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G. Sun authored
Summary: This commit adds the implementation of the tree-constrained pointer generator (TCPGen) for contextual biasing. An example for Librispeech can be found in audio/examples/asr/librispeech_biasing. Maintainer's note (mthrok): It seems that TrieNode should be better typed as tuple, but changing the implementation from list to tuple could cause some issue without running the code, so the code is not changed, though the annotation uses tuple. Pull Request resolved: https://github.com/pytorch/audio/pull/2890 Reviewed By: nateanl Differential Revision: D43171447 Pulled By: mthrok fbshipit-source-id: 372bb077d997d720401dbf2dbfa131e6a958e37e
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