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pipeline_tag: fill-mask
license: mit
base_model: FacebookAI/roberta-large
library_name: kerasformers
tags:
- keras
- kerasformers
- roberta
- fill-mask
- text-encoder
- arxiv:1907.11692
- pytorch
- jax
- tf
---
## ***See [our collection](https://huggingface.co/collections/kerasformers/roberta-6a6e8d9b2f4c9253f4145f65) for all versions of RoBERTa.***
# Run RoBERTa with Keras 3: JAX, PyTorch, or TensorFlow
[](https://github.com/IMvision12/KerasFormers) [](https://imvision12.github.io/KerasFormers/roberta/) [](https://huggingface.co/collections/kerasformers/roberta-6a6e8d9b2f4c9253f4145f65)
# kerasformers/roberta_large
Paper: [RoBERTa: A Robustly Optimized BERT Pretraining Approach (arXiv:1907.11692)](https://arxiv.org/abs/1907.11692) · [HF Papers](https://huggingface.co/papers/1907.11692)
RoBERTa is a robustly optimized BERT encoder: more data/steps, no NSP, dynamic masking, byte-level BPE (mask token `<mask>`), and padding-offset position ids.
For more details on the model, please go to the upstream [model card](https://huggingface.co/FacebookAI/roberta-large).
Pure-**Keras 3** conversion of [`FacebookAI/roberta-large`](https://huggingface.co/FacebookAI/roberta-large) for [kerasformers](https://github.com/IMvision12/KerasFormers). One implementation runs unmodified on **TensorFlow / Torch / JAX**.
This is a **fill-mask / encoder** checkpoint (`RobertaMaskedLM`, large). Task heads load via `hf:` fine-tunes.
## ✨ Quick start (fill-mask)
```python
import os
os.environ["KERAS_BACKEND"] = "torch" # or "jax" / "tensorflow"
from kerasformers.models.roberta import RobertaMaskedLM, RobertaTokenizer
mlm = RobertaMaskedLM.from_weights("kerasformers/roberta_large")
tokenizer = RobertaTokenizer.from_weights("kerasformers/roberta_large")
inputs = tokenizer("The capital of France is <mask>.")
logits = mlm(inputs) # (1, L, vocab_size)
mask = int((inputs["input_ids"][0] == tokenizer.mask_token_id).argmax())
print(tokenizer.decode([int(logits[0, mask].argmax())]))
```
Load any RoBERTa variant the same way with `from_weights("kerasformers/<variant>")`:
| Variant | Hub |
|---|---|
| `roberta_base` | [`kerasformers/roberta_base`](https://huggingface.co/kerasformers/roberta_base) |
| `roberta_large` | [`kerasformers/roberta_large`](https://huggingface.co/kerasformers/roberta_large) |
## Tips
- Set `KERAS_BACKEND` **before** importing Keras / kerasformers.
- Prefer `RobertaTokenizer.from_weights(...)` so BPE vocab matches.
- Use `<mask>` (not `[MASK]`).
- See [RoBERTa docs](https://imvision12.github.io/KerasFormers/roberta/) and [Loading Weights](https://imvision12.github.io/KerasFormers/loading_weights/).
- Community / upstream safetensors still work via the `hf:` prefix, e.g. `RobertaMaskedLM.from_weights("hf:FacebookAI/roberta-large")`.
## Special Thanks
A huge thank you to the Facebook AI RoBERTa authors for creating and releasing these models.
License: MIT.
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