fix compile errors

paddle/framework/reader.cc

@@ -38,6 +38,8 @@ void ShuffleReader::ReadNext(std::vector<LoDTensor>* out) {
         break;
       }
     }
+    // TODO(fengjiayi): 'std::random_shuffle' can be very slow. It needs to be
+    // optimize.
     std::random_shuffle(buffer_.begin(), buffer_.end());
     iteration_pos_ = 0;
   }

paddle/framework/reader.h

@@ -28,6 +28,8 @@ class ReaderBase {
   virtual void ReadNext(std::vector<LoDTensor>* out) = 0;
   virtual bool HasNext() const = 0;
 
+  virtual void ReInit() = 0;
+
   DDim shape(size_t idx) const;
   std::vector<DDim> shapes() const { return shapes_; }
   void set_shapes(const std::vector<DDim>& shapes) { shapes_ = shapes; }
@@ -52,6 +54,8 @@ class DecoratedReader : public ReaderBase {
 
   bool HasNext() const override { return reader_->HasNext(); }
 
+  void ReInit() override { reader_->ReInit(); }
+
  protected:
   ReaderBase* reader_;
 };
@@ -59,9 +63,9 @@ class DecoratedReader : public ReaderBase {
 // file readers
 
 template <typename T>
-class RandomReader : public FileReader {
+class RandomDataGenerator : public FileReader {
  public:
-  RandomReader(const std::vector<DDim>& shapes, float min, float max)
+  RandomDataGenerator(const std::vector<DDim>& shapes, float min, float max)
       : FileReader(shapes), min_(min), max_(max) {
     PADDLE_ENFORCE_LE(
         min, max, "'min' shouldn't be greater than 'max'.(%f vs %f)", min, max);
@@ -91,6 +95,8 @@ class RandomReader : public FileReader {
 
   bool HasNext() const override { return true; }
 
+  void ReInit() override { return; }
+
  private:
   float min_;
   float max_;
@@ -139,6 +145,7 @@ class ReaderHolder {
 
   void ReadNext(std::vector<LoDTensor>* out) { reader_->ReadNext(out); }
   bool HasNext() const { return reader_->HasNext(); }
+  void ReInit() { reader_->ReInit(); }
 
   DDim shape(size_t idx) const { return reader_->shape(idx); }
   std::vector<DDim> shapes() const { return reader_->shapes(); }

paddle/operators/CMakeLists.txt

@@ -186,7 +186,7 @@ list(REMOVE_ITEM GENERAL_OPS ${DEPS_OPS})
 foreach(src ${GENERAL_OPS})
     op_library(${src})
 endforeach()
-file(APPEND ${pybind_file} "USE_OP(less_than);\nUSE_OP(logical_and);\nUSE_NO_KERNEL_OP(read_from_array);\nUSE_NO_KERNEL_OP(create_random_reader);\n")
+file(APPEND ${pybind_file} "USE_OP(less_than);\nUSE_OP(logical_and);\nUSE_NO_KERNEL_OP(read_from_array);\nUSE_NO_KERNEL_OP(create_random_data_generator);\n")
 
 set(GLOB_OP_LIB ${OP_LIBRARY} CACHE INTERNAL "Global OP library")
 

paddle/operators/create_reader_op.cc

@@ -18,8 +18,8 @@
 namespace paddle {
 namespace operators {
 
-std::vector<framework::DDim> RestoreShapes(const std::vector<int>& shape_concat,
-                                           const std::vector<int>& ranks) {
+static std::vector<framework::DDim> RestoreShapes(
+    const std::vector<int>& shape_concat, const std::vector<int>& ranks) {
   std::vector<framework::DDim> res;
   int offset = 0;
   for (int len : ranks) {
@@ -69,7 +69,7 @@ class CreateReaderInferVarType : public framework::VarTypeInference {
 };
 
