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208 lines
12 KiB
Markdown
208 lines
12 KiB
Markdown
---
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title: Scorer
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teaser: Compute evaluation scores
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tag: class
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source: spacy/scorer.py
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---
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The `Scorer` computes evaluation scores. It's typically created by
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[`Language.evaluate`](/api/language#evaluate). In addition, the `Scorer`
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provides a number of evaluation methods for evaluating [`Token`](/api/token) and
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[`Doc`](/api/doc) attributes.
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## Scorer.\_\_init\_\_ {#init tag="method"}
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Create a new `Scorer`.
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> #### Example
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>
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> ```python
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> from spacy.scorer import Scorer
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>
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> # Default scoring pipeline
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> scorer = Scorer()
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>
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> # Provided scoring pipeline
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> nlp = spacy.load("en_core_web_sm")
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> scorer = Scorer(nlp)
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> ```
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| Name | Type | Description |
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| ----- | -------- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
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| `nlp` | Language | The pipeline to use for scoring, where each pipeline component may provide a scoring method. If none is provided, then a default pipeline for the multi-language code `xx` is constructed containing: `senter`, `tagger`, `morphologizer`, `parser`, `ner`, `textcat`. |
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## Scorer.score {#score tag="method"}
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Calculate the scores for a list of [`Example`](/api/example) objects using the
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scoring methods provided by the components in the pipeline.
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The returned `Dict` contains the scores provided by the individual pipeline
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components. For the scoring methods provided by the `Scorer` and use by the core
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pipeline components, the individual score names start with the `Token` or `Doc`
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attribute being scored:
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- `token_acc`, `token_p`, `token_r`, `token_f`,
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- `sents_p`, `sents_r`, `sents_f`
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- `tag_acc`, `pos_acc`, `morph_acc`, `morph_per_feat`, `lemma_acc`
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- `dep_uas`, `dep_las`, `dep_las_per_type`
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- `ents_p`, `ents_r` `ents_f`, `ents_per_type`
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- `textcat_macro_auc`, `textcat_macro_f`
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> #### Example
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>
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> ```python
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> scorer = Scorer()
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> scores = scorer.score(examples)
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> ```
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| Name | Type | Description |
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| ----------- | ------------------- | --------------------------------------------------------------------------------------------- |
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| `examples` | `Iterable[Example]` | The `Example` objects holding both the predictions and the correct gold-standard annotations. |
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| **RETURNS** | `Dict` | A dictionary of scores. |
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## Scorer.score_tokenization {#score_tokenization tag="staticmethod" new="3"}
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Scores the tokenization:
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- `token_acc`: number of correct tokens / number of gold tokens
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- `token_p`, `token_r`, `token_f`: precision, recall and F-score for token
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character spans
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> #### Example
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>
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> ```python
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> scores = Scorer.score_tokenization(examples)
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> ```
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| Name | Type | Description |
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| ----------- | ------------------- | --------------------------------------------------------------------------------------------- |
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| `examples` | `Iterable[Example]` | The `Example` objects holding both the predictions and the correct gold-standard annotations. |
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| **RETURNS** | `Dict` | A dictionary containing the scores `token_acc`, `token_p`, `token_r`, `token_f`. |
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## Scorer.score_token_attr {#score_token_attr tag="staticmethod" new="3"}
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Scores a single token attribute.
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> #### Example
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>
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> ```python
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> scores = Scorer.score_token_attr(examples, "pos")
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> print(scores["pos_acc"])
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> ```
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| Name | Type | Description |
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| -------------- | ------------------- | ----------------------------------------------------------------------------------------------------------------------------- |
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| `examples` | `Iterable[Example]` | The `Example` objects holding both the predictions and the correct gold-standard annotations. |
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| `attr` | `str` | The attribute to score. |
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| _keyword-only_ | | |
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| `getter` | `Callable` | Defaults to `getattr`. If provided, `getter(token, attr)` should return the value of the attribute for an individual `Token`. |
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| **RETURNS** | `Dict[str, float]` | A dictionary containing the score `{attr}_acc`. |
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## Scorer.score_token_attr_per_feat {#score_token_attr_per_feat tag="staticmethod" new="3"}
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Scores a single token attribute per feature for a token attribute in
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[UFEATS](https://universaldependencies.org/format.html#morphological-annotation)
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format.
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> #### Example
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>
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> ```python
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> scores = Scorer.score_token_attr_per_feat(examples, "morph")
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> print(scores["morph_per_feat"])
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> ```
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| Name | Type | Description |
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| -------------- | ------------------- | ----------------------------------------------------------------------------------------------------------------------------- |
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| `examples` | `Iterable[Example]` | The `Example` objects holding both the predictions and the correct gold-standard annotations. |
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| `attr` | `str` | The attribute to score. |
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| _keyword-only_ | | |
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| `getter` | `Callable` | Defaults to `getattr`. If provided, `getter(token, attr)` should return the value of the attribute for an individual `Token`. |
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| **RETURNS** | `Dict` | A dictionary containing the per-feature PRF scores under the key `{attr}_per_feat`. |
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## Scorer.score_spans {#score_spans tag="staticmethod" new="3"}
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Returns PRF scores for labeled or unlabeled spans.
