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340 lines
15 KiB
Markdown
340 lines
15 KiB
Markdown
---
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title: EntityRecognizer
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tag: class
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source: spacy/pipeline/pipes.pyx
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---
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This class is a subclass of `Pipe` and follows the same API. The pipeline
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component is available in the [processing pipeline](/usage/processing-pipelines)
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via the ID `"ner"`.
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## Default config {#config}
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This is the default configuration used to initialize the model powering the
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pipeline component. See the [model architectures](/api/architectures)
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documentation for details on the architectures and their arguments and
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hyperparameters. To learn more about how to customize the config and train
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custom models, check out the [training config](/usage/training#config) docs.
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```python
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https://github.com/explosion/spaCy/blob/develop/spacy/pipeline/defaults/ner_defaults.cfg
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```
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## EntityRecognizer.\_\_init\_\_ {#init tag="method"}
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> #### Example
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>
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> ```python
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> # Construction via create_pipe
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> ner = nlp.create_pipe("ner")
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>
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> # Construction via create_pipe with custom model
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> config = {"model": {"@architectures": "my_ner"}}
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> parser = nlp.create_pipe("ner", config)
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>
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> # Construction from class with custom model from file
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> from spacy.pipeline import EntityRecognizer
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> model = util.load_config("model.cfg", create_objects=True)["model"]
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> ner = EntityRecognizer(nlp.vocab, model)
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> ```
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Create a new pipeline instance. In your application, you would normally use a
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shortcut for this and instantiate the component using its string name and
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[`nlp.create_pipe`](/api/language#create_pipe).
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| Name | Type | Description |
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| ----------- | ------------------ | ------------------------------------------------------------------------------- |
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| `vocab` | `Vocab` | The shared vocabulary. |
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| `model` | `Model` | The [`Model`](https://thinc.ai/docs/api-model) powering the pipeline component. |
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| `**cfg` | - | Configuration parameters. |
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| **RETURNS** | `EntityRecognizer` | The newly constructed object. |
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## EntityRecognizer.\_\_call\_\_ {#call tag="method"}
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Apply the pipe to one document. The document is modified in place, and returned.
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This usually happens under the hood when the `nlp` object is called on a text
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and all pipeline components are applied to the `Doc` in order. Both
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[`__call__`](/api/entityrecognizer#call) and
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[`pipe`](/api/entityrecognizer#pipe) delegate to the
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[`predict`](/api/entityrecognizer#predict) and
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[`set_annotations`](/api/entityrecognizer#set_annotations) methods.
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> #### Example
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>
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> ```python
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> ner = EntityRecognizer(nlp.vocab)
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> doc = nlp("This is a sentence.")
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> # This usually happens under the hood
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> processed = ner(doc)
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> ```
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| Name | Type | Description |
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| ----------- | ----- | ------------------------ |
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| `doc` | `Doc` | The document to process. |
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| **RETURNS** | `Doc` | The processed document. |
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## EntityRecognizer.pipe {#pipe tag="method"}
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Apply the pipe to a stream of documents. This usually happens under the hood
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when the `nlp` object is called on a text and all pipeline components are
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applied to the `Doc` in order. Both [`__call__`](/api/entityrecognizer#call) and
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[`pipe`](/api/entityrecognizer#pipe) delegate to the
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[`predict`](/api/entityrecognizer#predict) and
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[`set_annotations`](/api/entityrecognizer#set_annotations) methods.
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> #### Example
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>
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> ```python
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> ner = EntityRecognizer(nlp.vocab)
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> for doc in ner.pipe(docs, batch_size=50):
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> pass
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> ```
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| Name | Type | Description |
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| ------------ | --------------- | ------------------------------------------------------ |
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| `stream` | `Iterable[Doc]` | A stream of documents. |
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| `batch_size` | int | The number of texts to buffer. Defaults to `128`. |
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| **YIELDS** | `Doc` | Processed documents in the order of the original text. |
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## EntityRecognizer.predict {#predict tag="method"}
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Apply the pipeline's model to a batch of docs, without modifying them.
