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title: seqeval
emoji: 🤗
colorFrom: blue
colorTo: red
sdk: gradio
sdk_version: 3.0.2
app_file: app.py
pinned: false
tags:
- evaluate
- metric
description: >-
seqeval is a Python framework for sequence labeling evaluation. seqeval can
evaluate the performance of chunking tasks such as named-entity recognition,
part-of-speech tagging, semantic role labeling and so on.
This is well-tested by using the Perl script conlleval, which can be used for
measuring the performance of a system that has processed the CoNLL-2000 shared
task data.
seqeval supports following formats: IOB1 IOB2 IOE1 IOE2 IOBES
See the [README.md] file at https://github.com/chakki-works/seqeval for more
information.
Metric Card for seqeval
Metric description
seqeval is a Python framework for sequence labeling evaluation. seqeval can evaluate the performance of chunking tasks such as named-entity recognition, part-of-speech tagging, semantic role labeling and so on.
How to use
Seqeval produces labelling scores along with its sufficient statistics from a source against one or more references.
It takes two mandatory arguments:
predictions: a list of lists of predicted labels, i.e. estimated targets as returned by a tagger.
references: a list of lists of reference labels, i.e. the ground truth/target values.
It can also take several optional arguments:
suffix (boolean): True if the IOB tag is a suffix (after type) instead of a prefix (before type), False otherwise. The default value is False, i.e. the IOB tag is a prefix (before type).
scheme: the target tagging scheme, which can be one of [IOB1, IOB2, IOE1, IOE2, IOBES, BILOU]. The default value is None.
mode: whether to count correct entity labels with incorrect I/B tags as true positives or not. If you want to only count exact matches, pass mode="strict" and a specific scheme value. The default is None.
sample_weight: An array-like of shape (n_samples,) that provides weights for individual samples. The default is None.
zero_division: Which value to substitute as a metric value when encountering zero division. Should be one of [0,1,"warn"]. "warn" acts as 0, but the warning is raised.
>>> seqeval = evaluate.load('seqeval')
>>> predictions = [['O', 'O', 'B-MISC', 'I-MISC', 'I-MISC', 'I-MISC', 'O'], ['B-PER', 'I-PER', 'O']]
>>> references = [['O', 'O', 'O', 'B-MISC', 'I-MISC', 'I-MISC', 'O'], ['B-PER', 'I-PER', 'O']]
>>> results = seqeval.compute(predictions=predictions, references=references)
Output values
This metric returns a dictionary with a summary of scores for overall and per type:
Overall:
accuracy: the average accuracy, on a scale between 0.0 and 1.0.
precision: the average precision, on a scale between 0.0 and 1.0.
recall: the average recall, on a scale between 0.0 and 1.0.
f1: the average F1 score, which is the harmonic mean of the precision and recall. It also has a scale of 0.0 to 1.0.
Per type (e.g. MISC, PER, LOC,...):
precision: the average precision, on a scale between 0.0 and 1.0.
recall: the average recall, on a scale between 0.0 and 1.0.
f1: the average F1 score, on a scale between 0.0 and 1.0.
Values from popular papers
The 1995 "Text Chunking using Transformation-Based Learning" paper reported a baseline recall of 81.9% and a precision of 78.2% using non Deep Learning-based methods.
More recently, seqeval continues being used for reporting performance on tasks such as named entity detection and information extraction.
Examples
Maximal values (full match) :
>>> seqeval = evaluate.load('seqeval')
>>> predictions = [['O', 'O', 'B-MISC', 'I-MISC', 'I-MISC', 'I-MISC', 'O'], ['B-PER', 'I-PER', 'O']]
>>> references = [['O', 'O', 'B-MISC', 'I-MISC', 'I-MISC', 'I-MISC', 'O'], ['B-PER', 'I-PER', 'O']]
>>> results = seqeval.compute(predictions=predictions, references=references)
>>> print(results)
{'MISC': {'precision': 1.0, 'recall': 1.0, 'f1': 1.0, 'number': 1}, 'PER': {'precision': 1.0, 'recall': 1.0, 'f1': 1.0, 'number': 1}, 'overall_precision': 1.0, 'overall_recall': 1.0, 'overall_f1': 1.0, 'overall_accuracy': 1.0}
Minimal values (no match):
>>> seqeval = evaluate.load('seqeval')
>>> predictions = [['O', 'B-MISC', 'I-MISC'], ['B-PER', 'I-PER', 'O']]
>>> references = [['B-MISC', 'O', 'O'], ['I-PER', '0', 'I-PER']]
>>> results = seqeval.compute(predictions=predictions, references=references)
>>> print(results)
{'MISC': {'precision': 0.0, 'recall': 0.0, 'f1': 0.0, 'number': 1}, 'PER': {'precision': 0.0, 'recall': 0.0, 'f1': 0.0, 'number': 2}, '_': {'precision': 0.0, 'recall': 0.0, 'f1': 0.0, 'number': 1}, 'overall_precision': 0.0, 'overall_recall': 0.0, 'overall_f1': 0.0, 'overall_accuracy': 0.0}
Partial match:
>>> seqeval = evaluate.load('seqeval')
>>> predictions = [['O', 'O', 'B-MISC', 'I-MISC', 'I-MISC', 'I-MISC', 'O'], ['B-PER', 'I-PER', 'O']]
>>> references = [['O', 'O', 'O', 'B-MISC', 'I-MISC', 'I-MISC', 'O'], ['B-PER', 'I-PER', 'O']]
>>> results = seqeval.compute(predictions=predictions, references=references)
>>> print(results)
{'MISC': {'precision': 0.0, 'recall': 0.0, 'f1': 0.0, 'number': 1}, 'PER': {'precision': 1.0, 'recall': 1.0, 'f1': 1.0, 'number': 1}, 'overall_precision': 0.5, 'overall_recall': 0.5, 'overall_f1': 0.5, 'overall_accuracy': 0.8}
Limitations and bias
seqeval supports following IOB formats (short for inside, outside, beginning) : IOB1, IOB2, IOE1, IOE2, IOBES, IOBES (only in strict mode) and BILOU (only in strict mode).
For more information about IOB formats, refer to the Wikipedia page and the description of the CoNLL-2000 shared task.
Citation
@inproceedings{ramshaw-marcus-1995-text,
title = "Text Chunking using Transformation-Based Learning",
author = "Ramshaw, Lance and
Marcus, Mitch",
booktitle = "Third Workshop on Very Large Corpora",
year = "1995",
url = "https://www.aclweb.org/anthology/W95-0107",
}
@misc{seqeval,
title={{seqeval}: A Python framework for sequence labeling evaluation},
url={https://github.com/chakki-works/seqeval},
note={Software available from https://github.com/chakki-works/seqeval},
author={Hiroki Nakayama},
year={2018},
}