spaCy/spacy/lookups.py

168 lines
5.3 KiB
Python
Raw Normal View History

# coding: utf8
from __future__ import unicode_literals
import srsly
from collections import OrderedDict
from .errors import Errors
from .util import SimpleFrozenDict, ensure_path
class Lookups(object):
"""Container for large lookup tables and dictionaries, e.g. lemmatization
data or tokenizer exception lists. Lookups are available via vocab.lookups,
so they can be accessed before the pipeline components are applied (e.g.
in the tokenizer and lemmatizer), as well as within the pipeline components
via doc.vocab.lookups.
Important note: At the moment, this class only performs a very basic
dictionary lookup. We're planning to replace this with a more efficient
implementation. See #3971 for details.
"""
def __init__(self):
"""Initialize the Lookups object.
RETURNS (Lookups): The newly created object.
"""
self._tables = OrderedDict()
def __contains__(self, name):
"""Check if the lookups contain a table of a given name. Delegates to
Lookups.has_table.
name (unicode): Name of the table.
2019-09-12 15:00:14 +03:00
RETURNS (bool): Whether a table of that name is in the lookups.
"""
return self.has_table(name)
def __len__(self):
"""RETURNS (int): The number of tables in the lookups."""
return len(self._tables)
@property
def tables(self):
"""RETURNS (list): Names of all tables in the lookups."""
return list(self._tables.keys())
def add_table(self, name, data=SimpleFrozenDict()):
"""Add a new table to the lookups. Raises an error if the table exists.
name (unicode): Unique name of table.
data (dict): Optional data to add to the table.
RETURNS (Table): The newly added table.
"""
if name in self.tables:
raise ValueError(Errors.E158.format(name=name))
table = Table(name=name)
table.update(data)
self._tables[name] = table
return table
def get_table(self, name):
"""Get a table. Raises an error if the table doesn't exist.
name (unicode): Name of the table.
RETURNS (Table): The table.
"""
if name not in self._tables:
raise KeyError(Errors.E159.format(name=name, tables=self.tables))
return self._tables[name]
def remove_table(self, name):
"""Remove a table. Raises an error if the table doesn't exist.
2019-09-12 15:00:14 +03:00
name (unicode): Name of the table to remove.
RETURNS (Table): The removed table.
"""
if name not in self._tables:
raise KeyError(Errors.E159.format(name=name, tables=self.tables))
return self._tables.pop(name)
def has_table(self, name):
"""Check if the lookups contain a table of a given name.
name (unicode): Name of the table.
RETURNS (bool): Whether a table of that name exists.
"""
return name in self._tables
2019-09-12 15:00:14 +03:00
def to_bytes(self, **kwargs):
"""Serialize the lookups to a bytestring.
RETURNS (bytes): The serialized Lookups.
"""
return srsly.msgpack_dumps(self._tables)
2019-09-12 15:00:14 +03:00
def from_bytes(self, bytes_data, **kwargs):
"""Load the lookups from a bytestring.
2019-09-12 15:00:14 +03:00
bytes_data (bytes): The data to load.
RETURNS (Lookups): The loaded Lookups.
"""
self._tables = OrderedDict()
msg = srsly.msgpack_loads(bytes_data)
for key, value in msg.items():
self._tables[key] = Table.from_dict(value)
return self
def to_disk(self, path, **kwargs):
2019-09-12 15:00:14 +03:00
"""Save the lookups to a directory as lookups.bin. Expects a path to a
directory, which will be created if it doesn't exist.
path (unicode / Path): The file path.
"""
if len(self._tables):
path = ensure_path(path)
2019-09-12 15:00:01 +03:00
if not path.exists():
path.mkdir()
filepath = path / "lookups.bin"
with filepath.open("wb") as file_:
file_.write(self.to_bytes())
def from_disk(self, path, **kwargs):
2019-09-12 15:00:14 +03:00
"""Load lookups from a directory containing a lookups.bin. Will skip
loading if the file doesn't exist.
2019-09-12 15:00:14 +03:00
path (unicode / Path): The directory path.
RETURNS (Lookups): The loaded lookups.
"""
path = ensure_path(path)
filepath = path / "lookups.bin"
if filepath.exists():
with filepath.open("rb") as file_:
data = file_.read()
return self.from_bytes(data)
return self
class Table(OrderedDict):
2019-09-12 15:00:14 +03:00
"""A table in the lookups. Subclass of OrderedDict that implements a
slightly more consistent and unified API.
"""
2019-09-11 15:00:36 +03:00
@classmethod
def from_dict(cls, data, name=None):
2019-09-12 15:00:14 +03:00
"""Initialize a new table from a dict.
data (dict): The dictionary.
name (unicode): Optional table name for reference.
RETURNS (Table): The newly created object.
"""
self = cls(name=name)
self.update(data)
return self
def __init__(self, name=None):
"""Initialize a new table.
name (unicode): Optional table name for reference.
RETURNS (Table): The newly created object.
"""
OrderedDict.__init__(self)
self.name = name
def set(self, key, value):
"""Set new key/value pair. Same as table[key] = value."""
self[key] = value