Complete CreateShuffleReaderOp

paddle/framework/reader.h

@@ -33,6 +33,10 @@ class ReaderBase {
 
 class FileReader : public ReaderBase {
  public:
+  explicit FileReader(const std::vector<DDim>& shapes) : shapes_(shapes) {
+    PADDLE_ENFORCE(!shapes_.empty());
+  }
+
   DDim shape(size_t idx) const override;
   std::vector<DDim> shapes() const override { return shapes_; }
 
@@ -42,6 +46,10 @@ class FileReader : public ReaderBase {
 
 class ReaderDecorator : public ReaderBase {
  public:
+  explicit ReaderDecorator(ReaderBase* reader) : reader_(reader) {
+    PADDLE_ENFORCE_NOT_NULL(reader_);
+  }
+
   bool HasNext() const override { return reader_->HasNext(); }
 
   DDim shape(size_t idx) const override { return reader_->shape(idx); }
@@ -56,13 +64,11 @@ class ReaderDecorator : public ReaderBase {
 template <typename T>
 class RandomReader : public FileReader {
  public:
-  void Initialize(const std::vector<DDim>& shapes, float min, float max) {
+  RandomReader(const std::vector<DDim>& shapes, float min, float max)
+      : FileReader(shapes), min_(min), max_(max) {
     PADDLE_ENFORCE_LE(min, max,
                       "'min' should be less than or equal to 'max'.(%f vs %f)",
                       min, max);
-    shapes_ = shapes;
-    min_ = min;
-    max_ = max;
     unsigned int seed = std::random_device()();
     engine_.seed(seed);
     dist_ = std::uniform_real_distribution<float>(min_, max_);
@@ -101,10 +107,8 @@ class RandomReader : public FileReader {
 
 class ShuffleReader : public ReaderDecorator {
  public:
-  void Initialize(ReaderBase* reader, int buffer_size) {
-    reader_ = reader;
-    buffer_size_ = buffer_size;
-    iteration_pos_ = 0;
+  ShuffleReader(ReaderBase* reader, int buffer_size)
+      : ReaderDecorator(reader), buffer_size_(buffer_size), iteration_pos_(0) {
     buffer_.reserve(buffer_size);
   }
 
@@ -118,9 +122,8 @@ class ShuffleReader : public ReaderDecorator {
 
 class BatchReader : public ReaderDecorator {
  public:
-  void Initialize(ReaderBase* reader, int batch_size) {
-    reader_ = reader;
-    batch_size_ = batch_size;
+  BatchReader(ReaderBase* reader, int batch_size)
+      : ReaderDecorator(reader), batch_size_(batch_size) {
     buffer_.reserve(batch_size_);
   }
 
@@ -131,5 +134,21 @@ class BatchReader : public ReaderDecorator {
   std::vector<std::vector<LoDTensor>> buffer_;
 };
 
+class ReaderHolder {
+ public:
+  void Reset(ReaderBase* reader) { reader_.reset(reader); }
+
+  ReaderBase* Get() const { return reader_.get(); }
+
+  std::vector<LoDTensor> ReadNext() { return reader_->ReadNext(); }
+  bool HasNext() const { return reader_->HasNext(); }
+
+  DDim shape(size_t idx) const { return reader_->shape(idx); }
+  std::vector<DDim> shapes() const { return reader_->shapes(); }
+
+ private:
+  std::unique_ptr<ReaderBase> reader_;
+};
+
 }  // namespace framework
 }  // namespace paddle

paddle/operators/CMakeLists.txt

@@ -62,7 +62,7 @@ function(op_library TARGET)
     endif()
 
     # Define operators that don't need pybind here.
-    foreach(manual_pybind_op "net_op" "compare_op" "logical_op" "nccl_op" "tensor_array_read_write_op")
+    foreach(manual_pybind_op "net_op" "compare_op" "logical_op" "nccl_op" "tensor_array_read_write_op" "create_reader_op")
         if ("${TARGET}" STREQUAL "${manual_pybind_op}")
             set(pybind_flag 1)
         endif()
@@ -153,6 +153,7 @@ op_library(recurrent_op DEPS executor)
 op_library(warpctc_op DEPS dynload_warpctc sequence_padding sequence_scale math_function)
 op_library(cos_sim_op DEPS cos_sim_functor)
 op_library(parallel_do_op DEPS executor)
+op_library(create_reader_op DEPS reader)
 
