e475e750ac
* Support streaming zipformer CTC * test online zipformer2 CTC * Update doc of sherpa-onnx.cc * Add Python APIs for streaming zipformer2 ctc * Add Python API examples for streaming zipformer2 ctc * Swift API for streaming zipformer2 CTC * NodeJS API for streaming zipformer2 CTC * Kotlin API for streaming zipformer2 CTC * Golang API for streaming zipformer2 CTC * C# API for streaming zipformer2 CTC * Release v1.9.6
66 lines
1.9 KiB
C++
66 lines
1.9 KiB
C++
// sherpa-onnx/csrc/online-ctc-greedy-search-decoder.cc
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//
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// Copyright (c) 2023 Xiaomi Corporation
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#include "sherpa-onnx/csrc/online-ctc-greedy-search-decoder.h"
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#include <algorithm>
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#include <utility>
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#include <vector>
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#include "sherpa-onnx/csrc/macros.h"
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namespace sherpa_onnx {
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void OnlineCtcGreedySearchDecoder::Decode(
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Ort::Value log_probs, std::vector<OnlineCtcDecoderResult> *results) {
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std::vector<int64_t> log_probs_shape =
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log_probs.GetTensorTypeAndShapeInfo().GetShape();
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if (log_probs_shape[0] != results->size()) {
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SHERPA_ONNX_LOGE("Size mismatch! log_probs.size(0) %d, results.size(0): %d",
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static_cast<int32_t>(log_probs_shape[0]),
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static_cast<int32_t>(results->size()));
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exit(-1);
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}
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int32_t batch_size = static_cast<int32_t>(log_probs_shape[0]);
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int32_t num_frames = static_cast<int32_t>(log_probs_shape[1]);
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int32_t vocab_size = static_cast<int32_t>(log_probs_shape[2]);
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const float *p = log_probs.GetTensorData<float>();
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for (int32_t b = 0; b != batch_size; ++b) {
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auto &r = (*results)[b];
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int32_t prev_id = -1;
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for (int32_t t = 0; t != num_frames; ++t, p += vocab_size) {
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int32_t y = static_cast<int32_t>(std::distance(
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static_cast<const float *>(p),
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std::max_element(static_cast<const float *>(p),
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static_cast<const float *>(p) + vocab_size)));
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if (y == blank_id_) {
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r.num_trailing_blanks += 1;
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} else {
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r.num_trailing_blanks = 0;
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}
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if (y != blank_id_ && y != prev_id) {
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r.tokens.push_back(y);
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r.timestamps.push_back(t + r.frame_offset);
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}
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prev_id = y;
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} // for (int32_t t = 0; t != num_frames; ++t) {
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} // for (int32_t b = 0; b != batch_size; ++b)
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// Update frame_offset
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for (auto &r : *results) {
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r.frame_offset += num_frames;
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}
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}
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} // namespace sherpa_onnx
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