Merge pull request #9922 from chengduoZH/feature/refine_gather_reduce

Refine gather and broadcast

paddle/fluid/framework/details/CMakeLists.txt

@@ -21,8 +21,10 @@ cc_library(ssa_graph_executor SRCS ssa_graph_executor.cc DEPS ssa_graph framewor
 cc_library(threaded_ssa_graph_executor SRCS threaded_ssa_graph_executor.cc DEPS fetch_op_handle ssa_graph_executor scope
         simple_threadpool device_context)
 
-cc_library(broadcast_op_handle SRCS broadcast_op_handle.cc DEPS op_handle_base scope ddim memory)
-cc_library(gather_op_handle SRCS gather_op_handle.cc DEPS op_handle_base scope ddim memory)
+cc_library(variable_visitor SRCS variable_visitor.cc DEPS lod_tensor selected_rows)
+
+cc_library(broadcast_op_handle SRCS broadcast_op_handle.cc DEPS op_handle_base variable_visitor scope ddim memory)
+cc_library(gather_op_handle SRCS gather_op_handle.cc DEPS op_handle_base scope variable_visitor ddim memory)
 
 cc_test(broadcast_op_test SRCS broadcast_op_handle_test.cc DEPS var_handle op_handle_base scope ddim memory
         device_context broadcast_op_handle)

paddle/fluid/framework/details/broadcast_op_handle.cc

@@ -13,95 +13,72 @@
 // limitations under the License.
 
 #include "paddle/fluid/framework/details/broadcast_op_handle.h"
+#include "paddle/fluid/framework/details/container_cast.h"
+#include "paddle/fluid/framework/details/variable_visitor.h"
 
 namespace paddle {
 namespace framework {
 namespace details {
-
-Tensor *GetTensorFromVar(Variable *in_var) {
-  if (in_var->IsType<LoDTensor>()) {
-    return in_var->GetMutable<LoDTensor>();
-  } else if (in_var->IsType<SelectedRows>()) {
-    return in_var->GetMutable<SelectedRows>()->mutable_value();
-  } else {
-    PADDLE_THROW("Var should be LoDTensor or SelectedRows");
-  }
-  return nullptr;
-}
-
 BroadcastOpHandle::BroadcastOpHandle(const std::vector<Scope *> &local_scopes,
                                      const std::vector<platform::Place> &places)
     : local_scopes_(local_scopes), places_(places) {}
 
 void BroadcastOpHandle::RunImpl() {
-  // the input may have dummy var.
-  std::vector<VarHandle *> in_var_handle;
-  for (auto *in : inputs_) {
-    auto *out_handle = dynamic_cast<VarHandle *>(in);
-    if (out_handle) {
-      in_var_handle.push_back(out_handle);
-    }
-  }
-  PADDLE_ENFORCE_EQ(in_var_handle.size(), 1,
-                    "The number of input should be one.");
+  // the input and output may have dummy var.
+  VarHandle *in_var_handle;
 
-  // the output may have dummy var.
-  std::vector<VarHandle *> out_var_handles;
-  for (auto *out : outputs_) {
-    auto *out_handle = dynamic_cast<VarHandle *>(out);
-    if (out_handle) {
-      out_var_handles.push_back(out_handle);
-    }
+  {
+    auto in_var_handles = DynamicCast<VarHandle>(inputs_);
+    PADDLE_ENFORCE_EQ(in_var_handles.size(), 1,
+                      "The number of input should be one.");
+    in_var_handle = in_var_handles[0];
   }
 
+  auto out_var_handles = DynamicCast<VarHandle>(outputs_);
+
   PADDLE_ENFORCE_EQ(
       out_var_handles.size(), places_.size(),
       "The number of output should equal to the number of places.");
 
-  // Wait input done, this Wait is asynchronous operation
-  auto &in_place = in_var_handle[0]->place_;
-  if (in_var_handle[0]->generated_op_) {
-    for (auto *out : out_var_handles) {
-      auto &out_p = out->place_;
-      in_var_handle[0]->generated_op_->Wait(dev_ctxes_[out_p]);
-    }
-  }
+  // Wait input done, this Wait is asynchronous operation platform::Place
+  // &in_place;
+  WaitInputVarGenerated(*in_var_handle);
 
