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303 lines
12 KiB
Markdown
303 lines
12 KiB
Markdown
---
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title: InMemoryLookupKB
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teaser:
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The default implementation of the KnowledgeBase interface. Stores all
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information in-memory.
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tag: class
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source: spacy/kb/kb_in_memory.pyx
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new: 3.5
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---
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The `InMemoryLookupKB` class inherits from [`KnowledgeBase`](/api/kb) and
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implements all of its methods. It stores all KB data in-memory and generates
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[`Candidate`](/api/kb#candidate) objects by exactly matching mentions with
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entity names. It's highly optimized for both a low memory footprint and speed of
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retrieval.
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## InMemoryLookupKB.\_\_init\_\_ {#init tag="method"}
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Create the knowledge base.
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> #### Example
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>
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> ```python
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> from spacy.kb import InMemoryLookupKB
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> vocab = nlp.vocab
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> kb = InMemoryLookupKB(vocab=vocab, entity_vector_length=64)
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> ```
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| Name | Description |
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| ---------------------- | ------------------------------------------------ |
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| `vocab` | The shared vocabulary. ~~Vocab~~ |
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| `entity_vector_length` | Length of the fixed-size entity vectors. ~~int~~ |
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## InMemoryLookupKB.entity_vector_length {#entity_vector_length tag="property"}
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The length of the fixed-size entity vectors in the knowledge base.
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| Name | Description |
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| ----------- | ------------------------------------------------ |
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| **RETURNS** | Length of the fixed-size entity vectors. ~~int~~ |
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## InMemoryLookupKB.add_entity {#add_entity tag="method"}
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Add an entity to the knowledge base, specifying its corpus frequency and entity
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vector, which should be of length
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[`entity_vector_length`](/api/kb_in_memory#entity_vector_length).
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> #### Example
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>
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> ```python
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> kb.add_entity(entity="Q42", freq=32, entity_vector=vector1)
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> kb.add_entity(entity="Q463035", freq=111, entity_vector=vector2)
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> ```
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| Name | Description |
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| --------------- | ---------------------------------------------------------- |
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| `entity` | The unique entity identifier. ~~str~~ |
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| `freq` | The frequency of the entity in a typical corpus. ~~float~~ |
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| `entity_vector` | The pretrained vector of the entity. ~~numpy.ndarray~~ |
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## InMemoryLookupKB.set_entities {#set_entities tag="method"}
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Define the full list of entities in the knowledge base, specifying the corpus
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frequency and entity vector for each entity.
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> #### Example
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>
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> ```python
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> kb.set_entities(entity_list=["Q42", "Q463035"], freq_list=[32, 111], vector_list=[vector1, vector2])
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> ```
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| Name | Description |
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| ------------- | ---------------------------------------------------------------- |
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| `entity_list` | List of unique entity identifiers. ~~Iterable[Union[str, int]]~~ |
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| `freq_list` | List of entity frequencies. ~~Iterable[int]~~ |
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| `vector_list` | List of entity vectors. ~~Iterable[numpy.ndarray]~~ |
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## InMemoryLookupKB.add_alias {#add_alias tag="method"}
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Add an alias or mention to the knowledge base, specifying its potential KB
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identifiers and their prior probabilities. The entity identifiers should refer
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to entities previously added with [`add_entity`](/api/kb_in_memory#add_entity)
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or [`set_entities`](/api/kb_in_memory#set_entities). The sum of the prior
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probabilities should not exceed 1. Note that an empty string can not be used as
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alias.
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> #### Example
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>
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> ```python
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> kb.add_alias(alias="Douglas", entities=["Q42", "Q463035"], probabilities=[0.6, 0.3])
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> ```
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| Name | Description |
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| --------------- | --------------------------------------------------------------------------------- |
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| `alias` | The textual mention or alias. Can not be the empty string. ~~str~~ |
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| `entities` | The potential entities that the alias may refer to. ~~Iterable[Union[str, int]]~~ |
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| `probabilities` | The prior probabilities of each entity. ~~Iterable[float]~~ |
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## InMemoryLookupKB.\_\_len\_\_ {#len tag="method"}
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Get the total number of entities in the knowledge base.
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> #### Example
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>
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> ```python
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> total_entities = len(kb)
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> ```
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| Name | Description |
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| ----------- | ----------------------------------------------------- |
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| **RETURNS** | The number of entities in the knowledge base. ~~int~~ |
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## InMemoryLookupKB.get_entity_strings {#get_entity_strings tag="method"}
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Get a list of all entity IDs in the knowledge base.
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> #### Example
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>
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> ```python
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> all_entities = kb.get_entity_strings()
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> ```
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| Name | Description |
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| ----------- | --------------------------------------------------------- |
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| **RETURNS** | The list of entities in the knowledge base. ~~List[str]~~ |
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## InMemoryLookupKB.get_size_aliases {#get_size_aliases tag="method"}
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Get the total number of aliases in the knowledge base.
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> #### Example
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>
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> ```python
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> total_aliases = kb.get_size_aliases()
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> ```
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| Name | Description |
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| ----------- | ---------------------------------------------------- |
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| **RETURNS** | The number of aliases in the knowledge base. ~~int~~ |
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## InMemoryLookupKB.get_alias_strings {#get_alias_strings tag="method"}
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Get a list of all aliases in the knowledge base.
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> #### Example
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>
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> ```python
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> all_aliases = kb.get_alias_strings()
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> ```
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| Name | Description |
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| ----------- | -------------------------------------------------------- |
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| **RETURNS** | The list of aliases in the knowledge base. ~~List[str]~~ |
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## InMemoryLookupKB.get_candidates {#get_candidates tag="method"}
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Given a certain textual mention as input, retrieve a list of candidate entities
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of type [`Candidate`](/api/kb#candidate). Wraps
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[`get_alias_candidates()`](/api/kb_in_memory#get_alias_candidates).
