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#pragma once
#include "data/iterator_facade.h"
#include "data/corpus.h"
namespace marian {
namespace data {
class TextInput;
class TextIterator : public IteratorFacade<TextIterator, SentenceTuple const> {
public:
TextIterator();
explicit TextIterator(TextInput& corpus);
private:
void increment() override;
bool equal(TextIterator const& other) const override;
const SentenceTuple& dereference() const override;
TextInput* corpus_;
long long int pos_;
SentenceTuple tup_;
};
class TextInput : public DatasetBase<SentenceTuple, TextIterator, CorpusBatch> {
private:
std::vector<UPtr<std::istringstream>> files_;
std::vector<Ptr<Vocab>> vocabs_;
size_t pos_{0};
size_t maxLength_{0};
bool maxLengthCrop_{false};
public:
typedef SentenceTuple Sample;
TextInput(std::vector<std::string> inputs, std::vector<Ptr<Vocab>> vocabs, Ptr<Options> options);
virtual ~TextInput() {}
Sample next() override;
void shuffle() override {}
void reset() override {}
iterator begin() override { return iterator(*this); }
iterator end() override { return iterator(); }
// TODO: There are half dozen functions called toBatch(), which are very
// similar. Factor them.
batch_ptr toBatch(const std::vector<Sample>& batchVector) override {
size_t batchSize = batchVector.size();
std::vector<size_t> sentenceIds;
std::vector<int> maxDims;
for(auto& ex : batchVector) {
if(maxDims.size() < ex.size())
maxDims.resize(ex.size(), 0);
for(size_t i = 0; i < ex.size(); ++i) {
if(ex[i].size() > (size_t)maxDims[i])
maxDims[i] = (int)ex[i].size();
}
sentenceIds.push_back(ex.getId());
}
std::vector<Ptr<SubBatch>> subBatches;
for(size_t j = 0; j < maxDims.size(); ++j) {
subBatches.emplace_back(New<SubBatch>(batchSize, maxDims[j], vocabs_[j]));
}
std::vector<size_t> words(maxDims.size(), 0);
for(size_t i = 0; i < batchSize; ++i) {
for(size_t j = 0; j < maxDims.size(); ++j) {
for(size_t k = 0; k < batchVector[i][j].size(); ++k) {
subBatches[j]->data()[k * batchSize + i] = batchVector[i][j][k];
subBatches[j]->mask()[k * batchSize + i] = 1.f;
words[j]++;
}
}
}
for(size_t j = 0; j < maxDims.size(); ++j)
subBatches[j]->setWords(words[j]);
auto batch = batch_ptr(new batch_type(subBatches));
batch->setSentenceIds(sentenceIds);
return batch;
}
void prepare() override {}
};
} // namespace data
} // namespace marian
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