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pipeline_tag: text-generation

WARNING: This is an intermediary checkpoint. It is not fully trained yet. You might want to use Bloom-1B3 if you want a model that has completed training.

BigScience Large Open-science Open-access Multilingual Language Model
Model Card

BigScience Logo

Version 1.0 / 26.May.2022

Table of Contents

  1. Model Details
  2. Uses
  3. Training Data
  4. Risks and Limitations
  5. Evaluation
  6. Recommendations
  7. Glossary and Calculations
  8. More Information
  9. Model Card Authors

Model Details


This section provides information for anyone who wants to know about the model.

Click to expand

Developed by: BigScience (website)

  • All collaborators are either volunteers or have an agreement with their employer. (Further breakdown of participants forthcoming.)

Model Type: Transformer-based Language Model

Version: 1.0.0

Languages: Multiple; see training data

License: RAIL License v1.0 (link)

Release Date Estimate: Monday, 11.July.2022

Send Questions to:

Cite as: BigScience, BigScience Language Open-science Open-access Multilingual (BLOOM) Language Model. International, May 2021-May 2022

Funded by:

  • The French government.

  • Hugging Face (website).

  • Organizations of contributors. (Further breakdown of organizations forthcoming.)

Technical Specifications

This section provides information for people who work on model development.

Click to expand

Please see the BLOOM training README for full details on replicating training.

Model Architecture: Modified from Megatron-LM GPT2 (see paper, BLOOM Megatron code):

  • Decoder-only architecture

  • Layer normalization applied to word embeddings layer (StableEmbedding; see code, paper)

  • ALiBI positional encodings (see paper), with GeLU activation functions

  • 350 million parameters:

Objective Function: Cross Entropy with mean reduction (see API documentation).

Compute infrastructure: Jean Zay Public Supercomputer, provided by the French government (see announcement).

  • Hardware: 384 A100 80GB GPUs (48 nodes):

    • Additional 32 A100 80GB GPUs (4 nodes) in reserve

    • 8 GPUs per node Using NVLink 4 inter-gpu connects, 4 OmniPath links

    • CPU: AMD

    • CPU memory: 512GB per node

    • GPU memory: 640GB per node

    • Inter-node connect: Omni-Path Architecture (OPA)

    • NCCL-communications network: a fully dedicated subnet

    • Disc IO network: shared network with other types of nodes

  • Software:


In progress.

Current training logs: Tensorboard link

  • Checkpoint size:

    • Bf16 weights: 329GB

    • Full checkpoint with optimizer states: 2.3TB

  • Training throughput: About 150 TFLOP per GPU per second

  • Number of epochs: 1 (current target)

  • Dates:

    • Started 11th March, 2022 11:42am PST

    • Estimated end: 5th July, 2022

  • Estimated cost of training: Equivalent of $2-5M in cloud computing (including preliminary experiments)

  • Server training location: Île-de-France, France


The BLOOM tokenizer (link) is a learned subword tokenizer trained using:

  • A byte-level Byte Pair Encoding (BPE) algorithm

  • A simple pre-tokenization rule, no normalization

  • A vocabulary size of 250,680

It was trained on a subset of a preliminary version of the corpus using alpha-weighting per language.

Environmental Impact

Click to expand

The training supercomputer, Jean Zay (website), uses mostly nuclear energy. The heat generated by it is reused for heating campus housing.

Estimated carbon emissions: (Forthcoming upon completion of training.)

Estimated electricity usage: (Forthcoming upon completion of training.)



This section addresses questions around how the model is intended to be used, discusses the foreseeable users of the model (including those affected by the model), and describes uses that are considered out of scope or misuse of the model. It provides information for anyone considering using the model or who is affected by the model.

Click to expand

Intended Use

This model is being created in order to enable public research on large language models (LLMs). LLMs are intended to be used for language generation or as a pretrained base model that can be further fine-tuned for specific tasks. Use cases below are not exhaustive.

Direct Use

  • Text generation

  • Exploring characteristics of language generated by a language model

    • Examples: Cloze tests, counterfactuals, generations with reframings

Downstream Use

  • Tasks that leverage language models include: Information Extraction, Question Answering, Summarization

Misuse and Out-of-scope Use

This section addresses what users ought not do with the model.

See the BLOOM License, Attachment A, for detailed usage restrictions. The below list is non-exhaustive, but lists some easily foreseeable problematic use cases.

Out-of-scope Uses

Using the model in high-stakes settings is out of scope for this model.  The model is not designed for critical decisions nor uses with any material consequences on an individual's livelihood or wellbeing. The model outputs content that appears factual but is not correct.

Out-of-scope Uses Include:
  • Usage in biomedical domains, political and legal domains, or finance domains

  • Usage for evaluating or scoring individuals, such as for employment, education, or credit

  • Applying the model for critical automatic decisions, generating factual content, creating reliable summaries, or generating predictions that must be correct


Intentionally using the model for harm, violating human rights, or other kinds of malicious activities, is a misuse of this model. This includes:

  • Spam generation

  • Disinformation and influence operations

  • Disparagement and defamation

  • Harassment and abuse

  • Deception

  • Unconsented impersonation and imitation

  • Unconsented surveillance

  • Generating content without attribution to the model, as specified in the RAIL License, Use Restrictions

Intended Users

Direct Users

  • General Public

  • Researchers

  • Students

  • Educators

  • Engineers/developers

  • Non-commercial entities

  • Community advocates, including human and civil rights groups

Indirect Users

Others Affected (Parties Prenantes)

  • People and groups referred to by the LLM

  • People and groups exposed to outputs of, or decisions based on, the LLM

  • People and groups whose original work is included in the LLM


Training Data

This section provides a high-level overview of the training data. It is relevant for anyone who wants to know the basics of what the model is learning.

