mirror of https://github.com/explosion/spaCy.git
410 lines
24 KiB
Plaintext
410 lines
24 KiB
Plaintext
---
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title: EditTreeLemmatizer
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tag: class
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source: spacy/pipeline/edit_tree_lemmatizer.py
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version: 3.3
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teaser: 'Pipeline component for lemmatization'
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api_base_class: /api/pipe
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api_string_name: trainable_lemmatizer
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api_trainable: true
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---
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A trainable component for assigning base forms to tokens. This lemmatizer uses
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**edit trees** to transform tokens into base forms. The lemmatization model
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predicts which edit tree is applicable to a token. The edit tree data structure
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and construction method used by this lemmatizer were proposed in
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[Joint Lemmatization and Morphological Tagging with Lemming](https://aclanthology.org/D15-1272.pdf)
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(Thomas Müller et al., 2015).
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For a lookup and rule-based lemmatizer, see [`Lemmatizer`](/api/lemmatizer).
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## Assigned Attributes {id="assigned-attributes"}
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Predictions are assigned to `Token.lemma`.
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| Location | Value |
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| -------------- | ------------------------- |
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| `Token.lemma` | The lemma (hash). ~~int~~ |
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| `Token.lemma_` | The lemma. ~~str~~ |
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## Config and implementation {id="config"}
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The default config is defined by the pipeline component factory and describes
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how the component should be configured. You can override its settings via the
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`config` argument on [`nlp.add_pipe`](/api/language#add_pipe) or in your
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[`config.cfg` for training](/usage/training#config). See the
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[model architectures](/api/architectures) documentation for details on the
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architectures and their arguments and hyperparameters.
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> #### Example
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>
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> ```python
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> from spacy.pipeline.edit_tree_lemmatizer import DEFAULT_EDIT_TREE_LEMMATIZER_MODEL
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> config = {"model": DEFAULT_EDIT_TREE_LEMMATIZER_MODEL}
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> nlp.add_pipe("trainable_lemmatizer", config=config, name="lemmatizer")
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> ```
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| Setting | Description |
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| --------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ |
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| `model` | A model instance that predicts the edit tree probabilities. The output vectors should match the number of edit trees in size, and be normalized as probabilities (all scores between 0 and 1, with the rows summing to `1`). Defaults to [Tagger](/api/architectures#Tagger). ~~Model[List[Doc], List[Floats2d]]~~ |
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| `backoff` | ~~Token~~ attribute to use when no applicable edit tree is found. Defaults to `orth`. ~~str~~ |
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| `min_tree_freq` | Minimum frequency of an edit tree in the training set to be used. Defaults to `3`. ~~int~~ |
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| `overwrite` | Whether existing annotation is overwritten. Defaults to `False`. ~~bool~~ |
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| `top_k` | The number of most probable edit trees to try before resorting to `backoff`. Defaults to `1`. ~~int~~ |
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| `scorer` | The scoring method. Defaults to [`Scorer.score_token_attr`](/api/scorer#score_token_attr) for the attribute `"lemma"`. ~~Optional[Callable]~~ |
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```python
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%%GITHUB_SPACY/spacy/pipeline/edit_tree_lemmatizer.py
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```
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## EditTreeLemmatizer.\_\_init\_\_ {id="init",tag="method"}
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> #### Example
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>
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> ```python
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> # Construction via add_pipe with default model
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> lemmatizer = nlp.add_pipe("trainable_lemmatizer", name="lemmatizer")
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>
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> # Construction via create_pipe with custom model
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> config = {"model": {"@architectures": "my_tagger"}}
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> lemmatizer = nlp.add_pipe("trainable_lemmatizer", config=config, name="lemmatizer")
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>
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> # Construction from class
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> from spacy.pipeline import EditTreeLemmatizer
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> lemmatizer = EditTreeLemmatizer(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.add_pipe`](/api/language#add_pipe).
