doctr-crnn-vgg16-bn

docTR CRNN VGG16-BN Recognition

Verified, byte-for-byte mirror of the official pretrained crnn_vgg16_bn recognition checkpoint distributed by docTR. The rrainn organization maintains this mirror for reproducible, immutable model resolution through the Hugging Face Hub.

This is a redistribution of an upstream docTR artifact. rrainn did not train or modify the model and is not affiliated with or endorsed by Mindee or the docTR maintainers.

Model details

The model implements the CRNN approach described in An End-to-End Trainable Neural Network for Image-based Sequence Recognition and Its Application to Scene Text Recognition, using docTR's rectangular VGG16-BN feature extractor.

Intended use

This model is intended for recognizing text in already-localized word images as part of an OCR pipeline. Suitable uses include document transcription, OCR benchmarking, and initialization for domain-specific fine-tuning.

This checkpoint is not a full-page detector. Pair it with a text detection model through docTR's ocr_predictor, or provide appropriately cropped word images through recognition_predictor.

Usage

Install the upstream runtime:

pip install "python-doctr==1.0.1"

Load directly with docTR's native Hugging Face integration:

from doctr.models import from_hub, recognition_predictor

# Pin a repository commit in production for reproducible model resolution.
model = from_hub("rrainn/doctr-crnn-vgg16-bn", revision="48f1ff1b42ae89ae5c28811d21d8b968aafcb436")
predictor = recognition_predictor(model)

For integrity-sensitive deployments, verify pytorch_model.bin against SHA256SUMS before loading the checkpoint.

Preprocessing

The docTR configuration bundled with this repository defines:

• RGB channel order
• Input shape: 3 × 32 × 128
• Mean: (0.694, 0.695, 0.693)
• Standard deviation: (0.299, 0.296, 0.301)

Use docTR's recognition predictor to apply the matching preprocessing and decoding behavior.

Training data and evaluation

The upstream checkpoint is described by docTR as pretrained on its text-recognition dataset. The exact training dataset composition, dataset versions, filtering, and training hyperparameters are not disclosed alongside this artifact. Accordingly, this mirror does not declare Hugging Face datasets metadata or make unsupported claims about training provenance.

rrainn has not independently benchmarked this mirrored checkpoint. docTR publishes recognition-model evaluations on FUNSD and CORD in its model-selection documentation; consult the upstream documentation for its methodology and current results.

Limitations and risks

• Recognition is limited to the configured Latin/French character vocabulary. Other scripts and unsupported characters cannot be represented.
• Accuracy may degrade on handwriting, curved or vertical text, severe blur, unusual typography, low contrast, or domains unlike the undisclosed training distribution.
• Because the complete training-data composition is unavailable, demographic, geographic, linguistic, and source-domain biases cannot be fully assessed.
• Sequence confidence is not guaranteed to be calibrated and should not be interpreted as a probability of correctness without task-specific validation.
• OCR output can contain consequential errors. Human review and domain-specific evaluation are required for legal, medical, financial, identity, accessibility, or other high-impact uses.

Security

PyTorch checkpoint formats should be treated as executable-adjacent untrusted input. Download only from a trusted revision, verify the published SHA-256 digest, and use a current PyTorch release with restricted loading such as torch.load(..., weights_only=True) where applicable. This mirror preserves the exact upstream bytes and does not add serialized code.

Artifact provenance

The binary was downloaded from the URL embedded in docTR v1.0.1 and renamed from crnn_vgg16_bn-0417f351.pt to the docTR Hub-standard pytorch_model.bin. Its bytes were not changed. Machine-readable provenance is available in PROVENANCE.json; the digest is also recorded in SHA256SUMS.

License and attribution

The upstream docTR project distributes this work under the Apache License 2.0. This repository includes the complete license text and an attribution NOTICE. The checkpoint is redistributed without modification and without warranty.

The Apache-2.0 license does not grant trademark rights. Names such as docTR and Mindee are used only to identify the origin and architecture of the artifact. Users are responsible for confirming that their use of the model and any underlying data complies with applicable laws and third-party rights.

Citation

@inproceedings{shi2016crnn,
  title={An End-to-End Trainable Neural Network for Image-based Sequence Recognition and Its Application to Scene Text Recognition},
  author={Shi, Baoguang and Bai, Xiang and Yao, Cong},
  booktitle={IEEE Conference on Computer Vision and Pattern Recognition},
  year={2016}
}

Please also cite the docTR project when this implementation or checkpoint materially contributes to your work.