Add backward

paddle/fluid/operators/activation_mkldnn_op.cc

@@ -15,6 +15,7 @@
 #include "mkldnn.hpp"
 #include "paddle/fluid/operators/activation_op.h"
 #include "paddle/fluid/operators/mkldnn_activation_op.h"
+#include "paddle/fluid/platform/mkldnn_helper.h"
 
 namespace paddle {
 namespace operators {
@@ -25,9 +26,14 @@ using paddle::platform::MKLDNNDeviceContext;
 namespace {
 std::string gethash(const mkldnn::memory::dims &operand_dims,
                     const mkldnn::algorithm algorithm) {
-  return std::string(std::to_string(operand_dims[0]) + "-" +
-                     std::to_string(operand_dims[1]) + "-" +
-                     std::to_string(algorithm));
+  auto dim2str = [](const mkldnn::memory::dims &operand_dims) {
+    std::string dstr = "";
+    for (size_t i = 0; i < operand_dims.size(); ++i) {
+      dstr += std::to_string(operand_dims[i]) + "-";
+    }
+    return dstr;
+  };
+  return dim2str(operand_dims) + std::to_string(algorithm);
 }
 
 template <typename T, typename ExecContext>
@@ -44,7 +50,7 @@ void eltwise_forward(const ExecContext &ctx, mkldnn::algorithm algorithm,
   const auto *src_data = src->template data<T>();
 
   auto *dst = ctx.template Output<Tensor>("Out");
-  const T *dst_data = dst->template mutable_data<T>(ctx.GetPlace());
+  T *dst_data = dst->template mutable_data<T>(ctx.GetPlace());
 
   // get memory dim
   PADDLE_ENFORCE(src->dims().size() == 2 || src->dims().size() == 4,
@@ -52,15 +58,14 @@ void eltwise_forward(const ExecContext &ctx, mkldnn::algorithm algorithm,
   std::vector<int> src_tz = framework::vectorize2int(src->dims());
 
   const std::string key = gethash(src_tz, algorithm);
-  const std::string key_src_mem = key + "@eltwise_src_mem";
-  const std::string key_dst_mem = key + "@eltwise_dst_mem";
+  const std::string key_src_mem = key + "@eltwise_fwd_src_mem";
+  const std::string key_dst_mem = key + "@eltwise_fwd_dst_mem";
   const std::string key_fwd = key + "@eltwise_fwd";
 
-  std::shared_ptr<void> p_src_mem = dev_ctx.GetBlob(key_src_mem);
-  std::shared_ptr<void> p_dst_mem = dev_ctx.GetBlob(key_dst_mem);
-  std::shared_ptr<void> p_fwd = dev_ctx.GetBlob(key_fwd);
+  auto p_fwd = std::static_pointer_cast<mkldnn::eltwise_forward>(
+      dev_ctx.GetBlob(key_fwd));
 
-  if (p_src_mem == nullptr || p_dst_mem == nullptr || p_fwd == nullptr) {
+  if (p_fwd == nullptr) {
     // create memory description
     auto data_md = src_tz.size() == 2
                        ? platform::MKLDNNMemDesc(src_tz, mkldnn::memory::f32,
@@ -69,35 +74,40 @@ void eltwise_forward(const ExecContext &ctx, mkldnn::algorithm algorithm,
                                                  mkldnn::memory::format::nchw);
 
     // create memory primitives
-    p_src_mem = std::make_shared<mkldnn::memory>(
-        mkldnn::memory({data_md, mkldnn_engine},
-                       static_cast<void *>(const_cast<float *>(src_data))));
+    auto p_src_mem = std::make_shared<mkldnn::memory>(mkldnn::memory(
+        {data_md, mkldnn_engine}, platform::to_void_cast(src_data)));
     dev_ctx.SetBlob(key_src_mem, p_src_mem);
 
