From ac0e3828b49cab7fd943c293516917cfdc4404ee Mon Sep 17 00:00:00 2001
From: Yang Yang <yangyang62@baidu.com>
Date: Fri, 6 Oct 2017 21:15:29 +0000
Subject: [PATCH] test text

---
 paddle/framework/executor.cc | 102 +++++++++++++++++++++++++++++------
 paddle/framework/executor.h  |  16 ++++++
 2 files changed, 103 insertions(+), 15 deletions(-)

diff --git a/paddle/framework/executor.cc b/paddle/framework/executor.cc
index aafef12554f..89b83f82fb0 100644
--- a/paddle/framework/executor.cc
+++ b/paddle/framework/executor.cc
@@ -13,13 +13,17 @@ See the License for the specific language governing permissions and
 limitations under the License. */
 
 #include "paddle/framework/executor.h"
+#include <algorithm>
 #include <iostream>
 #include <memory>
+#include <set>
 #include <vector>
 #include "paddle/framework/lod_tensor.h"
 #include "paddle/framework/op_registry.h"
 #include "paddle/framework/scope.h"
 
+#include <boost/range/adaptor/reversed.hpp>
+
 namespace paddle {
 namespace framework {
 
@@ -64,26 +68,94 @@ void Executor::Run(const ProgramDesc& pdesc, Scope* scope) {
     scope->NewVar(var.name());
   }
 
-  for (auto& op_desc : block.ops()) {
-    auto op = paddle::framework::OpRegistry::CreateOp(op_desc);
-    std::cout << op->DebugString() << std::endl;
-    op->Run(*scope, *device);
+  std::vector<bool> should_run = Preprocess(pdesc);
+  PADDLE_ENFORCE(should_run.size() == block.ops_size(),
+                 "should_run.size() != block.ops_size()");
+  for (int i = 0; i < should_run.size(); ++i) {
+    if (should_run[i]) {
+      auto op = paddle::framework::OpRegistry::CreateOp(block.ops(i));
+      std::cout << op->DebugString() << std::endl;
+      op->Run(*scope, *device);
+    }
   }
 
-  // TODO(tonyyang-svail): need to test gpu device
-  for (auto& device_context : device_contexts_) {
-    device_context->Wait();
-  }
   // // print tensor value
-  for (auto& var : block.vars()) {
-    std::cout << var.name() << std::endl;
-    auto v = scope->FindVar(var.name());
-    const LoDTensor& t = v->Get<LoDTensor>();
-    for (int i = 0; i < t.numel(); ++i) {
-      std::cout << t.data<float>()[i] << " ";
+  // for (auto& var : block.vars()) {
+  //   std::cout << var.name() << std::endl;
+  //   auto v = scope->FindVar(var.name());
+  //   const LoDTensor& t = v->Get<LoDTensor>();
+  //   for (int i = 0; i < t.numel(); ++i) {
+  //     std::cout << t.data<float>()[i] << " ";
+  //   }
+  //   std::cout << std::endl;
+  // }
+}
+
+std::vector<bool> Executor::Preprocess(const ProgramDesc& pdesc) {
+  // TODO(tonyyang-svail):
+  //    - only runs the first block
+
+  auto& block = pdesc.blocks(0);
+  auto& ops = block.ops();
+
+  bool expect_feed = true;
+  for (auto& op_desc : ops) {
+    PADDLE_ENFORCE(op_desc.type() != "feed" || expect_feed,
+                   "All FeedOps are at the beginning of the ProgramDesc");
+    expect_feed = (op_desc.type() == "feed");
+  }
+
+  bool expect_fetch = true;
+  for (auto op_iter = ops.rbegin(); op_iter != ops.rend(); ++op_iter) {
+    auto& op_desc = *op_iter;
+    PADDLE_ENFORCE(op_desc.type() != "fetch" || expect_fetch,
+                   "All FetchOps must at the end of the ProgramDesc");
+    expect_fetch = (op_desc.type() == "fetch");
+  }
+
+  std::set<std::string> dependent_vars;
+  std::vector<bool> should_run;
+  for (auto op_iter = ops.rbegin(); op_iter != ops.rend(); ++op_iter) {
+    auto& op_desc = *op_iter;
+
+    bool found_dependent_vars = false;
+    for (auto& var : op_desc.outputs()) {
+      for (auto& argu : var.arguments()) {
+        if (dependent_vars.count(argu) != 0) {
+          found_dependent_vars = true;
+        }
+      }
+    }
+
+    // TODO(tonyyang-svail): add VLOG here for debugging
+    if (op_desc.type() == "fetch" || found_dependent_vars) {
+      // erase its output to the dependency graph
+      for (auto& var : op_desc.outputs()) {
+        for (auto& argu : var.arguments()) {
+          dependent_vars.erase(argu);
+        }
+      }
+
+      // insert its input to the dependency graph
+      for (auto& var : op_desc.inputs()) {
+        for (auto& argu : var.arguments()) {
+          dependent_vars.insert(argu);
+        }
+      }
+
+      // this op should be executed
+      should_run.push_back(true);
+    } else {
+      // this op should NOT be executed
+      should_run.push_back(false);
     }
-    std::cout << std::endl;
   }
+
+  // since we are traversing the ProgramDesc in reverse order
+  // we reverse the should_run vector
+  std::reverse(should_run.begin(), should_run.end());
+
+  return should_run;
 }
 
 }  // namespace framework
diff --git a/paddle/framework/executor.h b/paddle/framework/executor.h
index 9e443c8fca7..1d2e6c96ded 100644
--- a/paddle/framework/executor.h
+++ b/paddle/framework/executor.h
@@ -26,8 +26,24 @@ class Executor {
  public:
   explicit Executor(const std::vector<platform::Place>& places);
   ~Executor();
+
+  /* @Brief
+   * Runtime evaluation of the given ProgramDesc under certain Scope
+   *
+   * @param
+   *  ProgramDesc
+   *  Scope
+   */
   void Run(const ProgramDesc&, Scope*);
 
+ protected:
+  /* @Brief
+   *
+   * @param
+   *  ProgramDesc
+   */
+  std::vector<bool> Preprocess(const ProgramDesc& pdesc);
+
  private:
   std::vector<platform::DeviceContext*> device_contexts_;
 };
-- 
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