 template <typename T>
-class CreateRandomReaderOp : public framework::OperatorBase {
+class CreateRandomDataGeneratorOp : public framework::OperatorBase {
  public:
   using framework::OperatorBase::OperatorBase;
   void Run(const framework::Scope& scope,
@@ -84,14 +84,15 @@ class CreateRandomReaderOp : public framework::OperatorBase {
     std::vector<framework::DDim> shapes = RestoreShapes(shape_concat, ranks);
     auto* out = scope.FindVar(Output("Out"))
                     ->template GetMutable<framework::ReaderHolder>();
-    out->Reset(new framework::RandomReader<T>(shapes, Attr<float>("min"),
-                                              Attr<float>("max")));
+    out->Reset(new framework::RandomDataGenerator<T>(shapes, Attr<float>("min"),
+                                                     Attr<float>("max")));
   }
 };
 
-class CreateRandomReaderOpMaker : public framework::OpProtoAndCheckerMaker {
+class CreateRandomDataGeneratorOpMaker
+    : public framework::OpProtoAndCheckerMaker {
  public:
-  CreateRandomReaderOpMaker(OpProto* op_proto, OpAttrChecker* op_checker)
+  CreateRandomDataGeneratorOpMaker(OpProto* op_proto, OpAttrChecker* op_checker)
       : OpProtoAndCheckerMaker(op_proto, op_checker) {
     AddOutput("Out", "(ReaderHolder) The created random reader.");
     AddAttr<std::vector<int>>("shape_concat",
@@ -107,7 +108,7 @@ class CreateRandomReaderOpMaker : public framework::OpProtoAndCheckerMaker {
     AddAttr<float>("min", "The lower bound of reader's uniform distribution.");
     AddAttr<float>("max", "The upper bound of reader's uniform distribution.");
     AddComment(R"DOC(
-      CreateRandomReader Operator
+      CreateRandomDataGenerator Operator
 
       This Op creates a random reader. 
       The reader generates random data instead of really reading from files.
@@ -186,9 +187,10 @@ class CreateBatchReaderOpMaker : public framework::OpProtoAndCheckerMaker {
 }  // namespace paddle
 
 namespace ops = paddle::operators;
-REGISTER_OPERATOR(create_random_reader, ops::CreateRandomReaderOp<float>,
+REGISTER_OPERATOR(create_random_data_generator,
+                  ops::CreateRandomDataGeneratorOp<float>,
                   ops::CreateFileReaderInferShape,
-                  ops::CreateRandomReaderOpMaker,
+                  ops::CreateRandomDataGeneratorOpMaker,
                   paddle::framework::EmptyGradOpMaker,
                   ops::CreateReaderInferVarType);
 REGISTER_OPERATOR(create_shuffle_reader, ops::CreateShuffleReaderOp,

paddle/operators/read_op.cc

@@ -59,7 +59,10 @@ class ReadOp : public framework::OperatorBase {
     framework::ReaderHolder* reader =
         scope.FindVar(Input("Reader"))->GetMutable<framework::ReaderHolder>();
     if (!reader->HasNext()) {
-      return;
+      reader->ReInit();
+      PADDLE_ENFORCE(
+          reader->HasNext(),
+          "Reader can not read the next data even it has been re-initialized.");
     }
     std::vector<std::string> out_arg_names = Outputs("Out");
     std::vector<framework::LoDTensor> ins;

python/paddle/v2/fluid/tests/test_cpp_reader.py

@@ -20,11 +20,11 @@ prog = fluid.framework.Program()
 block = prog.current_block()
 
 random_reader = block.create_var(
-    type=fluid.core.VarDesc.VarType.READER, name="RandomReader")
+    type=fluid.core.VarDesc.VarType.READER, name="RandomDataGenerator")
 random_reader.desc.set_lod_levels([0, 0])
 
-create_random_reader_op = block.append_op(
-    type="create_random_reader",
+create_random_data_generator_op = block.append_op(
+    type="create_random_data_generator",
     outputs={"Out": random_reader},
     attrs={
         "shape_concat": [1, 2, 1, 1],