GPU-Accelerated Viterbi Exact Lattice Decoder forBatched Online and Offline Speech Recognition
Table 1: Validation of lattice quality with LibriSpeech model and test sets.
['[BOLD] Decoder', '[BOLD] test-clean  [BOLD] lat. den.', '[BOLD] test-clean  [BOLD] WER', '[BOLD] test-clean  [BOLD] OWER', '[BOLD] test-other  [BOLD] lat. den.', '[BOLD] test-other  [BOLD] WER', '[BOLD] test-other  [BOLD] OWER']
We validate that the word error rate (WER) is within tolerable limits, as well as the oracle word error rate (OWER). The Oracle WER is a proxy for determining if all expected alternate paths exist within the lattice. Finally, we measure the lattice density (lat. den.), which is an average measure of outgoing arcs. This confirms the produced lattices are of similar size.