context-graph.h
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// sherpa-onnx/csrc/context-graph.h
//
// Copyright (c) 2023 Xiaomi Corporation
#ifndef SHERPA_ONNX_CSRC_CONTEXT_GRAPH_H_
#define SHERPA_ONNX_CSRC_CONTEXT_GRAPH_H_
#include <memory>
#include <string>
#include <tuple>
#include <unordered_map>
#include <utility>
#include <vector>
#include "sherpa-onnx/csrc/log.h"
namespace sherpa_onnx {
class ContextGraph;
using ContextGraphPtr = std::shared_ptr<ContextGraph>;
struct ContextState {
int32_t token;
float token_score;
float node_score;
float output_score;
int32_t level;
float ac_threshold;
bool is_end;
std::string phrase;
std::unordered_map<int32_t, std::unique_ptr<ContextState>> next;
const ContextState *fail = nullptr;
const ContextState *output = nullptr;
ContextState() = default;
ContextState(int32_t token, float token_score, float node_score,
float output_score, int32_t level = 0, float ac_threshold = 0.0f,
bool is_end = false, const std::string &phrase = {})
: token(token),
token_score(token_score),
node_score(node_score),
output_score(output_score),
level(level),
ac_threshold(ac_threshold),
is_end(is_end),
phrase(phrase) {}
};
class ContextGraph {
public:
ContextGraph() = default;
ContextGraph(const std::vector<std::vector<int32_t>> &token_ids,
float context_score, float ac_threshold,
const std::vector<float> &scores = {},
const std::vector<std::string> &phrases = {},
const std::vector<float> &ac_thresholds = {})
: context_score_(context_score), ac_threshold_(ac_threshold) {
root_ = std::make_unique<ContextState>(-1, 0, 0, 0);
root_->fail = root_.get();
Build(token_ids, scores, phrases, ac_thresholds);
}
ContextGraph(const std::vector<std::vector<int32_t>> &token_ids,
float context_score, const std::vector<float> &scores = {},
const std::vector<std::string> &phrases = {})
: ContextGraph(token_ids, context_score, 0.0f, scores, phrases,
std::vector<float>()) {}
std::tuple<float, const ContextState *, const ContextState *> ForwardOneStep(
const ContextState *state, int32_t token_id,
bool strict_mode = true) const;
std::pair<bool, const ContextState *> IsMatched(
const ContextState *state) const;
std::pair<float, const ContextState *> Finalize(
const ContextState *state) const;
const ContextState *Root() const { return root_.get(); }
private:
float context_score_;
float ac_threshold_;
std::unique_ptr<ContextState> root_;
void Build(const std::vector<std::vector<int32_t>> &token_ids,
const std::vector<float> &scores,
const std::vector<std::string> &phrases,
const std::vector<float> &ac_thresholds) const;
void FillFailOutput() const;
};
} // namespace sherpa_onnx
#endif // SHERPA_ONNX_CSRC_CONTEXT_GRAPH_H_