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> #### Example
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>
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> ```python
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> from spacy.lang.en import English
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> nlp = English()
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> doc = nlp("Douglas Adams wrote 'The Hitchhiker's Guide to the Galaxy'.")
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> candidates = kb.get_candidates(doc[0:2])
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> ```
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| Name | Description |
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| ----------- | -------------------------------------------------------------------- |
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| `mention` | The textual mention or alias. ~~Span~~ |
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| **RETURNS** | An iterable of relevant `Candidate` objects. ~~Iterable[Candidate]~~ |
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## InMemoryLookupKB.get_candidates_batch {#get_candidates_batch tag="method"}
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Same as [`get_candidates()`](/api/kb_in_memory#get_candidates), but for an
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arbitrary number of mentions. The [`EntityLinker`](/api/entitylinker) component
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will call `get_candidates_batch()` instead of `get_candidates()`, if the config
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parameter `candidates_batch_size` is greater or equal than 1.
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The default implementation of `get_candidates_batch()` executes
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`get_candidates()` in a loop. We recommend implementing a more efficient way to
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retrieve candidates for multiple mentions at once, if performance is of concern
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to you.
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> #### Example
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>
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> ```python
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> from spacy.lang.en import English
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> nlp = English()
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> doc = nlp("Douglas Adams wrote 'The Hitchhiker's Guide to the Galaxy'.")
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> candidates = kb.get_candidates((doc[0:2], doc[3:]))
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> ```
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| Name | Description |
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| ----------- | -------------------------------------------------------------------------------------------- |
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| `mentions` | The textual mention or alias. ~~Iterable[Span]~~ |
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| **RETURNS** | An iterable of iterable with relevant `Candidate` objects. ~~Iterable[Iterable[Candidate]]~~ |
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## InMemoryLookupKB.get_alias_candidates {#get_alias_candidates tag="method"}
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Given a certain textual mention as input, retrieve a list of candidate entities
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of type [`Candidate`](/api/kb#candidate).
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> #### Example
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>
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> ```python
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> candidates = kb.get_alias_candidates("Douglas")
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> ```
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| Name | Description |
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| ----------- | ------------------------------------------------------------- |
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| `alias` | The textual mention or alias. ~~str~~ |
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| **RETURNS** | The list of relevant `Candidate` objects. ~~List[Candidate]~~ |
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## InMemoryLookupKB.get_vector {#get_vector tag="method"}
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Given a certain entity ID, retrieve its pretrained entity vector.
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> #### Example
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>
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> ```python
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> vector = kb.get_vector("Q42")
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> ```
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| Name | Description |
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| ----------- | ------------------------------------ |
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| `entity` | The entity ID. ~~str~~ |
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| **RETURNS** | The entity vector. ~~numpy.ndarray~~ |
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## InMemoryLookupKB.get_vectors {#get_vectors tag="method"}
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Same as [`get_vector()`](/api/kb_in_memory#get_vector), but for an arbitrary
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number of entity IDs.
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The default implementation of `get_vectors()` executes `get_vector()` in a loop.
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We recommend implementing a more efficient way to retrieve vectors for multiple
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entities at once, if performance is of concern to you.
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> #### Example
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>
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> ```python
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> vectors = kb.get_vectors(("Q42", "Q3107329"))
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> ```
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| Name | Description |
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| ----------- | --------------------------------------------------------- |
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| `entities` | The entity IDs. ~~Iterable[str]~~ |
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| **RETURNS** | The entity vectors. ~~Iterable[Iterable[numpy.ndarray]]~~ |
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## InMemoryLookupKB.get_prior_prob {#get_prior_prob tag="method"}
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Given a certain entity ID and a certain textual mention, retrieve the prior
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probability of the fact that the mention links to the entity ID.
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> #### Example
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>
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> ```python
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> probability = kb.get_prior_prob("Q42", "Douglas")
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> ```
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| Name | Description |
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| ----------- | ------------------------------------------------------------------------- |
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| `entity` | The entity ID. ~~str~~ |
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| `alias` | The textual mention or alias. ~~str~~ |
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| **RETURNS** | The prior probability of the `alias` referring to the `entity`. ~~float~~ |
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## InMemoryLookupKB.to_disk {#to_disk tag="method"}
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Save the current state of the knowledge base to a directory.
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> #### Example
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>
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> ```python
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> kb.to_disk(path)
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> ```
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| Name | Description |
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| --------- | ------------------------------------------------------------------------------------------------------------------------------------------ |
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| `path` | A path to a directory, which will be created if it doesn't exist. Paths may be either strings or `Path`-like objects. ~~Union[str, Path]~~ |
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| `exclude` | List of components to exclude. ~~Iterable[str]~~ |
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## InMemoryLookupKB.from_disk {#from_disk tag="method"}
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Restore the state of the knowledge base from a given directory. Note that the
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[`Vocab`](/api/vocab) should also be the same as the one used to create the KB.
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> #### Example
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>
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> ```python
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> from spacy.vocab import Vocab
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> vocab = Vocab().from_disk("/path/to/vocab")
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> kb = FullyImplementedKB(vocab=vocab, entity_vector_length=64)
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> kb.from_disk("/path/to/kb")
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> ```
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| Name | Description |
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| ----------- | ----------------------------------------------------------------------------------------------- |
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| `loc` | A path to a directory. Paths may be either strings or `Path`-like objects. ~~Union[str, Path]~~ |
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| `exclude` | List of components to exclude. ~~Iterable[str]~~ |
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| **RETURNS** | The modified `KnowledgeBase` object. ~~KnowledgeBase~~ |
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