mirror of https://github.com/explosion/spaCy.git
300 lines
10 KiB
Markdown
300 lines
10 KiB
Markdown
---
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title: SpanGroup
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tag: class
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source: spacy/tokens/span_group.pyx
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new: 3
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---
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A group of arbitrary, potentially overlapping [`Span`](/api/span) objects that
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all belong to the same [`Doc`](/api/doc) object. The group can be named, and you
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can attach additional attributes to it. Span groups are generally accessed via
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the [`Doc.spans`](/api/doc#spans) attribute, which will convert lists of spans
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into a `SpanGroup` object for you automatically on assignment. `SpanGroup`
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objects behave similar to `list`s, so you can append `Span` objects to them or
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access a member at a given index.
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## SpanGroup.\_\_init\_\_ {#init tag="method"}
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Create a `SpanGroup`.
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> #### Example
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>
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> ```python
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> doc = nlp("Their goi ng home")
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> spans = [doc[0:1], doc[1:3]]
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>
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> # Construction 1
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> from spacy.tokens import SpanGroup
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>
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> group = SpanGroup(doc, name="errors", spans=spans, attrs={"annotator": "matt"})
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> doc.spans["errors"] = group
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>
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> # Construction 2
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> doc.spans["errors"] = spans
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> assert isinstance(doc.spans["errors"], SpanGroup)
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> ```
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| Name | Description |
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| -------------- | ---------------------------------------------------------------------------------------------------------------------------------------------------- |
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| `doc` | The document the span group belongs to. ~~Doc~~ |
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| _keyword-only_ | |
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| `name` | The name of the span group. If the span group is created automatically on assignment to `doc.spans`, the key name is used. Defaults to `""`. ~~str~~ |
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| `attrs` | Optional JSON-serializable attributes to attach to the span group. ~~Dict[str, Any]~~ |
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| `spans` | The spans to add to the span group. ~~Iterable[Span]~~ |
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## SpanGroup.doc {#doc tag="property"}
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The [`Doc`](/api/doc) object the span group is referring to.
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<Infobox title="SpanGroup and Doc lifecycle" variant="warning">
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When a `Doc` object is garbage collected, any related `SpanGroup` object won't
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be functional anymore, as these objects use a `weakref` to refer to the
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document. An error will be raised as the internal `doc` object will be `None`.
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To avoid this, make sure that the original `Doc` objects are still available in
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the scope of your function.
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</Infobox>
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> #### Example
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>
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> ```python
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> doc = nlp("Their goi ng home")
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> doc.spans["errors"] = [doc[0:1], doc[1:3]]
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> assert doc.spans["errors"].doc == doc
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> ```
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| Name | Description |
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| ----------- | ------------------------------- |
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| **RETURNS** | The reference document. ~~Doc~~ |
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## SpanGroup.has_overlap {#has_overlap tag="property"}
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Check whether the span group contains overlapping spans.
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> #### Example
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>
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> ```python
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> doc = nlp("Their goi ng home")
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> doc.spans["errors"] = [doc[0:1], doc[1:3]]
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> assert not doc.spans["errors"].has_overlap
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> doc.spans["errors"].append(doc[2:4])
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> assert doc.spans["errors"].has_overlap
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> ```
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| Name | Description |
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| ----------- | -------------------------------------------------- |
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| **RETURNS** | Whether the span group contains overlaps. ~~bool~~ |
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## SpanGroup.\_\_len\_\_ {#len tag="method"}
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Get the number of spans in the group.
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> #### Example
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>
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> ```python
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> doc = nlp("Their goi ng home")
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> doc.spans["errors"] = [doc[0:1], doc[1:3]]
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> assert len(doc.spans["errors"]) == 2
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> ```
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| Name | Description |
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| ----------- | ----------------------------------------- |
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| **RETURNS** | The number of spans in the group. ~~int~~ |
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## SpanGroup.\_\_getitem\_\_ {#getitem tag="method"}
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Get a span from the group. Note that a copy of the span is returned, so if any
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changes are made to this span, they are not reflected in the corresponding
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member of the span group. The item or group will need to be reassigned for
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changes to be reflected in the span group.
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> #### Example
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>
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> ```python
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> doc = nlp("Their goi ng home")
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> doc.spans["errors"] = [doc[0:1], doc[1:3]]
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> span = doc.spans["errors"][1]
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> assert span.text == "goi ng"
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> span.label_ = 'LABEL'
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> assert doc.spans["errors"][1].label_ != 'LABEL' # The span within the group was not updated
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> ```
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| Name | Description |
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| ----------- | ------------------------------------- |
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| `i` | The item index. ~~int~~ |
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| **RETURNS** | The span at the given index. ~~Span~~ |
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## SpanGroup.\_\_setitem\_\_ {#setitem tag="method", new="3.3"}
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Set a span in the span group.
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> #### Example
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>
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> ```python
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> doc = nlp("Their goi ng home")
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> doc.spans["errors"] = [doc[0:1], doc[1:3]]
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> span = doc[0:2]
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> doc.spans["errors"][0] = span
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> assert doc.spans["errors"][0].text == "Their goi"
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> ```
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| Name | Description |
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| ------ | ----------------------- |
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| `i` | The item index. ~~int~~ |
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| `span` | The new value. ~~Span~~ |
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## SpanGroup.\_\_delitem\_\_ {#delitem tag="method", new="3.3"}
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Delete a span from the span group.
