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✦ Free & open sourceData Science

Simple Transformers

Quickly train and evaluate transformer models with just 3 lines of code.

Simple Transformers for Python

Train and evaluate transformer models quickly with minimal code.

Free forever · open source · Apache-2.0
✓ Light setup✓ Browser-based✓ Real-time collaboration
7.6
ZEKAI
Fast NLP model training tool
Free & open source · Data Science
Ease of setup7
Usefulness9
Maintenance7
Community7.5
★ 4,255
GITHUB
May 2026
UPDATED
Apache-2.0
LICENSE
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⚡ Quick answer

Simple Transformers is a Python library built on top of Hugging Face Transformers that simplifies training and evaluating NLP models. It allows you to initialize, train, and evaluate a model in just three lines of code, making it ideal for data scientists working with text classification, NER, and question answering.

Runs on
Cross-platform
Hosting
Self-host
Languages
Python
License
Apache-2.0

What it is

The library provides task-specific wrapper classes like ClassificationModel, NERModel, and QuestionAnsweringModel to handle datasets easily using Pandas DataFrames. It supports a wide range of tasks including conversational AI, language generation, document retrieval, and multi-modal classification.

Who it's for

It suits data scientists and machine learning engineers who want to prototype and train transformer models quickly without writing boilerplate PyTorch training loops. It does not suit those who need low-level architectural control over every single layer of the transformer without using the library's abstraction layers.

Key features

Minimal Code Interface

Initialize, train, and evaluate models using only three lines of Python code.

Diverse Task Support

Built-in classes for text classification, NER, question answering, T5, and retrieval.

Pandas Integration

Feed training and evaluation data directly into models using standard pandas DataFrames.

Weights and Biases

Optional integration with wandb for tracking and visualizing training experiments.

How to start

Up and running in 3 steps

1
Create a conda environment and install PyTorch with appropriate CUDA support.
2
Install the simpletransformers package using pip.
3
Initialize a task-specific model using pandas DataFrames for your train and eval data.
Real talk

Our honest verdict

What's great

  • Dramatically reduces boilerplate code required for Hugging Face Transformers.
  • Supports a wide array of NLP tasks including retrieval and conversational AI.
  • Seamless integration with Pandas DataFrames for data preparation.
  • Built-in experiment tracking support via Weights and Biases.

Where it falls short

  • Abstraction layers may limit fine-grained control over custom training loops.
  • Requires managing PyTorch, CUDA, and hardware dependencies for GPU acceleration.
  • Relies on underlying Hugging Face library updates and ecosystem changes.
Cost

Pricing & license

The software is free under its Apache-2.0 license, and the only cost is running your own hardware infrastructure or optional tracking services like Weights and Biases.

Paid work

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870 open remote AI-training roles, updated November 14, 2026; most pay $20–$170 an hour. Zekai lists them free; the application goes to the employer’s platform.

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Questions

FAQ

What libraries is Simple Transformers built on?

It is built on top of the Hugging Face Transformers library and PyTorch.

Can I use custom pretrained models?

Yes, any compatible pretrained model type from Hugging Face can be used by setting the model type and name.

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