Error code:   JWTInvalidSignature
Exception:    InvalidSignatureError
Message:      Signature verification failed
Traceback:    Traceback (most recent call last):
                File "/src/libs/libapi/src/libapi/jwt_token.py", line 286, in validate_jwt
                  decoded = jwt.decode(
                      jwt=token,
                  ...<2 lines>...
                      options=options,
                  )
                File "/usr/local/lib/python3.14/site-packages/jwt/api_jwt.py", line 368, in decode
                  decoded = self.decode_complete(
                      jwt,
                  ...<8 lines>...
                      leeway=leeway,
                  )
                File "/usr/local/lib/python3.14/site-packages/jwt/api_jwt.py", line 265, in decode_complete
                  decoded = self._jws.decode_complete(
                      jwt,
                  ...<3 lines>...
                      detached_payload=detached_payload,
                  )
                File "/usr/local/lib/python3.14/site-packages/jwt/api_jws.py", line 270, in decode_complete
                  self._verify_signature(
                  ~~~~~~~~~~~~~~~~~~~~~~^
                      signing_input,
                      ^^^^^^^^^^^^^^
                  ...<4 lines>...
                      options=merged_options,
                      ^^^^^^^^^^^^^^^^^^^^^^^
                  )
                  ^
                File "/usr/local/lib/python3.14/site-packages/jwt/api_jws.py", line 417, in _verify_signature
                  raise InvalidSignatureError("Signature verification failed")
              jwt.exceptions.InvalidSignatureError: Signature verification failed

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Portuguese–Changana Parallel Corpus

Description

The first publicly available sentence-level parallel corpus for Portuguese and Changana (Xichangana/Ronga), a Bantu language spoken by approximately 3–5 million people in southern Mozambique, South Africa, and Zimbabwe.

Source

The corpus was constructed by aligning two Bible translations at the verse level:

Portuguese: Almeida Corrigida Fiel (ACF), published by Sociedade Bíblica Trinitária do Brasil.
Changana: Bibele hi Xizronga xa Namunhla (BRN), published in 2021 by Dumbeka Editores e Consultores (brn.xizronga.org).

The corpus covers the 27 books of the New Testament.

Statistics

Statistic	Portuguese	Changana
Aligned pairs	7,929	7,929
Mean sentence length (tokens)	20.0	18.4
Vocabulary size	18,715	25,727
CG/PT length ratio	0.92	0.92

Splits

Split	Pairs
Train	6,343
Dev	793
Test	793

Splits created with random shuffle (seed=42).

Languages

Portuguese (pt): Brazilian Portuguese, formal biblical register.
Changana (ts): Also known as Xichangana, Xangana, or Ronga. Bantu language (Niger-Congo family). ISO 639-1: ts (Tsonga cluster).

Limitations

Single domain (religious text)
Formal/archaic register, not conversational
Small size (7,929 pairs) by modern MT standards

Usage

from datasets import load_dataset

dataset = load_dataset("nazarioz/changana-pt-parallel")

# Access a training example
example = dataset["train"][0]
print(f"PT: {example['text_pt']}")
print(f"CG: {example['text_cg']}")

Citation

If you use this dataset, please cite:

@misc{changana-pt-parallel-2026,
  title={Portuguese--Changana Parallel Corpus},
  author={Nazario},
  year={2026},
  url={https://huggingface.co/datasets/nazarioz/changana-pt-parallel}
}

License

CC-BY-4.0

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