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| Name | Description |
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| --------------- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
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| `vocab` | The shared vocabulary. ~~Vocab~~ |
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| `model` | A model instance that predicts the edit tree probabilities. The output vectors should match the number of edit trees in size, and be normalized as probabilities (all scores between 0 and 1, with the rows summing to `1`). ~~Model[List[Doc], List[Floats2d]]~~ |
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| `name` | String name of the component instance. Used to add entries to the `losses` during training. ~~str~~ |
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| _keyword-only_ | |
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| `backoff` | ~~Token~~ attribute to use when no applicable edit tree is found. Defaults to `orth`. ~~str~~ |
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| `min_tree_freq` | Minimum frequency of an edit tree in the training set to be used. Defaults to `3`. ~~int~~ |
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| `overwrite` | Whether existing annotation is overwritten. Defaults to `False`. ~~bool~~ |
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| `top_k` | The number of most probable edit trees to try before resorting to `backoff`. Defaults to `1`. ~~int~~ |
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| `scorer` | The scoring method. Defaults to [`Scorer.score_token_attr`](/api/scorer#score_token_attr) for the attribute `"lemma"`. ~~Optional[Callable]~~ |
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## EditTreeLemmatizer.\_\_call\_\_ {id="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/edittreelemmatizer#call) and
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[`pipe`](/api/edittreelemmatizer#pipe) delegate to the
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[`predict`](/api/edittreelemmatizer#predict) and
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[`set_annotations`](/api/edittreelemmatizer#set_annotations) methods.
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> #### Example
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>
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> ```python
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> doc = nlp("This is a sentence.")
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> lemmatizer = nlp.add_pipe("trainable_lemmatizer", name="lemmatizer")
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> # This usually happens under the hood
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> processed = lemmatizer(doc)
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> ```
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| Name | Description |
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| ----------- | -------------------------------- |
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| `doc` | The document to process. ~~Doc~~ |
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| **RETURNS** | The processed document. ~~Doc~~ |
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## EditTreeLemmatizer.pipe {id="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/edittreelemmatizer#call)
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and [`pipe`](/api/edittreelemmatizer#pipe) delegate to the
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[`predict`](/api/edittreelemmatizer#predict) and
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[`set_annotations`](/api/edittreelemmatizer#set_annotations) methods.
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> #### Example
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>
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> ```python
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> lemmatizer = nlp.add_pipe("trainable_lemmatizer", name="lemmatizer")
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> for doc in lemmatizer.pipe(docs, batch_size=50):
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> pass
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> ```
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| Name | Description |
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| -------------- | ------------------------------------------------------------- |
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| `stream` | A stream of documents. ~~Iterable[Doc]~~ |
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| _keyword-only_ | |
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| `batch_size` | The number of documents to buffer. Defaults to `128`. ~~int~~ |
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| **YIELDS** | The processed documents in order. ~~Doc~~ |
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## EditTreeLemmatizer.initialize {id="initialize",tag="method",version="3"}
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Initialize the component for training. `get_examples` should be a function that
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returns an iterable of [`Example`](/api/example) objects. **At least one example
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should be supplied.** The data examples are used to **initialize the model** of
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the component and can either be the full training data or a representative
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sample. Initialization includes validating the network,
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[inferring missing shapes](https://thinc.ai/docs/usage-models#validation) and
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setting up the label scheme based on the data. This method is typically called
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by [`Language.initialize`](/api/language#initialize) and lets you customize
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arguments it receives via the
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[`[initialize.components]`](/api/data-formats#config-initialize) block in the
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config.
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> #### Example
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>
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> ```python
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> lemmatizer = nlp.add_pipe("trainable_lemmatizer", name="lemmatizer")
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> lemmatizer.initialize(lambda: examples, nlp=nlp)
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> ```
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>
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> ```ini
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> ### config.cfg
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> [initialize.components.lemmatizer]
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>
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> [initialize.components.lemmatizer.labels]
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> @readers = "spacy.read_labels.v1"
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> path = "corpus/labels/lemmatizer.json
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> ```
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| Name | Description |
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| -------------- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
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| `get_examples` | Function that returns gold-standard annotations in the form of [`Example`](/api/example) objects. Must contain at least one `Example`. ~~Callable[[], Iterable[Example]]~~ |
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| _keyword-only_ | |
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| `nlp` | The current `nlp` object. Defaults to `None`. ~~Optional[Language]~~ |
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| `labels` | The label information to add to the component, as provided by the [`label_data`](#label_data) property after initialization. To generate a reusable JSON file from your data, you should run the [`init labels`](/api/cli#init-labels) command. If no labels are provided, the `get_examples` callback is used to extract the labels from the data, which may be a lot slower. ~~Optional[Iterable[str]]~~ |
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## EditTreeLemmatizer.predict {id="predict",tag="method"}
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Apply the component's model to a batch of [`Doc`](/api/doc) objects, without
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modifying them.