-    p_dst_mem = std::make_shared<mkldnn::memory>(
-        mkldnn::memory({data_md, mkldnn_engine},
-                       static_cast<void *>(const_cast<float *>(dst_data))));
+    auto p_dst_mem = std::make_shared<mkldnn::memory>(mkldnn::memory(
+        {data_md, mkldnn_engine}, platform::to_void_cast(dst_data)));
     dev_ctx.SetBlob(key_dst_mem, p_dst_mem);
 
     auto fwd_desc = mkldnn::eltwise_forward::desc(
         mkldnn::prop_kind::forward_training, algorithm, data_md, alpha, beta);
     auto p_fwd_pd = std::make_shared<mkldnn::eltwise_forward::primitive_desc>(
         fwd_desc, mkldnn_engine);
+    const std::string key_fwd_pd = key + "eltwise_fwd_pd";
+    dev_ctx.SetBlob(key_fwd_pd, p_fwd_pd);
     p_fwd = std::make_shared<mkldnn::eltwise_forward>(
-        *(p_fwd_pd.get()), *(static_cast<mkldnn::memory *>(p_src_mem.get())),
-        *(static_cast<mkldnn::memory *>(p_dst_mem.get())));
+        *p_fwd_pd, *(p_src_mem.get()), *(p_dst_mem.get()));
     dev_ctx.SetBlob(key_fwd, p_fwd);
   } else {
-    std::static_pointer_cast<mkldnn::memory>(p_src_mem)->set_data_handle(
-        reinterpret_cast<void *>(const_cast<T *>(src_data)));
-
-    std::static_pointer_cast<mkldnn::memory>(p_dst_mem)->set_data_handle(
-        reinterpret_cast<void *>(const_cast<T *>(dst_data)));
+    // primitives already exist
+    auto p_src_mem =
+        std::static_pointer_cast<mkldnn::memory>(dev_ctx.GetBlob(key_src_mem));
+    PADDLE_ENFORCE(p_src_mem != nullptr,
+                   "Fail to find eltwise p_src_mem in device context.");
+    auto p_dst_mem =
+        std::static_pointer_cast<mkldnn::memory>(dev_ctx.GetBlob(key_dst_mem));
+    PADDLE_ENFORCE(p_dst_mem != nullptr,
+                   "Fail to find eltwise p_src_mem in device context.");
+
+    p_src_mem->set_data_handle(platform::to_void_reinterpret_cast(src_data));
+    p_dst_mem->set_data_handle(dst_data);
   }
 
   // push primitive to stream and wait until it's executed
-  std::vector<mkldnn::primitive> pipeline = {
-      *(static_cast<mkldnn::eltwise_forward::primitive *>(p_fwd.get()))};
+  std::vector<mkldnn::primitive> pipeline = {*(p_fwd.get())};
   mkldnn::stream(mkldnn::stream::kind::eager).submit(pipeline).wait();
 }
 
@@ -121,47 +131,64 @@ void eltwise_grad(const ExecContext &ctx, mkldnn::algorithm algorithm,
   std::vector<int> src_tz = framework::vectorize2int(out->dims());
 
   const std::string key = gethash(src_tz, algorithm);
-  const std::string key_src_mem = key + "@eltwise_src_mem";
-  const std::string key_dst_mem = key + "@eltwise_dst_mem";
-  const std::string key_fwd = key + "@eltwise_fwd";
 
