It was the alphabet order. How simple dear Watson.
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New results:
WER: 0.083978, CER: 0.048448, loss: 88.367332
Thatâs more like it.
Thank you @othiele and @lissyx. I am deeply grateful for your help.
The dataset is freely available btw. https://github.com/Sixtease/cz-parliament-speech-corpus
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