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#pragma once
#include "marian.h"
#include "data/shortlist.h"
#include "models/model_factory.h"
#include "3rd_party/mio/mio.hpp"
namespace marian {
class ScorerState {
public:
virtual ~ScorerState(){}
virtual Logits getLogProbs() const = 0;
virtual void blacklist(Expr /*totalCosts*/, Ptr<data::CorpusBatch> /*batch*/){};
};
class Scorer {
protected:
std::string name_;
float weight_;
public:
Scorer(const std::string& name, float weight)
: name_(name), weight_(weight) {}
virtual ~Scorer(){}
std::string getName() { return name_; }
float getWeight() { return weight_; }
virtual void clear(Ptr<ExpressionGraph>) = 0;
virtual Ptr<ScorerState> startState(Ptr<ExpressionGraph>,
Ptr<data::CorpusBatch>)
= 0;
virtual Ptr<ScorerState> step(Ptr<ExpressionGraph>,
Ptr<ScorerState>,
const std::vector<IndexType>&,
const Words&,
const std::vector<IndexType>& batchIndices,
int beamSize)
= 0;
virtual void init(Ptr<ExpressionGraph>) {}
virtual void setShortlistGenerator(Ptr<const data::ShortlistGenerator> /*shortlistGenerator*/){};
virtual Ptr<data::Shortlist> getShortlist() { return nullptr; };
virtual std::vector<float> getAlignment() { return {}; };
};
class ScorerWrapperState : public ScorerState {
protected:
Ptr<DecoderState> state_;
public:
ScorerWrapperState(Ptr<DecoderState> state) : state_(state) {}
virtual ~ScorerWrapperState() {}
virtual Ptr<DecoderState> getState() { return state_; }
virtual Logits getLogProbs() const override { return state_->getLogProbs(); };
virtual void blacklist(Expr totalCosts, Ptr<data::CorpusBatch> batch) override {
state_->blacklist(totalCosts, batch);
}
};
// class to wrap IEncoderDecoder in a Scorer interface
class ScorerWrapper : public Scorer {
private:
Ptr<IEncoderDecoder> encdec_;
std::string fname_;
std::vector<io::Item> items_;
const void* ptr_;
public:
ScorerWrapper(Ptr<models::IModel> encdec,
const std::string& name,
float weight,
std::vector<io::Item>& items)
: Scorer(name, weight),
encdec_(std::static_pointer_cast<IEncoderDecoder>(encdec)),
items_(items),
ptr_{0} {}
ScorerWrapper(Ptr<models::IModel> encdec,
const std::string& name,
float weight,
const std::string& fname)
: Scorer(name, weight),
encdec_(std::static_pointer_cast<IEncoderDecoder>(encdec)),
fname_(fname),
ptr_{0} {}
ScorerWrapper(Ptr<models::IModel> encdec,
const std::string& name,
float weight,
const void* ptr)
: Scorer(name, weight),
encdec_(std::static_pointer_cast<IEncoderDecoder>(encdec)),
ptr_{ptr} {}
virtual ~ScorerWrapper() {}
virtual void init(Ptr<ExpressionGraph> graph) override {
graph->switchParams(getName());
if(!items_.empty())
encdec_->load(graph, items_);
else if(ptr_)
encdec_->mmap(graph, ptr_);
else
encdec_->load(graph, fname_);
}
virtual void clear(Ptr<ExpressionGraph> graph) override {
graph->switchParams(getName());
encdec_->clear(graph);
}
virtual Ptr<ScorerState> startState(Ptr<ExpressionGraph> graph,
Ptr<data::CorpusBatch> batch) override {
graph->switchParams(getName());
return New<ScorerWrapperState>(encdec_->startState(graph, batch));
}
virtual Ptr<ScorerState> step(Ptr<ExpressionGraph> graph,
Ptr<ScorerState> state,
const std::vector<IndexType>& hypIndices,
const Words& words,
const std::vector<IndexType>& batchIndices,
int beamSize) override {
graph->switchParams(getName());
auto wrapperState = std::dynamic_pointer_cast<ScorerWrapperState>(state);
auto newState = encdec_->step(graph, wrapperState->getState(), hypIndices, words, batchIndices, beamSize);
return New<ScorerWrapperState>(newState);
}
virtual void setShortlistGenerator(
Ptr<const data::ShortlistGenerator> shortlistGenerator) override {
encdec_->setShortlistGenerator(shortlistGenerator);
};
virtual Ptr<data::Shortlist> getShortlist() override {
return encdec_->getShortlist();
};
virtual std::vector<float> getAlignment() override {
// This is called during decoding, where alignments only exist for the last time step. Hence front().
// This makes as copy. @TODO: It should be OK to return this as a const&.
return encdec_->getAlignment().front(); // [beam depth * max src length * batch size]
}
};
Ptr<Scorer> scorerByType(const std::string& fname,
float weight,
std::vector<io::Item> items,
Ptr<Options> options);
Ptr<Scorer> scorerByType(const std::string& fname,
float weight,
const std::string& model,
Ptr<Options> config);
std::vector<Ptr<Scorer>> createScorers(Ptr<Options> options);
std::vector<Ptr<Scorer>> createScorers(Ptr<Options> options, const std::vector<std::vector<io::Item>> models);
Ptr<Scorer> scorerByType(const std::string& fname,
float weight,
const void* ptr,
Ptr<Options> config);
std::vector<Ptr<Scorer>> createScorers(Ptr<Options> options, const std::vector<const void*>& ptrs);
std::vector<Ptr<Scorer>> createScorers(Ptr<Options> options, const std::vector<mio::mmap_source>& mmaps);
} // namespace marian
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