-  //
-  auto in_scope_idx = in_var_handle[0]->scope_idx_;
-  auto in_var =
-      local_scopes_.at(in_scope_idx)->FindVar(in_var_handle[0]->name_);
-  Tensor *in_tensor = GetTensorFromVar(in_var);
+  auto *in_var = local_scopes_.at(in_var_handle->scope_idx_)
+                     ->FindVar(in_var_handle->name_);
+  PADDLE_ENFORCE_NOT_NULL(in_var);
+  Tensor &in_tensor = VariableVisitor::GetMutableTensor(in_var);
 
   for (auto *out : out_var_handles) {
+    if (*out == *in_var_handle) {
+      continue;
+    }
+
     auto &out_p = out->place_;
-    auto out_var = local_scopes_.at(out->scope_idx_)->FindVar(out->name_);
+    auto *out_var = local_scopes_.at(out->scope_idx_)->FindVar(out->name_);
 
-    PADDLE_ENFORCE_EQ(out_p.which(), in_place.which(),
+    PADDLE_ENFORCE_EQ(out_p.which(), in_var_handle->place_.which(),
                       "Places must be all on CPU or all on CUDA.");
 
-    if (in_var->IsType<framework::SelectedRows>()) {
-      auto &in_sr = in_var->Get<framework::SelectedRows>();
-      auto out_sr = out_var->GetMutable<framework::SelectedRows>();
-      if (&in_sr == out_sr) continue;
-      out_sr->set_height(in_sr.height());
-      out_sr->set_rows(in_sr.rows());
-      out_sr->mutable_value()->Resize(in_sr.value().dims());
-      out_sr->mutable_value()->mutable_data(out_p, in_sr.value().type());
-    } else if (in_var->IsType<framework::LoDTensor>()) {
-      auto in_lod = in_var->Get<framework::LoDTensor>();
-      auto out_lod = out_var->GetMutable<framework::LoDTensor>();
-      if (&in_lod == out_lod) continue;
-      out_lod->set_lod(in_lod.lod());
-      out_lod->Resize(in_lod.dims());
-      out_lod->mutable_data(out_p, in_lod.type());
-    } else {
-      PADDLE_THROW("Var should be LoDTensor or SelectedRows.");
-    }
+    VariableVisitor::ShareDimsAndLoD(*in_var, out_var);
+    VariableVisitor::GetMutableTensor(out_var)
+        .Resize(in_tensor.dims())
+        .mutable_data(out_p, in_tensor.type());
 
-    Tensor *out_tensor = GetTensorFromVar(out_var);
-    paddle::framework::TensorCopy(*in_tensor, out_p, *(dev_ctxes_[in_place]),
-                                  out_tensor);
+    auto dev_ctx = dev_ctxes_[out_p];
+    RunAndRecordEvent(out_p, [in_tensor, out_var, dev_ctx, out_p] {
+      paddle::framework::TensorCopy(
+          in_tensor, out_p, *(dev_ctx),
+          &VariableVisitor::GetMutableTensor(out_var));
+    });
+  }
+}
+
+void BroadcastOpHandle::WaitInputVarGenerated(const VarHandle &in_var) {
+  if (in_var.generated_op_) {
+    for (auto &pair : dev_ctxes_) {
+      in_var.generated_op_->Wait(pair.second);
+    }
   }
 }
 

paddle/fluid/framework/details/broadcast_op_handle.h

@@ -39,12 +39,12 @@ struct BroadcastOpHandle : public OpHandleBase {
 
  protected:
   void RunImpl() override;
+  void WaitInputVarGenerated(const VarHandle &in_var);
 
  private:
   const std::vector<Scope *> &local_scopes_;
   const std::vector<platform::Place> &places_;
 };
-
 }  // namespace details
 }  // namespace framework
 }  // namespace paddle

