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FlexCTC: GPU-powered CTC Beam Decoding With Advanced Contextual Abilities

Created by
  • Haebom

Author

Lilit Grigoryan, Vladimir Bataev, Nikolay Karpov, Andrei Andrusenko, Vitaly Lavrukhin, Boris Ginsburg

Outline

FlexCTC is a new open-source toolkit that provides fully GPU-based beam decoding for Connectionist Temporal Classification (CTC) models. It provides a fast, user-friendly, and highly scalable Python and PyTorch-based alternative to existing C++, CUDA, or WFST-based decoders. It features a high-performance, fully batched GPU implementation that eliminates CPU-GPU synchronization and minimizes kernel execution overhead via CUDA graphs. It also supports advanced contextualization techniques, such as GPU-based N-gram language model fusion and phrase-level boosting, enabling accurate and efficient decoding.

Takeaways, Limitations

Takeaways:
Provides faster GPU-based beam decoding than traditional slow, sequential CPU-based beam search methods.
It is developed based on Python and PyTorch, making it user-friendly and highly scalable.
Performance optimized by leveraging CUDA graphs.
Improve accuracy by supporting GPU-based N-gram language model fusion and phrase-level boosting.
Suitable for both research and commercial purposes.
Limitations:
This was not explicitly mentioned in the paper. Further experimental and comparative analysis is needed to understand Limitations. For example, there may be performance degradation on certain hardware environments or limitations on model sizes.
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