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269 lines
11 KiB
Markdown
269 lines
11 KiB
Markdown
---
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title: KnowledgeBase
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teaser: A storage class for entities and aliases of a specific knowledge base (ontology)
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tag: class
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source: spacy/kb.pyx
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new: 2.2
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---
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The `KnowledgeBase` object provides a method to generate [`Candidate`](/api/kb/#candidate_init)
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objects, which are plausible external identifiers given a certain textual mention.
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Each such `Candidate` holds information from the relevant KB entities,
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such as its frequency in text and possible aliases.
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Each entity in the knowledge base also has a pretrained entity vector of a fixed size.
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## KnowledgeBase.\_\_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 KnowledgeBase
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> vocab = nlp.vocab
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> kb = KnowledgeBase(vocab=vocab, entity_vector_length=64)
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> ```
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| Name | Type | Description |
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| ----------------------- | ---------------- | ----------------------------------------- |
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| `vocab` | `Vocab` | A `Vocab` object. |
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| `entity_vector_length` | int | Length of the fixed-size entity vectors. |
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| **RETURNS** | `KnowledgeBase` | The newly constructed object. |
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## KnowledgeBase.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 | Type | Description |
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| ----------- | ---- | ----------------------------------------- |
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| **RETURNS** | int | Length of the fixed-size entity vectors. |
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## KnowledgeBase.add_entity {#add_entity tag="method"}
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Add an entity to the knowledge base, specifying its corpus frequency
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and entity vector, which should be of length [`entity_vector_length`](/api/kb#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 | Type | Description |
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| --------------- | ------------- | ------------------------------------------------- |
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| `entity` | unicode | The unique entity identifier |
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| `freq` | float | The frequency of the entity in a typical corpus |
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| `entity_vector` | vector | The pretrained vector of the entity |
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## KnowledgeBase.set_entities {#set_entities tag="method"}
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Define the full list of entities in the knowledge base, specifying the corpus frequency
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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 | Type | Description |
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| ------------- | ------------- | ------------------------------------------------- |
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| `entity_list` | iterable | List of unique entity identifiers |
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| `freq_list` | iterable | List of entity frequencies |
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| `vector_list` | iterable | List of entity vectors |
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## KnowledgeBase.add_alias {#add_alias tag="method"}
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Add an alias or mention to the knowledge base, specifying its potential KB identifiers
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and their prior probabilities. The entity identifiers should refer to entities previously
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added with [`add_entity`](/api/kb#add_entity) or [`set_entities`](/api/kb#set_entities).
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The sum of the prior probabilities should not exceed 1.
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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 | Type | Description |
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| -------------- | ------------- | -------------------------------------------------- |
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| `alias` | unicode | The textual mention or alias |
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| `entities` | iterable | The potential entities that the alias may refer to |
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| `probabilities`| iterable | The prior probabilities of each entity |
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## KnowledgeBase.\_\_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 | Type | Description |
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| ----------- | ---- | --------------------------------------------- |
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| **RETURNS** | int | The number of entities in the knowledge base. |
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## KnowledgeBase.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 | Type | Description |
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| ----------- | ---- | --------------------------------------------- |
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| **RETURNS** | list | The list of entities in the knowledge base. |
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## KnowledgeBase.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 | Type | Description |
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| ----------- | ---- | --------------------------------------------- |
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| **RETURNS** | int | The number of aliases in the knowledge base. |
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## KnowledgeBase.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 | Type | Description |
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| ----------- | ---- | --------------------------------------------- |
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| **RETURNS** | list | The list of aliases in the knowledge base. |
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## KnowledgeBase.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_init).
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> #### Example
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>
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> ```python
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> candidates = kb.get_candidates("Douglas")
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> ```
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| Name | Type | Description |
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| ------------- | ------------- | -------------------------------------------------- |
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| `alias` | unicode | The textual mention or alias |
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| **RETURNS** | iterable | The list of relevant `Candidate` objects |
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## KnowledgeBase.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 | Type | Description |
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| ------------- | ------------- | -------------------------------------------------- |
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| `entity` | unicode | The entity ID |
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| **RETURNS** | vector | The entity vector |
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## KnowledgeBase.get_prior_prob {#get_prior_prob tag="method"}
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Given a certain entity ID and a certain textual mention, retrieve
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the prior 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 | Type | Description |
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| ------------- | ------------- | --------------------------------------------------------------- |
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| `entity` | unicode | The entity ID |
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| `alias` | unicode | The textual mention or alias |
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| **RETURNS** | float | The prior probability of the `alias` referring to the `entity` |
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## KnowledgeBase.dump {#dump 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.dump(loc)
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> ```
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| Name | Type | Description |
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| ------------- | ---------------- | ------------------------------------------------------------------------------------------------------------------------ |
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| `loc` | unicode / `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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## KnowledgeBase.load_bulk {#load_bulk tag="method"}
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Restore the state of the knowledge base from a given directory. Note that the [`Vocab`](/api/vocab)
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should also be the same as the one used to create the KB.
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> #### Example
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> ```python
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> from spacy.kb import KnowledgeBase
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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 = KnowledgeBase(vocab=vocab, entity_vector_length=64)
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> kb.load_bulk("/path/to/kb")
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> ```
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| Name | Type | Description |
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| ----------- | ---------------- | ----------------------------------------------------------------------------------------- |
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| `loc` | unicode / `Path` | A path to a directory. Paths may be either strings or `Path`-like objects. |
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| **RETURNS** | `KnowledgeBase` | The modified `KnowledgeBase` object. |
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## Candidate.\_\_init\_\_ {#candidate_init tag="method"}
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Construct a `Candidate` object. Usually this constructor is not called directly,
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but instead these objects are returned by the [`get_candidates`](/api/kb#get_candidates) method
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of a `KnowledgeBase`.
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> #### Example
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>
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> ```python
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> from spacy.kb import Candidate
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> candidate = Candidate(kb, entity_hash, entity_freq, entity_vector, alias_hash, prior_prob)
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> ```
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| Name | Type | Description |
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| ------------- | --------------- | -------------------------------------------------------------- |
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| `kb` | `KnowledgeBase` | The knowledge base that defined this candidate. |
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| `entity_hash` | int | The hash of the entity's KB ID. |
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| `entity_freq` | float | The entity frequency as recorded in the KB. |
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| `alias_hash` | int | The hash of the textual mention or alias. |
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| `prior_prob` | float | The prior probability of the `alias` referring to the `entity` |
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| **RETURNS** | `Candidate` | The newly constructed object. |
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## Candidate attributes {#candidate_attributes}
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| Name | Type | Description |
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| ---------------------- | ------------ | ------------------------------------------------------------------ |
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| `entity` | int | The entity's unique KB identifier |
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| `entity_` | unicode | The entity's unique KB identifier |
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| `alias` | int | The alias or textual mention |
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| `alias_` | unicode | The alias or textual mention |
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| `prior_prob` | long | The prior probability of the `alias` referring to the `entity` |
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| `entity_freq` | long | The frequency of the entity in a typical corpus |
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| `entity_vector` | vector | The pretrained vector of the entity |
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