paddle/fluid/framework/details/container_cast.h

@@ -0,0 +1,40 @@
+//   Copyright (c) 2018 PaddlePaddle Authors. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#pragma once
+
+#include <type_traits>
+#include <vector>
+
+namespace paddle {
+namespace framework {
+namespace details {
+
+template <typename ResultType, typename ElemType>
+std::vector<ResultType*> DynamicCast(const std::vector<ElemType*>& container) {
+  static_assert(std::is_base_of<ElemType, ResultType>::value,
+                "ElementType must be a base class of ResultType");
+  std::vector<ResultType*> res;
+  for (auto* ptr : container) {
+    auto* derived = dynamic_cast<ResultType*>(ptr);
+    if (derived) {
+      res.emplace_back(derived);
+    }
+  }
+  return res;
+}
+
+}  // namespace details
+}  // namespace framework
+}  // namespace paddle

paddle/fluid/framework/details/gather_op_handle.cc

@@ -13,6 +13,8 @@
 // limitations under the License.
 
 #include "paddle/fluid/framework/details/gather_op_handle.h"
+#include "paddle/fluid/framework/details/container_cast.h"
+#include "paddle/fluid/framework/details/variable_visitor.h"
 
 namespace paddle {
 namespace framework {
@@ -23,81 +25,68 @@ GatherOpHandle::GatherOpHandle(const std::vector<Scope *> &local_scopes,
     : local_scopes_(local_scopes), places_(places) {}
 
 void GatherOpHandle::RunImpl() {
-  // the input may have dummy var.
-  std::vector<VarHandle *> in_var_handles;
-  for (auto *in : inputs_) {
-    auto *in_handle = dynamic_cast<VarHandle *>(in);
-    if (in_handle) {
-      in_var_handles.push_back(in_handle);
-    }
-  }
+  // the input and output may have dummy var.
+  auto in_var_handles = DynamicCast<VarHandle>(inputs_);
+
   PADDLE_ENFORCE_EQ(
       in_var_handles.size(), places_.size(),
       "The number of output should equal to the number of places.");
 
-  // the output may have dummy var.
-  std::vector<VarHandle *> out_var_handles;
-  for (auto *out : outputs_) {
-    auto *out_handle = dynamic_cast<VarHandle *>(out);
-    if (out_handle) {
-      out_var_handles.push_back(out_handle);
-    }
+  VarHandle *out_var_handle;
+  {
+    auto out_var_handles = DynamicCast<VarHandle>(outputs_);
+
+    PADDLE_ENFORCE_EQ(out_var_handles.size(), 1,
+                      "The number of output should be one.");
+    out_var_handle = out_var_handles.front();
   }
-  PADDLE_ENFORCE_EQ(out_var_handles.size(), 1,
-                    "The number of output should be one.");
 
-  auto in_0_handle = static_cast<VarHandle *>(in_var_handles[0]);
+  auto in_0_handle = in_var_handles[0];
   auto pre_in_var =
       local_scopes_[in_0_handle->scope_idx_]->FindVar(in_0_handle->name_);
   auto pre_place = in_0_handle->place_;
 
   PADDLE_ENFORCE(pre_in_var->IsType<framework::SelectedRows>(),
                  "Currently, gather_op only can gather SelectedRows.");
 
-  PADDLE_ENFORCE_EQ(out_var_handles[0]->place_.which(), pre_place.which(),
+  PADDLE_ENFORCE_EQ(out_var_handle->place_.which(), pre_place.which(),
                     "The place of input and output should be the same.");
 
   // Wait input done, this Wait is asynchronous operation
-  for (auto *in : in_var_handles) {
-    if (in->generated_op_) {
-      in->generated_op_->Wait(dev_ctxes_[in->place_]);
-    }
-  }
+  WaitInputVarGenerated(in_var_handles);
 
   std::vector<int64_t> out_rows;
   std::vector<Tensor> in_tensors;
   std::vector<platform::Place> in_places;
 
   auto &pre_in = pre_in_var->Get<framework::SelectedRows>();
   // gather the inputs
-  for (auto *in : in_var_handles) {
-    auto in_handle = static_cast<VarHandle *>(in);
+  for (auto *in_handle : in_var_handles) {
     auto in_p = in_handle->place_;
     in_places.push_back(in_p);
     PADDLE_ENFORCE_EQ(in_p.which(), pre_place.which(),
                       "Places must be all on CPU or all on CUDA.");
-    auto in_var =
+    auto *in_var =
         local_scopes_.at(in_handle->scope_idx_)->FindVar(in_handle->name_);
     auto &in_sr = in_var->Get<framework::SelectedRows>();
 