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> #### Example
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>
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> ```python
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> scores = Scorer.score_spans(examples, "ents")
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> print(scores["ents_f"])
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> ```
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| Name | Type | Description |
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| -------------- | ------------------- | --------------------------------------------------------------------------------------------------------------------------------------------- |
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| `examples` | `Iterable[Example]` | The `Example` objects holding both the predictions and the correct gold-standard annotations. |
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| `attr` | `str` | The attribute to score. |
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| _keyword-only_ | | |
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| `getter` | `Callable` | Defaults to `getattr`. If provided, `getter(doc, attr)` should return the `Span` objects for an individual `Doc`. |
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| **RETURNS** | `Dict` | A dictionary containing the PRF scores under the keys `{attr}_p`, `{attr}_r`, `{attr}_f` and the per-type PRF scores under `{attr}_per_type`. |
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## Scorer.score_deps {#score_deps tag="staticmethod" new="3"}
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Calculate the UAS, LAS, and LAS per type scores for dependency parses.
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> #### Example
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>
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> ```python
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> def dep_getter(token, attr):
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> dep = getattr(token, attr)
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> dep = token.vocab.strings.as_string(dep).lower()
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> return dep
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>
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> scores = Scorer.score_deps(
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> examples,
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> "dep",
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> getter=dep_getter,
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> ignore_labels=("p", "punct")
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> )
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> print(scores["dep_uas"], scores["dep_las"])
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> ```
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| Name | Type | Description |
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| --------------- | ------------------- | ----------------------------------------------------------------------------------------------------------------------------- |
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| `examples` | `Iterable[Example]` | The `Example` objects holding both the predictions and the correct gold-standard annotations. |
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| `attr` | `str` | The attribute containing the dependency label. |
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| _keyword-only_ | | |
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| `getter` | `Callable` | Defaults to `getattr`. If provided, `getter(token, attr)` should return the value of the attribute for an individual `Token`. |
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| `head_attr` | `str` | The attribute containing the head token. |
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| `head_getter` | `callable` | Defaults to `getattr`. If provided, `head_getter(token, attr)` should return the head for an individual `Token`. |
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| `ignore_labels` | `Tuple` | Labels to ignore while scoring (e.g., `punct`). |
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| **RETURNS** | `Dict` | A dictionary containing the scores: `{attr}_uas`, `{attr}_las`, and `{attr}_las_per_type`. |
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## Scorer.score_cats {#score_cats tag="staticmethod" new="3"}
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Calculate PRF and ROC AUC scores for a doc-level attribute that is a dict
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containing scores for each label like `Doc.cats`. The reported overall score
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depends on the scorer settings:
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1. **all:** `{attr}_score` (one of `{attr}_f` / `{attr}_macro_f` /
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`{attr}_macro_auc`), `{attr}_score_desc` (text description of the overall
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score), `{attr}_f_per_type`, `{attr}_auc_per_type`
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2. **binary exclusive with positive label:** `{attr}_p`, `{attr}_r`, `{attr}_f`
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3. **3+ exclusive classes**, macro-averaged F-score: `{attr}_macro_f`;
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4. **multilabel**, macro-averaged AUC: `{attr}_macro_auc`
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> #### Example
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>
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> ```python
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> labels = ["LABEL_A", "LABEL_B", "LABEL_C"]
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> scores = Scorer.score_cats(
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> examples,
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> "cats",
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> labels=labels
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> )
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> print(scores["cats_macro_auc"])
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> ```
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| Name | Type | Description |
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| ---------------- | ------------------- | ------------------------------------------------------------------------------------------------------- |
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| `examples` | `Iterable[Example]` | The `Example` objects holding both the predictions and the correct gold-standard annotations. |
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| `attr` | `str` | The attribute to score. |
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| _keyword-only_ | | |
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| `getter` | `Callable` | Defaults to `getattr`. If provided, `getter(doc, attr)` should return the cats for an individual `Doc`. |
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| labels | `Iterable[str]` | The set of possible labels. Defaults to `[]`. |
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| `multi_label` | `bool` | Whether the attribute allows multiple labels. Defaults to `True`. |
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| `positive_label` | `str` | The positive label for a binary task with exclusive classes. Defaults to `None`. |
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| **RETURNS** | `Dict` | A dictionary containing the scores, with inapplicable scores as `None`. |
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