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Description:

pd3fflair 0.6.0.1

NB: This is a Fork
Flair's Language Models without unnecessary dependencies.
This package removed all the unnecessary dependencies if you only want to use Flair's character-based language models.
Flair listed all kind of optional requirements as hard requirments.
This made the installation tedious and bloated.
pip install pd3f-flair

A very simple framework for state-of-the-art NLP. Developed by Humboldt University of Berlin and friends.

IMPORTANT: (30.08.2020) We moved our models to a new server. Please update your Flair to the newest version!

Flair is:

A powerful NLP library. Flair allows you to apply our state-of-the-art natural language processing (NLP)
models to your text, such as named entity recognition (NER), part-of-speech tagging (PoS),
sense disambiguation and classification, with support for a rapidly growing number of languages.

A biomedical NER library. Flair has special support for biomedical data with
state-of-the-art models for biomedical NER and support for over 32 biomedical datasets.

A text embedding library. Flair has simple interfaces that allow you to use and combine different word and
document embeddings, including our proposed Flair embeddings, BERT embeddings and ELMo embeddings.

A PyTorch NLP framework. Our framework builds directly on PyTorch, making it easy to
train your own models and experiment with new approaches using Flair embeddings and classes.

Now at version 0.6!
Comparison with State-of-the-Art
Flair outperforms the previous best methods on a range of NLP tasks:

Task
Language
Dataset
Flair
Previous best

Named Entity Recognition
English
Conll-03
93.18 (F1)
92.22 (Peters et al., 2018)

Named Entity Recognition
English
Ontonotes
89.3 (F1)
86.28 (Chiu et al., 2016)

Emerging Entity Detection
English
WNUT-17
49.49 (F1)
45.55 (Aguilar et al., 2018)

Part-of-Speech tagging
English
WSJ
97.85
97.64 (Choi, 2016)

Chunking
English
Conll-2000
96.72 (F1)
96.36 (Peters et al., 2017)

Named Entity Recognition
German
Conll-03
88.27 (F1)
78.76 (Lample et al., 2016)

Named Entity Recognition
German
Germeval
84.65 (F1)
79.08 (Hänig et al, 2014)

Named Entity Recognition
Dutch
Conll-02
92.38 (F1)
81.74 (Lample et al., 2016)

Named Entity Recognition
Polish
PolEval-2018
86.6 (F1) (Borchmann et al., 2018)
85.1 (PolDeepNer)

Here's how to reproduce these numbers using Flair. You can also find detailed evaluations and discussions in our papers:

Contextual String Embeddings for Sequence Labeling.
Alan Akbik, Duncan Blythe and Roland Vollgraf.
27th International Conference on Computational Linguistics, COLING 2018.

Pooled Contextualized Embeddings for Named Entity Recognition.
Alan Akbik, Tanja Bergmann and Roland Vollgraf.
2019 Annual Conference of the North American Chapter of the Association for Computational Linguistics, NAACL 2019.

FLAIR: An Easy-to-Use Framework for State-of-the-Art NLP.
Alan Akbik, Tanja Bergmann, Duncan Blythe, Kashif Rasul, Stefan Schweter and Roland Vollgraf.
2019 Annual Conference of the North American Chapter of the Association for Computational Linguistics (Demonstrations), NAACL 2019.

Quick Start
Requirements and Installation
The project is based on PyTorch 1.1+ and Python 3.6+, because method signatures and type hints are beautiful.
If you do not have Python 3.6, install it first. Here is how for Ubuntu 16.04.
Then, in your favorite virtual environment, simply do:
pip install flair

Example Usage
Let's run named entity recognition (NER) over an example sentence. All you need to do is make a Sentence, load
a pre-trained model and use it to predict tags for the sentence:
from flair.data import Sentence
from flair.models import SequenceTagger

# make a sentence
sentence = Sentence('I love Berlin .')

# load the NER tagger
tagger = SequenceTagger.load('ner')

# run NER over sentence
tagger.predict(sentence)

Done! The Sentence now has entity annotations. Print the sentence to see what the tagger found.
print(sentence)
print('The following NER tags are found:')

# iterate over entities and print
for entity in sentence.get_spans('ner'):
print(entity)

This should print:
Sentence: "I love Berlin ." - 4 Tokens

The following NER tags are found:

Span [3]: "Berlin" [− Labels: LOC (0.9992)]

Tutorials
We provide a set of quick tutorials to get you started with the library:

Tutorial 1: Basics
Tutorial 2: Tagging your Text
Tutorial 3: Embedding Words
Tutorial 4: List of All Word Embeddings
Tutorial 5: Embedding Documents
Tutorial 6: Loading a Dataset
Tutorial 7: Training a Model
Tutorial 8: Training your own Flair Embeddings

The tutorials explain how the base NLP classes work, how you can load pre-trained models to tag your
text, how you can embed your text with different word or document embeddings, and how you can train your own
language models, sequence labeling models, and text classification models. Let us know if anything is unclear.
There is also a dedicated landing page for our biomedical NER and datasets with
installation instructions and tutorials.
There are also good third-party articles and posts that illustrate how to use Flair:

How to build a text classifier with Flair
How to build a microservice with Flair and Flask
A docker image for Flair
Great overview of Flair functionality and how to use in Colab
Visualisation tool for highlighting the extracted entities
Practical approach of State-of-the-Art Flair in Named Entity Recognition
Benchmarking NER algorithms
Training a Flair text classifier on Google Cloud Platform (GCP) and serving predictions on GCP

Citing Flair
Please cite the following paper when using Flair:
@inproceedings{akbik2018coling,
title={Contextual String Embeddings for Sequence Labeling},
author={Akbik, Alan and Blythe, Duncan and Vollgraf, Roland},
booktitle = {{COLING} 2018, 27th International Conference on Computational Linguistics},
pages = {1638--1649},
year = {2018}
}

If you use the pooled version of the Flair embeddings (PooledFlairEmbeddings), please cite:
@inproceedings{akbik2019naacl,
title={Pooled Contextualized Embeddings for Named Entity Recognition},
author={Akbik, Alan and Bergmann, Tanja and Vollgraf, Roland},
booktitle = {{NAACL} 2019, 2019 Annual Conference of the North American Chapter of the Association for Computational Linguistics},
pages = {724–728},
year = {2019}
}

Contact
Please email your questions or comments to Alan Akbik.
Contributing
Thanks for your interest in contributing! There are many ways to get involved;
start with our contributor guidelines and then
check these open issues for specific tasks.
For contributors looking to get deeper into the API we suggest cloning the repository and checking out the unit
tests for examples of how to call methods. Nearly all classes and methods are documented, so finding your way around
the code should hopefully be easy.
Running unit tests locally
You need Pipenv for this:
pipenv install --dev && pipenv shell
pytest tests/

To run integration tests execute:
pytest --runintegration tests/

The integration tests will train small models.
Afterwards, the trained model will be loaded for prediction.
To also run slow tests, such as loading and using the embeddings provided by flair, you should execute:
pytest --runslow tests/

License
The MIT License (MIT)
Flair is licensed under the following MIT license: The MIT License (MIT) Copyright © 2018 Zalando SE, https://tech.zalando.com
Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the “Software”), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED “AS IS”, WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.