Module gatenlp.lib_stanza
Support for using stanford stanza (see https://stanfordnlp.github.io/stanza/): convert from stanford Stanza output to gatenlp documents and annotations.
Expand source code
"""
Support for using stanford stanza (see https://stanfordnlp.github.io/stanza/):
convert from stanford Stanza output to gatenlp documents and annotations.
"""
from gatenlp import Document
from gatenlp import logger
from gatenlp.processing.annotator import Annotator
import stanza
class AnnStanza(Annotator):
""" """
def __init__(
self,
pipeline=None,
outsetname="",
token_type="Token",
sentence_type="Sentence",
add_entities=True,
ent_prefix=None,
**kwargs,
):
"""
Create a processing resources for running a stanza pipeline on documents.
:param pipeline: if this is specified, use a pre-configured pipeline
:param outsetname: the annotation set name where to put the annotations
:param token_type: the annotation type for the token annotations
:param sentence_type: the annotation type for the sentence annotations
:param add_entities: if true, add entity annotations
:param ent_prefix: the prefix to add to all entity annotation types
:param kwargs: if no preconfigured pipeline is specified, pass these arguments to
the stanza.Pipeline() constructor see https://stanfordnlp.github.io/stanza/pipeline.html#pipeline
"""
self.outsetname = outsetname
self.token_type = token_type
self.sentence_type = sentence_type
self.add_entities = add_entities
self.ent_prefix = ent_prefix
[
kwargs.pop(a, None)
for a in ["token_type", "sentence_type", "add_entities", "ent_prefix"]
]
if pipeline:
self.pipeline = pipeline
else:
self.pipeline = stanza.Pipeline(**kwargs)
def __call__(self, doc, **kwargs):
stanza_doc = self.pipeline(doc.text)
stanza2gatenlp(
stanza_doc,
doc,
setname=self.outsetname,
token_type=self.token_type,
sentence_type=self.sentence_type,
add_entities=self.add_entities,
ent_prefix=self.ent_prefix,
)
return doc
def apply_stanza(nlp, gatenlpdoc, setname=""):
"""Run the stanford stanza pipeline on the gatenlp document and transfer the annotations.
This modifies the gatenlp document in place.
Args:
nlp: StanfordNLP pipeline
gatenlpdoc: gatenlp document
setname: set to use (Default value = "")
Returns:
"""
doc = nlp(gatenlpdoc.text)
return stanza2gatenlp(doc, gatenlpdoc=gatenlpdoc, setname=setname)
def tok2tok(tok):
"""Create a copy of a Stanza token, prepared for creating an annotation: this is a dict that has
start, end and id keys and everything else in a nested dict "fm".
Args:
tok: original stanza token
Returns:
what we use to create a Token annotation
"""
newtok = {}
newtok["id"] = tok["id"]
fm = {}
fm.update(tok)
newtok["fm"] = fm
feats = fm.get("feats")
if feats is not None:
del fm["feats"]
for feat in feats.split("|"):
k, v = feat.split("=")
fm[k] = v
misc = fm.get("misc")
if misc is not None:
del fm["misc"]
msettings = misc.split("|")
ostart = None
oend = None
othersettings = []
for ms in msettings:
k, v = ms.split("=")
if k == "start_char":
ostart = int(v)
elif k == "end_char":
oend = int(v)
else:
othersettings.append(ms)
if ostart is not None:
newtok["start"] = ostart
if oend is not None:
newtok["end"] = oend
if othersettings:
for os in othersettings:
k, v = ms.split("=")
fm[k] = v
return newtok
def stanza2gatenlp(
stanzadoc,
gatenlpdoc=None,
setname="",
token_type="Token",
sentence_type="Sentence",
add_entities=True,
ent_prefix=None,
):
"""
Convert a Stanford Stanza document to a gatenlp document. If a gatenlp document is already
provided, add the annotations from the Stanford Stanza document to it. In this case the
original gatenlpdoc is used and gets modified.
Args:
stanzadoc: a Stanford Stanza document
gatenlpdoc: if None, a new gatenlp document is created otherwise this
document is added to. (Default value = None)
setname: the annotation set name to which the annotations get added, empty string
for the default annotation set.
token_type: the annotation type to use for tokens, if needed (Default value = "Token")
sentence_type: the annotation type to use for sentence anntoations (Default value = "Sentence")
add_entities: if True, add any entities as well (Default value = True)
ent_prefix: if None, use the original entity type as annotation type, otherwise add the given string
to the annotation type as a prefix. (Default value = None)
Returns:
the new or modified gatenlp document
"""
if gatenlpdoc is None:
retdoc = Document(stanzadoc.text)
else:
retdoc = gatenlpdoc
toki2annid = {}
annset = retdoc.annset(setname)
# stanford nlp processes text in sentence chunks, so we do everything per sentence
notmatchedidx = 0
for sent in stanzadoc.sentences:
