mirror of https://github.com/explosion/spaCy.git
318 lines
9.8 KiB
Markdown
318 lines
9.8 KiB
Markdown
---
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title: Lookups
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teaser: A container for large lookup tables and dictionaries
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tag: class
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source: spacy/lookups.py
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new: 2.2
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---
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This class allows convenient access to large lookup tables and dictionaries,
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e.g. lemmatization data or tokenizer exception lists using Bloom filters.
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Lookups are available via the [`Vocab`](/api/vocab) as `vocab.lookups`, so they
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can be accessed before the pipeline components are applied (e.g. in the
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tokenizer and lemmatizer), as well as within the pipeline components via
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`doc.vocab.lookups`.
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## Lookups.\_\_init\_\_ {#init tag="method"}
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Create a `Lookups` object.
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> #### Example
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>
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> ```python
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> from spacy.lookups import Lookups
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> lookups = Lookups()
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> ```
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| Name | Type | Description |
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| ----------- | --------- | ----------------------------- |
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| **RETURNS** | `Lookups` | The newly constructed object. |
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## Lookups.\_\_len\_\_ {#len tag="method"}
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Get the current number of tables in the lookups.
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> #### Example
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>
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> ```python
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> lookups = Lookups()
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> assert len(lookups) == 0
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> ```
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| Name | Type | Description |
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| ----------- | ---- | ------------------------------------ |
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| **RETURNS** | int | The number of tables in the lookups. |
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## Lookups.\_\contains\_\_ {#contains tag="method"}
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Check if the lookups contain a table of a given name. Delegates to
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[`Lookups.has_table`](/api/lookups#has_table).
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> #### Example
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>
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> ```python
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> lookups = Lookups()
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> lookups.add_table("some_table")
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> assert "some_table" in lookups
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> ```
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| Name | Type | Description |
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| ----------- | ---- | ----------------------------------------------- |
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| `name` | str | Name of the table. |
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| **RETURNS** | bool | Whether a table of that name is in the lookups. |
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## Lookups.tables {#tables tag="property"}
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Get the names of all tables in the lookups.
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> #### Example
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>
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> ```python
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> lookups = Lookups()
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> lookups.add_table("some_table")
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> assert lookups.tables == ["some_table"]
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> ```
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| Name | Type | Description |
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| ----------- | ---- | ----------------------------------- |
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| **RETURNS** | list | Names of the tables in the lookups. |
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## Lookups.add_table {#add_table tag="method"}
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Add a new table with optional data to the lookups. Raises an error if the table
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exists.
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> #### Example
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>
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> ```python
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> lookups = Lookups()
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> lookups.add_table("some_table", {"foo": "bar"})
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> ```
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| Name | Type | Description |
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| ----------- | ----------------------------- | ---------------------------------- |
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| `name` | str | Unique name of the table. |
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| `data` | dict | Optional data to add to the table. |
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| **RETURNS** | [`Table`](/api/lookups#table) | The newly added table. |
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## Lookups.get_table {#get_table tag="method"}
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Get a table from the lookups. Raises an error if the table doesn't exist.
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> #### Example
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>
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> ```python
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> lookups = Lookups()
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> lookups.add_table("some_table", {"foo": "bar"})
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> table = lookups.get_table("some_table")
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> assert table["foo"] == "bar"
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> ```
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| Name | Type | Description |
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| ----------- | ----------------------------- | ------------------ |
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| `name` | str | Name of the table. |
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| **RETURNS** | [`Table`](/api/lookups#table) | The table. |
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## Lookups.remove_table {#remove_table tag="method"}
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Remove a table from the lookups. Raises an error if the table doesn't exist.
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> #### Example
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>
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> ```python
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> lookups = Lookups()
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> lookups.add_table("some_table")
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> removed_table = lookups.remove_table("some_table")
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> assert "some_table" not in lookups
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> ```
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| Name | Type | Description |
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| ----------- | ----------------------------- | ---------------------------- |
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| `name` | str | Name of the table to remove. |
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| **RETURNS** | [`Table`](/api/lookups#table) | The removed table. |
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## Lookups.has_table {#has_table tag="method"}
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Check if the lookups contain a table of a given name. Equivalent to
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[`Lookups.__contains__`](/api/lookups#contains).
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> #### Example
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>
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> ```python
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> lookups = Lookups()
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> lookups.add_table("some_table")
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> assert lookups.has_table("some_table")
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> ```
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| Name | Type | Description |
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| ----------- | ---- | ----------------------------------------------- |
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| `name` | str | Name of the table. |
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| **RETURNS** | bool | Whether a table of that name is in the lookups. |
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## Lookups.to_bytes {#to_bytes tag="method"}
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Serialize the lookups to a bytestring.
