Error while converting to Ctranslate2 from openNMTPy.

[aryan1165]

I have a openNMTPy model translator.pt. While converting it using ct2-opennmt-py-converter --model_path himangy_triton_repo/himangy-hi-pa/1/2.pt --output_dir ct2_model --quantization "int8" command. I get following error :-

  File "/opt/anaconda3/envs/NMT/bin/ct2-opennmt-py-converter", line 8, in <module>
    sys.exit(main())
  File "/opt/anaconda3/envs/NMT/lib/python3.10/site-packages/ctranslate2/converters/opennmt_py.py", line 355, in main
    OpenNMTPyConverter(args.model_path).convert_from_args(args)
  File "/opt/anaconda3/envs/NMT/lib/python3.10/site-packages/ctranslate2/converters/converter.py", line 50, in convert_from_args
    return self.convert(
  File "/opt/anaconda3/envs/NMT/lib/python3.10/site-packages/ctranslate2/converters/converter.py", line 89, in convert
    model_spec = self._load()
  File "/opt/anaconda3/envs/NMT/lib/python3.10/site-packages/ctranslate2/converters/opennmt_py.py", line 181, in _load
    check_opt(checkpoint["opt"], num_source_embeddings=len(src_vocabs))
  File "/opt/anaconda3/envs/NMT/lib/python3.10/site-packages/ctranslate2/converters/opennmt_py.py", line 55, in check_opt
    check.validate()
  File "/opt/anaconda3/envs/NMT/lib/python3.10/site-packages/ctranslate2/converters/utils.py", line 106, in validate
    raise_unsupported(self._unsupported_reasons)
  File "/opt/anaconda3/envs/NMT/lib/python3.10/site-packages/ctranslate2/converters/utils.py", line 93, in raise_unsupported
    raise ValueError(message)
ValueError: The model you are trying to convert is not supported by CTranslate2. We identified the following reasons:

- Options --encoder_type and --decoder_type must be 'transformer' or 'transformer_lm
- Options --position_encoding and --max_relative_positions cannot be both enabled or both disabled

Ctranslate2 - ctranslate2==4.3.1
OpenNMTPy - OpenNMT-py==1.2.0

[ymoslem]

The OpenNMT version is too old. You might try an older version of CTranslate2 (two years old, if still available).

However, let's first check the errors:

Options --encoder_type and --decoder_type must be 'transformer' or 'transformer_lm

Is this model based on the Transformer architecture? If not, it is not supported by CTranslate2.

Options --position_encoding and --max_relative_positions cannot be both enabled or both disabled

If you use max_relative_positions you must set position_encoding to False during training with OpenNMT. The error started to show in 2021, and I am not sure if there was an earlier version of CTranslate2 that didn't complain about it.

With all of this in mind, there is a chance you will not be able to convert this model to CTranslate2. Currently, there are several pre-trained OPUS models, NLLB-200, and MADLAD-400, all of which are supported by CTranslate2.

All the best!