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> #### Example
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>
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> ```python
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> lemmatizer = nlp.add_pipe("trainable_lemmatizer", name="lemmatizer")
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> tree_ids = lemmatizer.predict([doc1, doc2])
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> ```
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| Name | Description |
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| ----------- | ------------------------------------------- |
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| `docs` | The documents to predict. ~~Iterable[Doc]~~ |
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| **RETURNS** | The model's prediction for each document. |
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## EditTreeLemmatizer.set_annotations {id="set_annotations",tag="method"}
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Modify a batch of [`Doc`](/api/doc) objects, using pre-computed tree
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identifiers.
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> #### Example
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>
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> ```python
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> lemmatizer = nlp.add_pipe("trainable_lemmatizer", name="lemmatizer")
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> tree_ids = lemmatizer.predict([doc1, doc2])
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> lemmatizer.set_annotations([doc1, doc2], tree_ids)
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> ```
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| Name | Description |
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| ---------- | ------------------------------------------------------------------------------------- |
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| `docs` | The documents to modify. ~~Iterable[Doc]~~ |
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| `tree_ids` | The identifiers of the edit trees to apply, produced by `EditTreeLemmatizer.predict`. |
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## EditTreeLemmatizer.update {id="update",tag="method"}
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Learn from a batch of [`Example`](/api/example) objects containing the
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predictions and gold-standard annotations, and update the component's model.
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Delegates to [`predict`](/api/edittreelemmatizer#predict) and
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[`get_loss`](/api/edittreelemmatizer#get_loss).
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> #### Example
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>
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> ```python
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> lemmatizer = nlp.add_pipe("trainable_lemmatizer", name="lemmatizer")
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> optimizer = nlp.initialize()
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> losses = lemmatizer.update(examples, sgd=optimizer)
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> ```
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| Name | Description |
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| -------------- | ------------------------------------------------------------------------------------------------------------------------ |
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| `examples` | A batch of [`Example`](/api/example) objects to learn from. ~~Iterable[Example]~~ |
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| _keyword-only_ | |
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| `drop` | The dropout rate. ~~float~~ |
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| `sgd` | An optimizer. Will be created via [`create_optimizer`](#create_optimizer) if not set. ~~Optional[Optimizer]~~ |
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| `losses` | Optional record of the loss during training. Updated using the component name as the key. ~~Optional[Dict[str, float]]~~ |
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| **RETURNS** | The updated `losses` dictionary. ~~Dict[str, float]~~ |
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## EditTreeLemmatizer.get_loss {id="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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> lemmatizer = nlp.add_pipe("trainable_lemmatizer", name="lemmatizer")
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> scores = lemmatizer.model.begin_update([eg.predicted for eg in examples])
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> loss, d_loss = lemmatizer.get_loss(examples, scores)
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> ```
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| Name | Description |
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| ----------- | --------------------------------------------------------------------------- |
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| `examples` | The batch of examples. ~~Iterable[Example]~~ |
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| `scores` | Scores representing the model's predictions. |
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| **RETURNS** | The loss and the gradient, i.e. `(loss, gradient)`. ~~Tuple[float, float]~~ |
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## EditTreeLemmatizer.create_optimizer {id="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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> lemmatizer = nlp.add_pipe("trainable_lemmatizer", name="lemmatizer")
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> optimizer = lemmatizer.create_optimizer()
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> ```
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| Name | Description |
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| ----------- | ---------------------------- |
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| **RETURNS** | The optimizer. ~~Optimizer~~ |
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## EditTreeLemmatizer.use_params {id="use_params",tag="method, contextmanager"}
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Modify the pipe's model, to use the given parameter values. At the end of the
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context, the original parameters are restored.
