Crowd-Kit is a powerful Python library that implements commonly-used aggregation methods for crowdsourced annotation and offers the relevant metrics and datasets. We strive to implement functionality that simplifies working with crowdsourced data.

Currently, Crowd-Kit contains:

• implementations of commonly-used aggregation methods for categorical, pairwise, textual, and segmentation responses;
• metrics of uncertainty, consistency, and agreement with aggregate;
• loaders for popular crowdsourced datasets.

Also, the learning subpackage contains PyTorch implementations of deep learning from crowds methods and advanced aggregation algorithms.

To install Crowd-Kit, run the following command: pip install crowd-kit. If you also want to use the learning subpackage, type pip install crowd-kit[learning].

If you are interested in contributing to Crowd-Kit, use Pipenv to install the library with its dependencies: pipenv install --dev. We use pytest for testing.

This example shows how to use Crowd-Kit for categorical aggregation using the classical Dawid-Skene algorithm.

First, let us do all the necessary imports.

from crowdkit.aggregation import DawidSkene
from crowdkit.datasets import load_dataset

import pandas as pd

Then, you need to read your annotations into Pandas DataFrame with columns task, worker, label. Alternatively, you can download an example dataset:

df = pd.read_csv('results.csv')  # should contain columns: task, worker, label
# df, ground_truth = load_dataset('relevance-2')  # or download an example dataset

Then, you can aggregate the workers' responses using the fit_predict method from the scikit-learn library:

aggregated_labels = DawidSkene(n_iter=100).fit_predict(df)

More usage examples

Below is the list of currently implemented methods, including the already available (✅) and in progress (🟡).

• Ustalov D., Pavlichenko N., Tseitlin B. Learning from Crowds with Crowd-Kit. 2023. arXiv: 2109.08584 [cs.HC].

@misc{CrowdKit,
  author    = {Ustalov, Dmitry and Pavlichenko, Nikita and Tseitlin, Boris},
  title     = {{Learning from Crowds with Crowd-Kit}},
  year      = {2023},
  publisher = {arXiv},
  eprint    = {2109.08584},
  eprinttype = {arxiv},
  eprintclass = {cs.HC},
  url       = {https://arxiv.org/abs/2109.08584},
  language  = {english},
}

• To report a bug, post an issue on the Toloka/bugreport page.
• To find answers to common questions or start a new discussion, join our English-speaking Slack community.

© Crowd-Kit team authors, 2020–2023. Licensed under the Apache License, Version 2.0. See LICENSE file for more details.