From d430350f2d6b6e7848baed265d0a1038b8a07f36 Mon Sep 17 00:00:00 2001
From: Hieu Hoang <hieuhoang@gmail.com>
Date: Thu, 18 Jan 2018 17:38:09 +0000
Subject: add --tensor-cores arg

---
 src/amun/common/config.cpp              |  3 +++
 src/amun/common/god.cpp                 |  3 +++
 src/amun/common/god.h                   |  6 ++++--
 src/amun/gpu/decoder/encoder_decoder.cu | 20 ++++++++++++++++++++
 src/amun/gpu/decoder/encoder_decoder.h  |  2 ++
 5 files changed, 32 insertions(+), 2 deletions(-)

diff --git a/src/amun/common/config.cpp b/src/amun/common/config.cpp
index 85b8cc4b..1b20dd9b 100644
--- a/src/amun/common/config.cpp
+++ b/src/amun/common/config.cpp
@@ -200,6 +200,8 @@ void Config::AddOptions(size_t argc, char** argv) {
      "Implicitly sets minimal number of threads to number of devices.")
     ("gpu-threads", po::value<size_t>()->default_value(1),
      "Number of threads on a single GPU.")
+    ("tensor-cores", po::value<bool>()->default_value(false),
+      "Use Tensor Cores, if available.")
 #endif
 
 #ifdef HAS_CPU
@@ -333,6 +335,7 @@ void Config::AddOptions(size_t argc, char** argv) {
 #ifdef CUDA
   SET_OPTION("gpu-threads", size_t);
   SET_OPTION("devices", std::vector<size_t>);
+  SET_OPTION("tensor-cores", bool);
 #endif
 #ifdef HAS_CPU
   SET_OPTION("cpu-threads", size_t);
diff --git a/src/amun/common/god.cpp b/src/amun/common/god.cpp
index 9a531698..6acd01df 100644
--- a/src/amun/common/god.cpp
+++ b/src/amun/common/god.cpp
@@ -101,6 +101,9 @@ God& God::Init(int argc, char** argv) {
   //useFusedSoftmax_ = false;
   //cerr << "useFusedSoftmax_=" << useFusedSoftmax_ << endl;
 
+  useTensorCores_ = Get<bool>("tensor-cores");
+  //cerr << "useTensorCores_=" << useTensorCores_ << endl;
+
   if (Has("input-file")) {
     LOG(info)->info("Reading from {}", Get<std::string>("input-file"));
     inputStream_.reset(new InputFileStream(Get<std::string>("input-file")));
diff --git a/src/amun/common/god.h b/src/amun/common/god.h
index cd719ad9..2eceae80 100644
--- a/src/amun/common/god.h
+++ b/src/amun/common/god.h
@@ -88,6 +88,9 @@ class God {
     bool UseFusedSoftmax() const
     { return useFusedSoftmax_; }
 
+    bool UseTensorCores() const
+    { return useTensorCores_; }
+
   private:
     void LoadScorers();
     void LoadFiltering();
@@ -120,8 +123,7 @@ class God {
 
     std::unique_ptr<ThreadPool> pool_;
 
-    bool returnNBestList_;
-    bool useFusedSoftmax_;
+    bool returnNBestList_, useFusedSoftmax_, useTensorCores_;
 };
 
 }
diff --git a/src/amun/gpu/decoder/encoder_decoder.cu b/src/amun/gpu/decoder/encoder_decoder.cu
index b4331f6d..ab0a1aa6 100644
--- a/src/amun/gpu/decoder/encoder_decoder.cu
+++ b/src/amun/gpu/decoder/encoder_decoder.cu
@@ -75,6 +75,8 @@ EncoderDecoder::~EncoderDecoder()
 void EncoderDecoder::Encode(const SentencesPtr &source) {
   BEGIN_TIMER("Encode");
 
+  SetTensorCore();
+
   EncOutPtr encOut(new EncOutGPU(source));
 
   if (source->size()) {
@@ -163,6 +165,8 @@ void EncoderDecoder::DecodeAsync()
 
 void EncoderDecoder::DecodeAsyncInternal()
 {
+  SetTensorCore();
+
   unsigned maxBeamSize = god_.Get<unsigned>("beam-size");
 
   unsigned miniBatch = god_.Get<unsigned>("mini-batch");
@@ -459,6 +463,22 @@ unsigned EncoderDecoder::SentencesToGet(const Histories& histories)
   return ret;
 }
 
+void EncoderDecoder::SetTensorCore()
+{
+#if CUDA_VERSION >= 9000
+  if (god_.UseTensorCores()) {
+    //cerr << "using tensor cores" << endl;
+    cublasHandle_t handle = mblas::CublasHandler::GetHandle();
+    cublasStatus_t stat = cublasSetMathMode(handle, CUBLAS_TENSOR_OP_MATH);
+    if (stat != CUBLAS_STATUS_SUCCESS) {
+      printf ("cublasSetMathMode failed\n");
+      abort();
+    }
+  }
+#endif
+
+}
+
 }
 }
 
diff --git a/src/amun/gpu/decoder/encoder_decoder.h b/src/amun/gpu/decoder/encoder_decoder.h
index a0071621..d7e99974 100644
--- a/src/amun/gpu/decoder/encoder_decoder.h
+++ b/src/amun/gpu/decoder/encoder_decoder.h
@@ -120,6 +120,8 @@ class EncoderDecoder : public Scorer {
 
     unsigned SentencesToGet(const Histories& histories);
 
+    void SetTensorCore();
+
 };
 
 }
-- 
cgit v1.2.3