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Fix beam search output_log_prob index error #732

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Fix beam search output_log_prob index error #732

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4 changes: 3 additions & 1 deletion src/fastertransformer/layers/beam_search_layers/OnlineBeamSearchLayer.cu
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Original file line number Diff line number Diff line change
Expand Up @@ -115,6 +115,7 @@ void OnlineBeamSearchLayer<T>::invokeSoftMax(TensorMap* output_tensors, TensorMa

const int batch_size = output_tensors->at("output_ids").shape[1];
const int beam_width = output_tensors->at("output_ids").shape[2];
const int max_input_length = input_tensors->at("max_input_length").getVal<int>();
const int step = input_tensors->at("step").getVal<int>();
const int ite = input_tensors->at("ite").getVal<int>();
const int local_batch_size = input_tensors->at("logits").shape[0];
Expand All @@ -125,6 +126,7 @@ void OnlineBeamSearchLayer<T>::invokeSoftMax(TensorMap* output_tensors, TensorMa
input_tensors->isExist("len_penalty") ? input_tensors->at("len_penalty").getVal<float>() : 0.0f;

const int id_offset = step * batch_size * beam_width + local_batch_size * ite * beam_width;
const int gen_offset = (step - max_input_length) * batch_size * beam_width + local_batch_size * ite * beam_width;

BeamHypotheses beam_hyps;
if (output_tensors->isExist("beam_hyps")) {
Expand All @@ -147,7 +149,7 @@ void OnlineBeamSearchLayer<T>::invokeSoftMax(TensorMap* output_tensors, TensorMa
output_tensors->at("finished").getPtr<bool>(),
output_tensors->at("sequence_length").getPtr<int>(),
output_tensors->at("cum_log_probs").getPtr<float>(),
output_tensors->getPtrWithOffset<float>("output_log_probs", id_offset, nullptr),
output_tensors->getPtrWithOffset<float>("output_log_probs", gen_offset, nullptr),
output_tensors->at("output_ids").getPtrWithOffset<int>(id_offset),
topk_softmax_workspace_,
topk_softmax_workspace_size_,
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