Click to expand

Details for each dataset are provided in individual Data Cards.

Training data includes:

  • 45 natural languages

  • 12 programming languages

  • In 1.5TB of pre-processed text, converted into 350B unique tokens (see the tokenizer section for more.)


The pie chart shows the distribution of languages in training data.

pie chart showing the distribution of languages in training data

The following table shows the further distribution of Niger-Congo and Indic languages in the training data.

Click to expand
Niger Congo Percentage Indic Percentage
Chi Tumbuka 0.00002 Assamese 0.01
Kikuyu 0.00004 Odia 0.04
Bambara 0.00004 Gujarati 0.04
Akan 0.00007 Marathi 0.05
Xitsonga 0.00007 Punjabi 0.05
Sesotho 0.00007 Kannada 0.06
Chi Chewa 0.0001 Nepali 0.07
Setswana 0.0002 Telugu 0.09
Northern Sotho 0.0002 Malayalam 0.10
Fon 0.0002 Urdu 0.10
Kirundi 0.0003 Tamil 0.20
Wolof 0.0004 Bengali 0.50
Kuganda 0.0004 Hindi 0.70
Chi Shona 0.001
Isi Zulu 0.001
Igbo 0.001
Xhosa 0.001
Kinyarwanda 0.003
Yoruba 0.006
Swahili 0.02

The following table shows the distribution of programming languages.

Click to expand
Extension Language Number of files
java Java 5,407,724
php PHP 4,942,186
cpp C++ 2,503,930
py Python 2,435,072
js JavaScript 1,905,518
cs C# 1,577,347
rb Ruby 6,78,413
cc C++ 443,054
hpp C++ 391,048
lua Lua 352,317
go GO 227,763
ts TypeScript 195,254
C C 134,537
scala Scala 92,052
hh C++ 67,161
H C++ 55,899
tsx TypeScript 33,107
rs Rust 29,693
phpt PHP 9,702
c++ C++ 1,342
h++ C++ 791
php3 PHP 540
phps PHP 270
php5 PHP 166
php4 PHP 29


Risks and Limitations

This section identifies foreseeable harms and misunderstandings.

Click to expand

Model may:

  • Overrepresent some viewpoints and underrepresent others

  • Contain stereotypes

  • Contain personal information

  • Generate:

    • Hateful, abusive, or violent language

    • Discriminatory or prejudicial language

    • Content that may not be appropriate for all settings, including sexual content

  • Make errors, including producing incorrect information as if it were factual

  • Generate irrelevant or repetitive outputs



This section describes the evaluation protocols and provides the results.

Click to expand


This section describes the different ways performance is calculated and why.


Metric Why chosen
Perplexity Standard metric for quantifying model improvements during training
Cross Entropy Loss Standard objective for language models.

And multiple different metrics for specific tasks. (More evaluation metrics forthcoming upon completion of evaluation protocol.)


This section lists some different aspects of what BLOOM models. Its focus is on those aspects that are likely to give rise to high variance in model behavior.

  • Language, such as English or Yoruba

  • Domain, such as newswire or stories

  • Demographic characteristics, such as gender or nationality


Results are based on the Factors and Metrics.

Train-time Evaluation:

As of 25.May.2022, 15:00 PST:

  • Training Loss: 2.0

  • Validation Loss: 2.2

  • Perplexity: 8.9

(More evaluation scores forthcoming at the end of model training.)



This section provides information on warnings and potential mitigations.

Click to expand
  • Indirect users should be made aware when the content they're working with is created by the LLM.

  • Users should be aware of Risks and Limitations, and include an appropriate age disclaimer or blocking interface as necessary.

  • Models pretrained with the LLM should include an updated Model Card.

  • Users of the model should provide mechanisms for those affected to provide feedback, such as an email address for comments.


Glossary and Calculations

This section defines common terms and how metrics are calculated.

Click to expand


More Information

Click to expand

Dataset Creation

Blog post detailing the design choices during the dataset creation:

Technical Specifications

Blog post summarizing how the architecture, size, shape, and pre-training duration where selected:

More details on the architecture/optimizer:

Blog post on the hardware/engineering side:

Details on the distributed setup used for the training:

Tensorboard updated during the training:

Insights on how to approach training, negative results:

Details on the obstacles overcome during the preparation on the engineering side (instabilities, optimization of training throughput, so many technical tricks and questions):

Initial Results

Initial prompting experiments using interim checkpoints:


Model Card Authors

Ordered roughly chronologically and by amount of time spent.

Margaret Mitchell, Giada Pistilli, Yacine Jernite, Ezinwanne Ozoani, Marissa Gerchick, Nazneen Rajani, Sasha Luccioni, Irene Solaiman, Maraim Masoud, Somaieh Nikpoor, Carlos Muñoz Ferrandis, Stas Bekman, Christopher Akiki, Danish Contractor, David Lansky, Angelina McMillan-Major, Tristan Thrush, Suzana Ilić, Gérard Dupont, Shayne Longpre, Manan Dey, Stella Biderman, Douwe Kiela, Emi Baylor, Teven Le Scao, Aaron Gokaslan, Julien Launay