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Adds a rewind method to the LexiconDecoder #97

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Adds a rewind method to the LexiconDecoder #97

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1 change: 1 addition & 0 deletions bindings/python/flashlight/lib/text/_decoder.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -363,6 +363,7 @@ PYBIND11_MODULE(flashlight_lib_text_decoder, m) {
.def("decode_end", &LexiconDecoder::decodeEnd)
.def("decode", &LexiconDecoder_decode, "emissions"_a, "T"_a, "N"_a)
.def("prune", &LexiconDecoder::prune, "look_back"_a = 0)
.def("rewind", &LexiconDecoder::rewind, "num_frames"_a)
.def(
"get_best_hypothesis",
&LexiconDecoder::getBestHypothesis,
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9 changes: 9 additions & 0 deletions flashlight/lib/text/decoder/LexiconDecoder.cpp
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Expand Up @@ -323,6 +323,15 @@ void LexiconDecoder::prune(int lookBack) {

nPrunedFrames_ = nDecodedFrames_ - lookBack;
}

void LexiconDecoder::rewind(int numFrames) {
int startFrame = std::max(1, nDecodedFrames_ - numFrames);
for (int i = startFrame; i <= nDecodedFrames_; i++) {
hyp_.erase(i);
}

nDecodedFrames_ = std::max(0, nDecodedFrames_ - numFrames);
}
} // namespace text
} // namespace lib
} // namespace fl
2 changes: 2 additions & 0 deletions flashlight/lib/text/decoder/LexiconDecoder.h
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Expand Up @@ -142,6 +142,8 @@ class FL_TEXT_API LexiconDecoder : public Decoder {

void prune(int lookBack = 0) override;

void rewind(int numFrames);

int nDecodedFramesInBuffer() const override;

DecodeResult getBestHypothesis(int lookBack = 0) const override;
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