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Make it possible to use a transformer model as encoder. #2022

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Make it possible to use a transformer model as encoder. #2022

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1 change: 1 addition & 0 deletions include/ctranslate2/models/transformer.h
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Original file line number Diff line number Diff line change
Expand Up @@ -13,6 +13,7 @@ namespace ctranslate2 {
TransformerModel(size_t num_heads = 0);
size_t current_spec_revision() const override;
std::unique_ptr<SequenceToSequenceReplica> as_sequence_to_sequence() const override;
std::unique_ptr<SequenceEncoderReplica> as_sequence_encoder() const override;

protected:
bool is_linear_weight(const std::string& variable_name) const override;
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9 changes: 9 additions & 0 deletions src/models/transformer.cc
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Expand Up @@ -89,6 +89,15 @@ namespace ctranslate2 {
return std::make_unique<EncoderDecoderReplica>(model, std::move(encoder), std::move(decoder));
}

std::unique_ptr<SequenceEncoderReplica> TransformerModel::as_sequence_encoder() const {
const auto scoped_device_setter = get_scoped_device_setter();

auto encoder = std::make_unique<layers::TransformerEncoder>(*this, "encoder");

const auto model = std::static_pointer_cast<const TransformerEncoderModel>(shared_from_this());
return std::make_unique<EncoderReplica>(model, std::move(encoder));
}

std::unique_ptr<Model> TransformerModel::clone() const {
return std::make_unique<TransformerModel>(*this);
}
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