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> #### Example
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>
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> ```python
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> ner = EntityRecognizer(nlp.vocab)
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> scores = ner.predict([doc1, doc2])
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> ```
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| Name | Type | Description |
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| ----------- | ------------------ | ---------------------------------------------------------------------------------------------------------- |
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| `docs` | `Iterable[Doc]` | The documents to predict. |
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| **RETURNS** | `List[StateClass]` | List of `syntax.StateClass` objects. `syntax.StateClass` is a helper class for the parse state (internal). |
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## EntityRecognizer.set_annotations {#set_annotations tag="method"}
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Modify a batch of documents, using pre-computed scores.
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> #### Example
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>
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> ```python
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> ner = EntityRecognizer(nlp.vocab)
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> scores = ner.predict([doc1, doc2])
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> ner.set_annotations([doc1, doc2], scores)
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> ```
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| Name | Type | Description |
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| -------- | ------------------ | ---------------------------------------------------------- |
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| `docs` | `Iterable[Doc]` | The documents to modify. |
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| `scores` | `List[StateClass]` | The scores to set, produced by `EntityRecognizer.predict`. |
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## EntityRecognizer.update {#update tag="method"}
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Learn from a batch of [`Example`](/api/example) objects, updating the pipe's
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model. Delegates to [`predict`](/api/entityrecognizer#predict) and
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[`get_loss`](/api/entityrecognizer#get_loss).
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> #### Example
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>
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> ```python
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> ner = EntityRecognizer(nlp.vocab, ner_model)
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> optimizer = nlp.begin_training()
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> losses = ner.update(examples, sgd=optimizer)
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> ```
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| Name | Type | Description |
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| ----------------- | ------------------- | ---------------------------------------------------------------------------------------------------------------------------------------------- |
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| `examples` | `Iterable[Example]` | A batch of [`Example`](/api/example) objects to learn from. |
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| _keyword-only_ | | |
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| `drop` | float | The dropout rate. |
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| `set_annotations` | bool | Whether or not to update the `Example` objects with the predictions, delegating to [`set_annotations`](/api/entityrecognizer#set_annotations). |
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| `sgd` | `Optimizer` | The [`Optimizer`](https://thinc.ai/docs/api-optimizers) object. |
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| `losses` | `Dict[str, float]` | Optional record of the loss during training. The value keyed by the model's name is updated. |
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| **RETURNS** | `Dict[str, float]` | The updated `losses` dictionary. |
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## EntityRecognizer.get_loss {#get_loss tag="method"}
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Find the loss and gradient of loss for the batch of documents and their
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predicted scores.
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> #### Example
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>
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> ```python
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> ner = EntityRecognizer(nlp.vocab)
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> scores = ner.predict([eg.predicted for eg in examples])
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> loss, d_loss = ner.get_loss(examples, scores)
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> ```
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| Name | Type | Description |
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| ----------- | ------------------- | --------------------------------------------------- |
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| `examples` | `Iterable[Example]` | The batch of examples. |
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| `scores` | `List[StateClass]` | Scores representing the model's predictions. |
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| **RETURNS** | tuple | The loss and the gradient, i.e. `(loss, gradient)`. |
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## EntityRecognizer.begin_training {#begin_training tag="method"}
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Initialize the pipe for training, using data examples if available. Return an
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[`Optimizer`](https://thinc.ai/docs/api-optimizers) object.
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> #### Example
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>
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> ```python
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> ner = EntityRecognizer(nlp.vocab)
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> nlp.pipeline.append(ner)
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> optimizer = ner.begin_training(pipeline=nlp.pipeline)
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> ```
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| Name | Type | Description |
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| -------------- | ----------------------- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
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| `get_examples` | `Iterable[Example]` | Optional gold-standard annotations in the form of [`Example`](/api/example) objects. |
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| `pipeline` | `List[(str, callable)]` | Optional list of pipeline components that this component is part of. |
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| `sgd` | `Optimizer` | An optional [`Optimizer`](https://thinc.ai/docs/api-optimizers) object. Will be created via [`create_optimizer`](/api/entityrecognizer#create_optimizer) if not set. |
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| **RETURNS** | `Optimizer` | An optimizer. |
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## EntityRecognizer.create_optimizer {#create_optimizer tag="method"}
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Create an optimizer for the pipeline component.