-  // create memory description
-  auto data_md = src_tz.size() == 2
-                     ? platform::MKLDNNMemDesc(src_tz, mkldnn::memory::f32,
-                                               mkldnn::memory::format::nc)
-                     : platform::MKLDNNMemDesc(src_tz, mkldnn::memory::f32,
-                                               mkldnn::memory::format::nchw);
-
-  // retrieve source memory from device context
-  const std::shared_ptr<void> src_mem = dev_ctx.GetBlob(key_src_mem);
-  auto *p_src_mem = static_cast<mkldnn::memory *>(src_mem.get());
-
-  // create memory primitives
-  auto diff_src_memory =
-      mkldnn::memory({data_md, mkldnn_engine},
-                     static_cast<void *>(const_cast<float *>(diff_src)));
-  auto diff_dst_memory =
-      mkldnn::memory({data_md, mkldnn_engine},
-                     static_cast<void *>(const_cast<float *>(diff_dst)));
-
-  auto backward_desc =
-      mkldnn::eltwise_backward::desc(algorithm, data_md, data_md, alpha, beta);
-
-  // retrieve eltwise primitive desc from device context
-  const std::shared_ptr<void> forward_pd = dev_ctx.GetBlob(key_fwd);
-  PADDLE_ENFORCE(forward_pd != nullptr,
-                 "Fail to find eltwise_pd in device context");
-  auto *p_forward_pd =
-      static_cast<mkldnn::eltwise_forward::primitive_desc *>(forward_pd.get());
-
-  auto eltwise_bwd_prim_desc = mkldnn::eltwise_backward::primitive_desc(
-      backward_desc, mkldnn_engine, *p_forward_pd);
-
-  auto eltwise_bwd = mkldnn::eltwise_backward(eltwise_bwd_prim_desc, *p_src_mem,
-                                              diff_dst_memory, diff_src_memory);
+  const std::string key_diff_src_mem = key + "@eltwise_diff_src_mem";
+  const std::string key_diff_dst_mem = key + "@eltwise_diff_dst_mem";
+  const std::string key_grad = key + "@eltwise_grad";
+
+  auto p_grad = std::static_pointer_cast<mkldnn::eltwise_forward::primitive>(
+      dev_ctx.GetBlob(key_grad));
+
+  if (p_grad == nullptr) {
+    // create memory description
+    auto data_md = src_tz.size() == 2
+                       ? platform::MKLDNNMemDesc(src_tz, mkldnn::memory::f32,
+                                                 mkldnn::memory::format::nc)
+                       : platform::MKLDNNMemDesc(src_tz, mkldnn::memory::f32,
+                                                 mkldnn::memory::format::nchw);
+
+    // create memory primitives
+    std::shared_ptr<void> p_diff_src_mem =
+        std::make_shared<mkldnn::memory>(mkldnn::memory(
+            {data_md, mkldnn_engine}, platform::to_void_cast(diff_src)));
+    dev_ctx.SetBlob(key_diff_src_mem, p_diff_src_mem);
+    std::shared_ptr<void> p_diff_dst_mem =
+        std::make_shared<mkldnn::memory>(mkldnn::memory(
+            {data_md, mkldnn_engine}, platform::to_void_cast(diff_dst)));
+    dev_ctx.SetBlob(key_diff_dst_mem, p_diff_dst_mem);
+
+    auto bwd_desc = mkldnn::eltwise_backward::desc(algorithm, data_md, data_md,
+                                                   alpha, beta);
+
+    const std::string key_fwd_pd = key + "eltwise_fwd_pd";
+    auto *p_fwd_pd = static_cast<mkldnn::eltwise_forward::primitive_desc *>(
+        dev_ctx.GetBlob(key_fwd_pd).get());
+
+    auto eltwise_bwd_prim_desc = mkldnn::eltwise_backward::primitive_desc(
+        bwd_desc, mkldnn_engine, *p_fwd_pd);
+
+    const std::string key_src_mem = key + "@eltwise_fwd_src_mem";
+    const std::shared_ptr<void> p_src_mem = dev_ctx.GetBlob(key_src_mem);
+
+    p_grad = std::make_shared<mkldnn::eltwise_backward>(
+        eltwise_bwd_prim_desc, *static_cast<mkldnn::memory *>(p_src_mem.get()),
+        *(static_cast<mkldnn::memory *>(p_diff_dst_mem.get())),
+        *(static_cast<mkldnn::memory *>(p_diff_src_mem.get())));
+  } else {
+    // primitives already exist
+    auto p_diff_src_mem = std::static_pointer_cast<mkldnn::memory>(
+        dev_ctx.GetBlob(key_diff_src_mem));
+    auto p_diff_dst_mem = std::static_pointer_cast<mkldnn::memory>(
+        dev_ctx.GetBlob(key_diff_dst_mem));
+
+    p_diff_src_mem->set_data_handle(
+        platform::to_void_reinterpret_cast(diff_src));
+    p_diff_dst_mem->set_data_handle(
+        platform::to_void_reinterpret_cast(diff_dst));
+  }
 
   // push primitive to stream and wait until it's executed
-  std::vector<mkldnn::primitive> pipeline = {eltwise_bwd};
+  std::vector<mkldnn::primitive> pipeline = {*(p_grad.get())};
   mkldnn::stream(mkldnn::stream::kind::eager).submit(pipeline).wait();
 }
 }  // anonymous namespace

paddle/fluid/platform/mkldnn_helper.h

@@ -38,6 +38,11 @@ void* to_void_cast(const Type* t) {
   return static_cast<void*>(const_cast<Type*>(t));
 }
 
+template <typename Type>
+void* to_void_reinterpret_cast(const Type* t) {
+  return reinterpret_cast<void*>(const_cast<Type*>(t));
+}
+
 template <class Type>
 using tf_desc = typename Type::desc;