Unify PrintLogic in PrintLayer/ValuePrinter.

paddle/gserver/evaluators/Evaluator.cpp

@@ -888,19 +888,10 @@ Evaluator* Evaluator::create(const EvaluatorConfig& config) {
  */
 class ValuePrinter : public Evaluator {
 public:
-  ValuePrinter() {}
-
   virtual void eval(const NeuralNetwork& nn) {
     for (const std::string& name : config_.input_layers()) {
-      auto& argu = nn.getLayer(name)->getOutput();
-      std::unordered_map<std::string, std::string> out;
-      argu.getValueString(&out);
-      for (auto field : {"value", "id", "sequence pos", "sub-sequence pos"}) {
-        auto it = out.find(field);
-        if (it != out.end()) {
-          LOG(INFO) << "layer=" << name << " " << field << ":\n" << it->second;
-        }
-      }
+      nn.getLayer(name)->getOutput().printValueString(LOG(INFO),
+                                                      "layer=" + name + " ");
     }
   }
 

paddle/gserver/layers/PrintLayer.cpp

@@ -19,25 +19,17 @@ namespace paddle {
 class PrintLayer : public Layer {
 public:
   explicit PrintLayer(const LayerConfig& config) : Layer(config) {}
-  void forward(PassType passType) override;
-  void backward(const UpdateCallback& callback) override {}
-};
 
-void PrintLayer::forward(PassType passType) {
+  void forward(PassType passType) override {
     Layer::forward(passType);
     for (size_t i = 0; i != inputLayers_.size(); ++i) {
-    auto& argu = getInput(i);
-    const std::string& name = inputLayers_[i]->getName();
-    std::unordered_map<std::string, std::string> out;
-    argu.getValueString(&out);
-    for (auto field : {"value", "id", "sequence pos", "sub-sequence pos"}) {
-      auto it = out.find(field);
-      if (it != out.end()) {
-        LOG(INFO) << "layer=" << name << " " << field << ":\n" << it->second;
-      }
+      getInput(i).printValueString(LOG(INFO),
+                                   "layer=" + inputLayers_[i]->getName() + " ");
     }
   }
-}
+
+  void backward(const UpdateCallback& callback) override {}
+};
 
 REGISTER_LAYER(print, PrintLayer);
 

paddle/parameter/Argument.cpp

@@ -628,6 +628,18 @@ void Argument::getValueString(
   }
 }
 
+void Argument::printValueString(std::ostream& stream,
+                                const std::string& prefix) const {
+  std::unordered_map<std::string, std::string> out;
+  getValueString(&out);
+  for (auto field : {"value", "id", "sequence pos", "sub-sequence pos"}) {
+    auto it = out.find(field);
+    if (it != out.end()) {
+      stream << prefix << field << ":\n" << it->second;
+    }
+  }
+}
+
 void Argument::subArgFrom(const Argument& input,
                           size_t offset,
                           size_t height,

paddle/parameter/Argument.h

@@ -305,6 +305,9 @@ struct Argument {
    * @param out [out]: the return values.
    */
   void getValueString(std::unordered_map<std::string, std::string>* out) const;
+
+  void printValueString(std::ostream& stream,
+                        const std::string& prefix = "") const;
 };
 
 }  // namespace paddle