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> #### Example
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>
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> ```python
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> ner = EntityRecognizer(nlp.vocab)
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> optimizer = ner.create_optimizer()
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> ```
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| Name | Type | Description |
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| ----------- | ----------- | --------------------------------------------------------------- |
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| **RETURNS** | `Optimizer` | The [`Optimizer`](https://thinc.ai/docs/api-optimizers) object. |
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## EntityRecognizer.use_params {#use_params tag="method, contextmanager"}
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Modify the pipe's model, to use the given parameter values.
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> #### Example
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>
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> ```python
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> ner = EntityRecognizer(nlp.vocab)
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> with ner.use_params(optimizer.averages):
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> ner.to_disk("/best_model")
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> ```
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| Name | Type | Description |
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| -------- | ---- | ---------------------------------------------------------------------------------------------------------- |
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| `params` | dict | The parameter values to use in the model. At the end of the context, the original parameters are restored. |
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## EntityRecognizer.add_label {#add_label tag="method"}
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Add a new label to the pipe.
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> #### Example
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>
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> ```python
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> ner = EntityRecognizer(nlp.vocab)
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> ner.add_label("MY_LABEL")
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> ```
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| Name | Type | Description |
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| ------- | ---- | ----------------- |
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| `label` | str | The label to add. |
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## EntityRecognizer.to_disk {#to_disk tag="method"}
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Serialize the pipe to disk.
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> #### Example
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>
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> ```python
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> ner = EntityRecognizer(nlp.vocab)
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> ner.to_disk("/path/to/ner")
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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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| `exclude` | list | String names of [serialization fields](#serialization-fields) to exclude. |
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## EntityRecognizer.from_disk {#from_disk tag="method"}
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Load the pipe from disk. Modifies the object in place and returns it.
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> #### Example
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>
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> ```python
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> ner = EntityRecognizer(nlp.vocab)
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> ner.from_disk("/path/to/ner")
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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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| `exclude` | list | String names of [serialization fields](#serialization-fields) to exclude. |
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| **RETURNS** | `EntityRecognizer` | The modified `EntityRecognizer` object. |
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## EntityRecognizer.to_bytes {#to_bytes tag="method"}
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> #### Example
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>
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> ```python
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> ner = EntityRecognizer(nlp.vocab)
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> ner_bytes = ner.to_bytes()
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> ```
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Serialize the pipe to a bytestring.
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| Name | Type | Description |
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| ----------- | ----- | ------------------------------------------------------------------------- |
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| `exclude` | list | String names of [serialization fields](#serialization-fields) to exclude. |
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| **RETURNS** | bytes | The serialized form of the `EntityRecognizer` object. |
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## EntityRecognizer.from_bytes {#from_bytes tag="method"}
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Load the pipe from a bytestring. Modifies the object in place and returns it.
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> #### Example
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>
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> ```python
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> ner_bytes = ner.to_bytes()
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> ner = EntityRecognizer(nlp.vocab)
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> ner.from_bytes(ner_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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| `exclude` | list | String names of [serialization fields](#serialization-fields) to exclude. |
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| **RETURNS** | `EntityRecognizer` | The `EntityRecognizer` object. |
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## EntityRecognizer.labels {#labels tag="property"}
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The labels currently added to the component.
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> #### Example
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>
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> ```python
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> ner.add_label("MY_LABEL")
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> assert "MY_LABEL" in ner.labels
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> ```
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| Name | Type | Description |
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| ----------- | ----- | ---------------------------------- |
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| **RETURNS** | tuple | The labels added to the component. |
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## Serialization fields {#serialization-fields}
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During serialization, spaCy will export several data fields used to restore
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different aspects of the object. If needed, you can exclude them from
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serialization by passing in the string names via the `exclude` argument.
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> #### Example
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>
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> ```python
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> data = ner.to_disk("/path", exclude=["vocab"])
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> ```
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| Name | Description |
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| ------- | -------------------------------------------------------------- |
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| `vocab` | The shared [`Vocab`](/api/vocab). |
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| `cfg` | The config file. You usually don't want to exclude this. |
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| `model` | The binary model data. You usually don't want to exclude this. |
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