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> #### Example
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>
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> ```python
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> lookup_bytes = lookups.to_bytes()
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> ```
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| Name | Type | Description |
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| ----------- | ----- | ----------------------- |
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| **RETURNS** | bytes | The serialized lookups. |
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## Lookups.from_bytes {#from_bytes tag="method"}
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Load the lookups from a bytestring.
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> #### Example
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>
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> ```python
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> lookup_bytes = lookups.to_bytes()
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> lookups = Lookups()
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> lookups.from_bytes(lookup_bytes)
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> ```
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| Name | Type | Description |
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| ------------ | --------- | ---------------------- |
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| `bytes_data` | bytes | The data to load from. |
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| **RETURNS** | `Lookups` | The loaded lookups. |
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## Lookups.to_disk {#to_disk tag="method"}
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Save the lookups to a directory as `lookups.bin`. Expects a path to a directory,
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which will be created if it doesn't exist.
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> #### Example
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>
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> ```python
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> lookups.to_disk("/path/to/lookups")
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> ```
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| Name | Type | Description |
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| ------ | ------------ | --------------------------------------------------------------------------------------------------------------------- |
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| `path` | str / `Path` | A path to a directory, which will be created if it doesn't exist. Paths may be either strings or `Path`-like objects. |
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## Lookups.from_disk {#from_disk tag="method"}
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Load lookups from a directory containing a `lookups.bin`. Will skip loading if
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the file doesn't exist.
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> #### Example
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>
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> ```python
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> from spacy.lookups import Lookups
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> lookups = Lookups()
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> lookups.from_disk("/path/to/lookups")
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> ```
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| Name | Type | Description |
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| ----------- | ------------ | -------------------------------------------------------------------------- |
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| `path` | str / `Path` | A path to a directory. Paths may be either strings or `Path`-like objects. |
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| **RETURNS** | `Lookups` | The loaded lookups. |
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## Table {#table tag="class, ordererddict"}
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A table in the lookups. Subclass of `OrderedDict` that implements a slightly
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more consistent and unified API and includes a Bloom filter to speed up missed
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lookups. Supports **all other methods and attributes** of `OrderedDict` /
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`dict`, and the customized methods listed here. Methods that get or set keys
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accept both integers and strings (which will be hashed before being added to the
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table).
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### Table.\_\_init\_\_ {#table.init tag="method"}
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Initialize a new table.
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> #### Example
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>
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> ```python
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> from spacy.lookups import Table
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> data = {"foo": "bar", "baz": 100}
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> table = Table(name="some_table", data=data)
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> assert "foo" in table
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> assert table["foo"] == "bar"
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> ```
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| Name | Type | Description |
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| ------ | ---- | ---------------------------------- |
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| `name` | str | Optional table name for reference. |
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### Table.from_dict {#table.from_dict tag="classmethod"}
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Initialize a new table from a dict.
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> #### Example
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>
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> ```python
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> from spacy.lookups import Table
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> data = {"foo": "bar", "baz": 100}
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> table = Table.from_dict(data, name="some_table")
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> ```
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| Name | Type | Description |
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| ----------- | ------- | ---------------------------------- |
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| `data` | dict | The dictionary. |
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| `name` | str | Optional table name for reference. |
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| **RETURNS** | `Table` | The newly constructed object. |
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### Table.set {#table.set tag="method"}
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Set a new key / value pair. String keys will be hashed. Same as
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`table[key] = value`.
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> #### Example
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>
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> ```python
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> from spacy.lookups import Table
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> table = Table()
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> table.set("foo", "bar")
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> assert table["foo"] == "bar"
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> ```
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| Name | Type | Description |
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| ------- | --------- | ----------- |
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| `key` | str / int | The key. |
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| `value` | - | The value. |
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### Table.to_bytes {#table.to_bytes tag="method"}
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Serialize the table to a bytestring.
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> #### Example
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>
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> ```python
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> table_bytes = table.to_bytes()
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> ```
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| Name | Type | Description |
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| ----------- | ----- | --------------------- |
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| **RETURNS** | bytes | The serialized table. |
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### Table.from_bytes {#table.from_bytes tag="method"}
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Load a table from a bytestring.
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> #### Example
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>
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> ```python
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> table_bytes = table.to_bytes()
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> table = Table()
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> table.from_bytes(table_bytes)
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> ```
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| Name | Type | Description |
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| ------------ | ------- | ----------------- |
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| `bytes_data` | bytes | The data to load. |
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| **RETURNS** | `Table` | The loaded table. |
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### Attributes {#table-attributes}
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| Name | Type | Description |
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| -------------- | --------------------------- | ----------------------------------------------------- |
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| `name` | str | Table name. |
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| `default_size` | int | Default size of bloom filters if no data is provided. |
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| `bloom` | `preshed.bloom.BloomFilter` | The bloom filters. |
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