# go through the tokens: in stanza, each token is a list of dicts, normally there is one dict
# which also has the offset information in "misc", but for multiword tokens, there seems to be
# one "header" dict for the range of words which has the offset info and NER label and then
# one additional element per word which has all the rest.
# For our purposes we create a list of dicts where for normal tokens we just copy the element, but for
# multiword tokens we copy over something that has fake offsets and all the features
newtokens = []
for t in sent.tokens:
t = t.to_dict()
if len(t) == 1:
newtokens.append(tok2tok(t[0]))
else:
tokinfo = tok2tok(t[0])
words = t[1:]
fm = tokinfo.get("fm")
ner = fm.get("ner")
text = fm.get("text")
start = tokinfo["start"]
end = tokinfo["end"]
for i, w in enumerate(words):
tok = tok2tok(w)
tok["fm"]["ner"] = ner
tok["fm"]["token_text"] = text
os = min(start + i, end - 1)
tok["start"] = os
if i == len(words) - 1:
tok["end"] = end
else:
tok["end"] = os + 1
newtokens.append(tok)
# print(f"\n!!!!!!DEBUG: newtokens={newtokens}")
# now go through the new token list and create annotations
idx2annid = {} # map stanza word id to annotation id
starts = []
ends = []
for t in newtokens:
start = t["start"]
end = t["end"]
stanzaid = t["id"]
starts.append(start)
ends.append(end)
annid = annset.add(start, end, token_type, features=t["fm"]).id
idx2annid[str(stanzaid)] = annid
# print(f"\n!!!!!!DEBUG: idx2annid={idx2annid}")
# create a sentence annotation from beginning of first word to end of last
sentid = annset.add(starts[0], ends[-1], sentence_type).id
# now replace the head index with the corresponding annid, the head index "0" is
# mapped to the sentence annotation
idx2annid["0"] = sentid
for annid in list(idx2annid.values()):
ann = annset.get(annid)
hd = ann.features.get("head")
if hd is not None:
hd = str(hd)
headId = idx2annid.get(hd)
if headId is None:
logger.error(
f"Could not find head id: {hd} for {ann} in document {gatenlpdoc.name}"
)
else:
ann.features["head"] = idx2annid[hd]
# add the entities
if add_entities:
for e in stanzadoc.entities:
if ent_prefix:
anntype = ent_prefix + e.type
else:
anntype = e.type
annset.add(e.start_char, e.end_char, anntype)
return retdoc
Functions
def apply_stanza(nlp, gatenlpdoc, setname='')
-
Run the stanford stanza pipeline on the gatenlp document and transfer the annotations. This modifies the gatenlp document in place.
Args
nlp
- StanfordNLP pipeline
gatenlpdoc
- gatenlp document
setname
- set to use (Default value = "")
Returns:
def stanza2gatenlp(stanzadoc, gatenlpdoc=None, setname='', token_type='Token', sentence_type='Sentence', add_entities=True, ent_prefix=None)
-
Convert a Stanford Stanza document to a gatenlp document. If a gatenlp document is already provided, add the annotations from the Stanford Stanza document to it. In this case the original gatenlpdoc is used and gets modified.
Args
stanzadoc
- a Stanford Stanza document
gatenlpdoc
- if None, a new gatenlp document is created otherwise this document is added to. (Default value = None)
setname
- the annotation set name to which the annotations get added, empty string for the default annotation set.
token_type
- the annotation type to use for tokens, if needed (Default value = "Token")
sentence_type
- the annotation type to use for sentence anntoations (Default value = "Sentence")
add_entities
- if True, add any entities as well (Default value = True)
ent_prefix
- if None, use the original entity type as annotation type, otherwise add the given string
to the annotation type as a prefix. (Default value = None)
Returns
the new or modified gatenlp document
def tok2tok(tok)
-
Create a copy of a Stanza token, prepared for creating an annotation: this is a dict that has start, end and id keys and everything else in a nested dict "fm".
Args
tok
- original stanza token
Returns
what we use to create a Token annotation
Classes
class AnnStanza (pipeline=None, outsetname='', token_type='Token', sentence_type='Sentence', add_entities=True, ent_prefix=None, **kwargs)
-
Create a processing resources for running a stanza pipeline on documents.
:param pipeline: if this is specified, use a pre-configured pipeline :param outsetname: the annotation set name where to put the annotations :param token_type: the annotation type for the token annotations :param sentence_type: the annotation type for the sentence annotations :param add_entities: if true, add entity annotations :param ent_prefix: the prefix to add to all entity annotation types :param kwargs: if no preconfigured pipeline is specified, pass these arguments to the stanza.Pipeline() constructor see https://stanfordnlp.github.io/stanza/pipeline.html#pipeline
Expand source code
class AnnStanza(Annotator): """ """ def __init__( self, pipeline=None, outsetname="", token_type="Token", sentence_type="Sentence", add_entities=True, ent_prefix=None, **kwargs, ): """ Create a processing resources for running a stanza pipeline on documents. :param pipeline: if this is specified, use a pre-configured pipeline :param outsetname: the annotation set name where to put the annotations :param token_type: the annotation type for the token annotations :param sentence_type: the annotation type for the sentence annotations :param add_entities: if true, add entity annotations :param ent_prefix: the prefix to add to all entity annotation types :param kwargs: if no preconfigured pipeline is specified, pass these arguments to the stanza.Pipeline() constructor see https://stanfordnlp.github.io/stanza/pipeline.html#pipeline """ self.outsetname = outsetname self.token_type = token_type self.sentence_type = sentence_type self.add_entities = add_entities self.ent_prefix = ent_prefix [ kwargs.pop(a, None) for a in ["token_type", "sentence_type", "add_entities", "ent_prefix"] ] if pipeline: self.pipeline = pipeline else: self.pipeline = stanza.Pipeline(**kwargs) def __call__(self, doc, **kwargs): stanza_doc = self.pipeline(doc.text) stanza2gatenlp( stanza_doc, doc, setname=self.outsetname, token_type=self.token_type, sentence_type=self.sentence_type, add_entities=self.add_entities, ent_prefix=self.ent_prefix, ) return doc
Ancestors
- Annotator
- abc.ABC
Inherited members