     PADDLE_ENFORCE_EQ(in_sr.value().type(), pre_in.value().type(),
                       "The type of input is not consistent.");
     PADDLE_ENFORCE_EQ(pre_in.height(), in_sr.height(),
                       "The height of inputs is not consistent.");
-    PADDLE_ENFORCE_EQ(pre_in.GetCompleteDims(), in_sr.GetCompleteDims(), ,
+    PADDLE_ENFORCE_EQ(pre_in.GetCompleteDims(), in_sr.GetCompleteDims(),
                       "The dims of inputs is not consistent.");
 
-    auto in_sr_rows = in_sr.rows();
+    auto &in_sr_rows = in_sr.rows();
     out_rows.insert(out_rows.end(), in_sr_rows.begin(), in_sr_rows.end());
 
     in_tensors.emplace_back(in_sr.value());
   }
 
   // write the output
-  auto &out_place = out_var_handles[0]->place_;
-  auto out_scope_idx = out_var_handles[0]->scope_idx_;
-  auto out_var =
-      local_scopes_[out_scope_idx]->FindVar(out_var_handles[0]->name_);
+  auto &out_place = out_var_handle->place_;
+  auto out_scope_idx = out_var_handle->scope_idx_;
+  auto out_var = local_scopes_[out_scope_idx]->FindVar(out_var_handle->name_);
 
   auto out = out_var->GetMutable<framework::SelectedRows>();
   out->set_height(pre_in.height());
@@ -110,13 +99,27 @@ void GatherOpHandle::RunImpl() {
   Tensor *out_tensor = out->mutable_value();
 
   // copy
-  int s = 0, e = 0;
-  for (size_t j = 0; j < in_tensors.size(); ++j) {
-    e += in_tensors[j].dims()[0];
-    auto sub_out = out_tensor->Slice(s, e);
-    paddle::framework::TensorCopy(in_tensors[j], out_place,
-                                  *(dev_ctxes_[in_places[j]]), &sub_out);
-    s = e;
+  auto dev_ctx = dev_ctxes_[out_place];
+  RunAndRecordEvent(out_place, [in_tensors, out_tensor, dev_ctx, out_place] {
+    int s = 0, e = 0;
+    for (size_t j = 0; j < in_tensors.size(); ++j) {
+      e += in_tensors[j].dims()[0];
+      auto sub_out = out_tensor->Slice(s, e);
+      paddle::framework::TensorCopy(in_tensors[j], out_place, *(dev_ctx),
+                                    &sub_out);
+      s = e;
+    }
+  });
+}
+
+void GatherOpHandle::WaitInputVarGenerated(
+    const std::vector<VarHandle *> &in_var_handles) {
+  for (auto *in : in_var_handles) {
+    if (in->generated_op_) {
+      for (auto pair : dev_ctxes_) {
+        in->generated_op_->Wait(pair.second);
+      }
+    }
   }
 }
 

paddle/fluid/framework/details/gather_op_handle.h

@@ -39,6 +39,7 @@ struct GatherOpHandle : public OpHandleBase {
 
  protected:
   void RunImpl() override;
+  void WaitInputVarGenerated(const std::vector<VarHandle *> &in_var_handles);
 
  private:
   const std::vector<Scope *> &local_scopes_;

paddle/fluid/framework/details/var_handle.h

@@ -61,6 +61,11 @@ struct VarHandle : public VarHandleBase {
   size_t scope_idx_;
   std::string name_;
   platform::Place place_;
+
+  bool operator==(const VarHandle& o) const {
+    return o.generated_op_ == generated_op_ && o.name_ == name_ &&
+           o.scope_idx_ == scope_idx_;
+  }
 };
 
 // Dummy Variable. It is used to represent dependencies between operators