbol is not None:
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return symbol
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utf8str = <Utf8Str*>self._map.get(str_hash)
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if utf8str is NULL:
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raise KeyError(Errors.E018.format(hash_value=str_hash))
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else:
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return self._decode_str_repr(utf8str)
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cdef hash_t _intern_str(self, str string):
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# TODO: This function's API/behaviour is an unholy mess...
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# 0 means missing, but we don't bother offsetting the index.
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chars = string.encode('utf-8')
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cdef hash_t key = hash64(<unsigned char*>chars, len(chars), 1)
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cdef Utf8Str* value = <Utf8Str*>self._map.get(key)
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if value is not NULL:
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return key
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value = self._allocate_str_repr(<unsigned char*>chars, len(chars))
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self._map.set(key, value)
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self._keys.push_back(key)
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return key
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cdef Utf8Str* _allocate_str_repr(self, const unsigned char* chars, uint32_t length) except *:
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cdef int n_length_bytes
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cdef int i
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cdef Utf8Str* string = <Utf8Str*>self.mem.alloc(1, sizeof(Utf8Str))
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cdef uint32_t ulength = length
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if length < sizeof(string.s):
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string.s[0] = <unsigned char>length
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memcpy(&string.s[1], chars, length)
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return string
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elif length < 255:
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string.p = <unsigned char*>self.mem.alloc(length + 1, sizeof(unsigned char))
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string.p[0] = length
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memcpy(&string.p[1], chars, length)
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return string
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else:
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i = 0
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n_length_bytes = (length // 255) + 1
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string.p = <unsigned char*>self.mem.alloc(length + n_length_bytes, sizeof(unsigned char))
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for i in range(n_length_bytes-1):
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string.p[i] = 255
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string.p[n_length_bytes-1] = length % 255
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memcpy(&string.p[n_length_bytes], chars, length)
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return string
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cdef str _decode_str_repr(self, const Utf8Str* string):
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cdef int i, length
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if string.s[0] < sizeof(string.s) and string.s[0] != 0:
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return string.s[1:string.s[0]+1].decode('utf-8')
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elif string.p[0] < 255:
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return string.p[1:string.p[0]+1].decode('utf-8')
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else:
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i = 0
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length = 0
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while string.p[i] == 255:
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i += 1
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length += 255
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length += string.p[i]
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i += 1
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return string.p[i:length + i].decode('utf-8')
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cpdef hash_t hash_string(object string) except -1:
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if not isinstance(string, str):
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raise TypeError(Errors.E4001.format(expected_types="'str'", received_type=type(string)))
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# Handle reserved symbols and empty strings correctly.
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if len(string) == 0:
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return 0
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symbol = SYMBOLS_BY_STR.get(string)
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if symbol is not None:
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return symbol
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chars = string.encode('utf-8')
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return hash64(<unsigned char*>chars, len(chars), 1)
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cpdef hash_t get_string_id(object string_or_hash) except -1:
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cdef hash_t str_hash
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try:
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return hash_string(string_or_hash)
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except:
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if _try_coerce_to_hash(string_or_hash, &str_hash):
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# Coerce the integral key to the expected primitive hash type.
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# This ensures that custom/overloaded "primitive" data types
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# such as those implemented by numpy are not inadvertently used
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# downsteam (as these are internally implemented as custom PyObjects
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# whose comparison operators can incur a significant overhead).
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return str_hash
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else:
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raise TypeError(Errors.E4001.format(expected_types="'str','int'", received_type=type(string_or_hash)))
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# Not particularly elegant, but this is faster than `isinstance(key, numbers.Integral)`
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cdef inline bint _try_coerce_to_hash(object key, hash_t* out_hash):
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try:
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out_hash[0] = key
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return True
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except:
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return False
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