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Decode files

In this section, we demonstrate how to use the Python API of sherpa-onnx to decode files.

Hint

We only support WAVE files of single channel and each sample should have 16-bit, while the sample rate of the file can be arbitrary and it does not need to be 16 kHz

Streaming zipformer

We use sherpa-onnx-streaming-zipformer-bilingual-zh-en-2023-02-20 as an example below.

cd /path/to/sherpa-onnx

python3 ./python-api-examples/online-decode-files.py \
  --tokens=./sherpa-onnx-streaming-zipformer-bilingual-zh-en-2023-02-20/tokens.txt \
  --encoder=./sherpa-onnx-streaming-zipformer-bilingual-zh-en-2023-02-20/encoder-epoch-99-avg-1.onnx \
  --decoder=./sherpa-onnx-streaming-zipformer-bilingual-zh-en-2023-02-20/decoder-epoch-99-avg-1.onnx \
  --joiner=./sherpa-onnx-streaming-zipformer-bilingual-zh-en-2023-02-20/joiner-epoch-99-avg-1.onnx \
  ./sherpa-onnx-streaming-zipformer-bilingual-zh-en-2023-02-20/test_wavs/0.wav \
  ./sherpa-onnx-streaming-zipformer-bilingual-zh-en-2023-02-20/test_wavs/1.wav \
  ./sherpa-onnx-streaming-zipformer-bilingual-zh-en-2023-02-20/test_wavs/2.wav \
  ./sherpa-onnx-streaming-zipformer-bilingual-zh-en-2023-02-20/test_wavs/3.wav \
  ./sherpa-onnx-streaming-zipformer-bilingual-zh-en-2023-02-20/test_wavs/8k.wav

Note

You can replace encoder-epoch-99-avg-1.onnx with encoder-epoch-99-avg-1.int8.onnx to use int8 models for decoding.

The output is given below:

./code/decode-files/streaming-transducer-bilingual-zh-en-2023-02-20.txt

Non-streaming zipformer

We use sherpa_onnx_zipformer_en_2023_04_01 as an example below.

cd /path/to/sherpa-onnx

python3 ./python-api-examples/offline-decode-files.py \
   --tokens=./sherpa-onnx-zipformer-en-2023-04-01/tokens.txt \
   --encoder=./sherpa-onnx-zipformer-en-2023-04-01/encoder-epoch-99-avg-1.onnx \
   --decoder=./sherpa-onnx-zipformer-en-2023-04-01/decoder-epoch-99-avg-1.onnx \
   --joiner=./sherpa-onnx-zipformer-en-2023-04-01/joiner-epoch-99-avg-1.onnx \
   ./sherpa-onnx-zipformer-en-2023-04-01/test_wavs/0.wav \
   ./sherpa-onnx-zipformer-en-2023-04-01/test_wavs/1.wav \
   ./sherpa-onnx-zipformer-en-2023-04-01/test_wavs/8k.wav

Note

You can replace encoder-epoch-99-avg-1.onnx with encoder-epoch-99-avg-1.int8.onnx to use int8 models for decoding.

The output is given below:

./code/decode-files/non-streaming-transducer-zipformer-2023-04-01.txt

Non-streaming paraformer

We use sherpa_onnx_offline_paraformer_zh_2023_03_28_chinese as an example below.

cd /path/to/sherpa-onnx

python3 ./python-api-examples/offline-decode-files.py \
 --tokens=./sherpa-onnx-paraformer-zh-2023-03-28/tokens.txt \
 --paraformer=./sherpa-onnx-paraformer-zh-2023-03-28/model.onnx \
 ./sherpa-onnx-paraformer-zh-2023-03-28/test_wavs/0.wav \
 ./sherpa-onnx-paraformer-zh-2023-03-28/test_wavs/1.wav \
 ./sherpa-onnx-paraformer-zh-2023-03-28/test_wavs/2.wav \
 ./sherpa-onnx-paraformer-zh-2023-03-28/test_wavs/8k.wav

Note

You can replace model.onnx with model.int8.onnx to use int8 models for decoding.

The output is given below:

./code/decode-files/non-streaming-paraformer-2023-03-28.txt