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> #### Example
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>
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> ```python
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> doc = nlp("Their goi ng home")
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> doc.spans["errors"] = [doc[0:1], doc[1:3]]
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> del doc.spans[0]
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> assert len(doc.spans["errors"]) == 1
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> ```
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| Name | Description |
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| ---- | ----------------------- |
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| `i` | The item index. ~~int~~ |
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## SpanGroup.\_\_add\_\_ {#add tag="method", new="3.3"}
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Concatenate the current span group with another span group and return the result
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in a new span group. Any `attrs` from the first span group will have precedence
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over `attrs` in the second.
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> #### Example
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>
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> ```python
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> doc = nlp("Their goi ng home")
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> doc.spans["errors"] = [doc[0:1], doc[1:3]]
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> doc.spans["other"] = [doc[0:2], doc[2:4]]
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> span_group = doc.spans["errors"] + doc.spans["other"]
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> assert len(span_group) == 4
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> ```
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| Name | Description |
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| ----------- | ---------------------------------------------------------------------------- |
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| `other` | The span group or spans to concatenate. ~~Union[SpanGroup, Iterable[Span]]~~ |
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| **RETURNS** | The new span group. ~~SpanGroup~~ |
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## SpanGroup.\_\_iadd\_\_ {#iadd tag="method", new="3.3"}
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Append an iterable of spans or the content of a span group to the current span
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group. Any `attrs` in the other span group will be added for keys that are not
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already present in the current span group.
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> #### Example
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>
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> ```python
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> doc = nlp("Their goi ng home")
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> doc.spans["errors"] = [doc[0:1], doc[1:3]]
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> doc.spans["errors"] += [doc[3:4], doc[2:3]]
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> assert len(doc.spans["errors"]) == 4
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> ```
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| Name | Description |
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| ----------- | ----------------------------------------------------------------------- |
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| `other` | The span group or spans to append. ~~Union[SpanGroup, Iterable[Span]]~~ |
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| **RETURNS** | The span group. ~~SpanGroup~~ |
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## SpanGroup.append {#append tag="method"}
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Add a [`Span`](/api/span) object to the group. The span must refer to the same
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[`Doc`](/api/doc) object as the span group.
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> #### Example
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>
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> ```python
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> doc = nlp("Their goi ng home")
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> doc.spans["errors"] = [doc[0:1]]
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> doc.spans["errors"].append(doc[1:3])
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> assert len(doc.spans["errors"]) == 2
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> ```
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| Name | Description |
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| ------ | ---------------------------- |
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| `span` | The span to append. ~~Span~~ |
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## SpanGroup.extend {#extend tag="method"}
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Add multiple [`Span`](/api/span) objects or contents of another `SpanGroup` to
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the group. All spans must refer to the same [`Doc`](/api/doc) object as the span
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group.
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> #### Example
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>
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> ```python
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> doc = nlp("Their goi ng home")
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> doc.spans["errors"] = []
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> doc.spans["errors"].extend([doc[1:3], doc[0:1]])
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> assert len(doc.spans["errors"]) == 2
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> span_group = SpanGroup(doc, spans=[doc[1:4], doc[0:3]])
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> doc.spans["errors"].extend(span_group)
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> ```
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| Name | Description |
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| ------- | -------------------------------------------------------- |
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| `spans` | The spans to add. ~~Union[SpanGroup, Iterable["Span"]]~~ |
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## SpanGroup.copy {#copy tag="method", new="3.3"}
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Return a copy of the span group.
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> #### Example
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>
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> ```python
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> from spacy.tokens import SpanGroup
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>
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> doc = nlp("Their goi ng home")
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> doc.spans["errors"] = [doc[1:3], doc[0:3]]
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> new_group = doc.spans["errors"].copy()
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> ```
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| Name | Description |
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| ----------- | -------------------------------------------------------------------------------------------------- |
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| `doc` | The document to which the copy is bound. Defaults to `None` for the current doc. ~~Optional[Doc]~~ |
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| **RETURNS** | A copy of the `SpanGroup` object. ~~SpanGroup~~ |
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## SpanGroup.to_bytes {#to_bytes tag="method"}
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Serialize the span group to a bytestring.
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> #### Example
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>
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> ```python
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> doc = nlp("Their goi ng home")
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> doc.spans["errors"] = [doc[0:1], doc[1:3]]
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> group_bytes = doc.spans["errors"].to_bytes()
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> ```
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| Name | Description |
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| ----------- | ------------------------------------- |
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| **RETURNS** | The serialized `SpanGroup`. ~~bytes~~ |
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## SpanGroup.from_bytes {#from_bytes tag="method"}
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Load the span group from a bytestring. Modifies the object in place and returns
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it.
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> #### Example
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>
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> ```python
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> from spacy.tokens import SpanGroup
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>
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> doc = nlp("Their goi ng home")
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> doc.spans["errors"] = [doc[0:1], doc[1:3]]
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> group_bytes = doc.spans["errors"].to_bytes()
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> new_group = SpanGroup()
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> new_group.from_bytes(group_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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| **RETURNS** | The `SpanGroup` object. ~~SpanGroup~~ |
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