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> #### Example
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>
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> ```python
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> lemmatizer = nlp.add_pipe("trainable_lemmatizer", name="lemmatizer")
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> with lemmatizer.use_params(optimizer.averages):
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> lemmatizer.to_disk("/best_model")
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> ```
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| Name | Description |
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| -------- | -------------------------------------------------- |
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| `params` | The parameter values to use in the model. ~~dict~~ |
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## EditTreeLemmatizer.to_disk {id="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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> lemmatizer = nlp.add_pipe("trainable_lemmatizer", name="lemmatizer")
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> lemmatizer.to_disk("/path/to/lemmatizer")
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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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| _keyword-only_ | |
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| `exclude` | String names of [serialization fields](#serialization-fields) to exclude. ~~Iterable[str]~~ |
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## EditTreeLemmatizer.from_disk {id="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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> lemmatizer = nlp.add_pipe("trainable_lemmatizer", name="lemmatizer")
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> lemmatizer.from_disk("/path/to/lemmatizer")
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> ```
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| Name | Description |
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| -------------- | ----------------------------------------------------------------------------------------------- |
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| `path` | A path to a directory. Paths may be either strings or `Path`-like objects. ~~Union[str, Path]~~ |
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| _keyword-only_ | |
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| `exclude` | String names of [serialization fields](#serialization-fields) to exclude. ~~Iterable[str]~~ |
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| **RETURNS** | The modified `EditTreeLemmatizer` object. ~~EditTreeLemmatizer~~ |
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## EditTreeLemmatizer.to_bytes {id="to_bytes",tag="method"}
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> #### Example
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>
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> ```python
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> lemmatizer = nlp.add_pipe("trainable_lemmatizer", name="lemmatizer")
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> lemmatizer_bytes = lemmatizer.to_bytes()
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> ```
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Serialize the pipe to a bytestring.
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| Name | Description |
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| -------------- | ------------------------------------------------------------------------------------------- |
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| _keyword-only_ | |
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| `exclude` | String names of [serialization fields](#serialization-fields) to exclude. ~~Iterable[str]~~ |
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| **RETURNS** | The serialized form of the `EditTreeLemmatizer` object. ~~bytes~~ |
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## EditTreeLemmatizer.from_bytes {id="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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> lemmatizer_bytes = lemmatizer.to_bytes()
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> lemmatizer = nlp.add_pipe("trainable_lemmatizer", name="lemmatizer")
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> lemmatizer.from_bytes(lemmatizer_bytes)
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> ```
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| Name | Description |
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| -------------- | ------------------------------------------------------------------------------------------- |
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| `bytes_data` | The data to load from. ~~bytes~~ |
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| _keyword-only_ | |
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| `exclude` | String names of [serialization fields](#serialization-fields) to exclude. ~~Iterable[str]~~ |
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| **RETURNS** | The `EditTreeLemmatizer` object. ~~EditTreeLemmatizer~~ |
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## EditTreeLemmatizer.labels {id="labels",tag="property"}
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The labels currently added to the component.
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<Infobox variant="warning" title="Interpretability of the labels">
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The `EditTreeLemmatizer` labels are not useful by themselves, since they are
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identifiers of edit trees.
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</Infobox>
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| Name | Description |
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| ----------- | ------------------------------------------------------ |
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| **RETURNS** | The labels added to the component. ~~Tuple[str, ...]~~ |
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## EditTreeLemmatizer.label_data {id="label_data",tag="property",version="3"}
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The labels currently added to the component and their internal meta information.
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This is the data generated by [`init labels`](/api/cli#init-labels) and used by
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[`EditTreeLemmatizer.initialize`](/api/edittreelemmatizer#initialize) to
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initialize the model with a pre-defined label set.
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> #### Example
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>
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> ```python
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> labels = lemmatizer.label_data
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> lemmatizer.initialize(lambda: [], nlp=nlp, labels=labels)
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> ```
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| Name | Description |
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| ----------- | ---------------------------------------------------------- |
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| **RETURNS** | The label data added to the component. ~~Tuple[str, ...]~~ |
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## Serialization fields {id="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 = lemmatizer.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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| `trees` | The edit trees. You usually don't want to exclude this. |
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