Method backend

src/models/heartmula/codec.cpp:1342–1344

        throw std::runtime_error("HeartCodec flow estimator request shape is invalid");
    }
    if (scalar_decoder_graph_ != nullptr) {
        scalar_decoder_graph_->release_workspace();
    }
    if (flow_estimator_graph_ == nullptr || !flow_estimator_graph_->matches(*this, batch_size, frames)) {
        flow_estimator_graph_ = std::make_unique<HeartCodecFlowEstimatorGraph>(*this, batch_size, frames);
    }