 # Regist multiple Kernel to pybind
 if (WITH_GPU)
@@ -178,7 +179,7 @@ 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);\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_reader);\n")
 
 set(GLOB_OP_LIB ${OP_LIBRARY} CACHE INTERNAL "Global OP library")
 

paddle/operators/create_reader_op.cc

@@ -18,7 +18,7 @@
 namespace paddle {
 namespace operators {
 
-// general infershape
+// general infershape for file readers
 class CreateReaderInferShape : public framework::InferShapeBase {
  public:
   void operator()(framework::InferShapeContext* ctx) const override {
@@ -35,6 +35,7 @@ class CreateRandomReaderOp : public framework::OperatorBase {
            const platform::Place& dev_place) const override {
     const auto& shape_concat = Attr<std::vector<int>>("shape_concat");
     const auto& ranks = Attr<std::vector<int>>("ranks");
+    PADDLE_ENFORCE(!shape_concat.empty() && !ranks.empty());
     PADDLE_ENFORCE_EQ(std::accumulate(ranks.begin(), ranks.end(), 0),
                       int(shape_concat.size()),
                       "The accumulate of all ranks should be equal to the "
@@ -49,8 +50,9 @@ class CreateRandomReaderOp : public framework::OperatorBase {
       offset += len;
     }
     auto* out = scope.FindVar(Output("Out"))
-                    ->template GetMutable<framework::RandomReader<T>>();
-    out->Initialize(shapes, Attr<float>("min"), Attr<float>("max"));
+                    ->template GetMutable<framework::ReaderHolder>();
+    out->Reset(new framework::RandomReader<T>(shapes, Attr<float>("min"),
+                                              Attr<float>("max")));
   }
 };
 
@@ -58,7 +60,7 @@ class CreateRandomReaderOpMaker : public framework::OpProtoAndCheckerMaker {
  public:
   CreateRandomReaderOpMaker(OpProto* op_proto, OpAttrChecker* op_checker)
       : OpProtoAndCheckerMaker(op_proto, op_checker) {
-    AddOutput("Out", "(RandomReader) The created random reader.");
+    AddOutput("Out", "(ReaderHolder) The created random reader.");
     AddAttr<std::vector<int>>("shape_concat",
                               "The concat of all data's shapes.");
     AddAttr<std::vector<int>>(
@@ -81,6 +83,49 @@ class CreateRandomReaderOpMaker : public framework::OpProtoAndCheckerMaker {
   }
 };
 
+class CreateShuffleReaderInferShape : public framework::InferShapeBase {
+ public:
+  void operator()(framework::InferShapeContext* ctx) const override {
+    PADDLE_ENFORCE(ctx->HasInput("Underlying_reader"),
+                   "Input(Underlying_reader) of CreateShuffleReaderOp should "
+                   "not be null.");
+    PADDLE_ENFORCE(ctx->HasOutput("Out"),
+                   "Output(Out) of CreateShuffleReaderOp should not be null.");
+  }
+};
+
+class CreateShuffleReaderOp : public framework::OperatorBase {
+ public:
+  using framework::OperatorBase::OperatorBase;
+  void Run(const framework::Scope& scope,
+           const platform::Place& dev_place) const override {
+    const auto& underlying_reader = scope.FindVar(Input("Underlying_reader"))
+                                        ->Get<framework::ReaderHolder>();
+    auto* out = scope.FindVar(Output("Out"))
+                    ->template GetMutable<framework::ReaderHolder>();
+    out->Reset(new framework::ShuffleReader(underlying_reader.Get(),
+                                            Attr<int>("buffer_size")));
+  }
+};
+
+class CreateShuffleReaderOpMaker : public framework::OpProtoAndCheckerMaker {
+ public:
+  CreateShuffleReaderOpMaker(OpProto* op_proto, OpAttrChecker* op_checker)
+      : OpProtoAndCheckerMaker(op_proto, op_checker) {
+    AddInput(
+        "Underlying_reader",
+        "(ReaderHolder) The underlying reader for creating a shuffle reader.");
+    AddOutput("Out", "(ReaderHolder) The created shuffle reader.");
+    AddAttr<int>("buffer_size", "The shuffle buffer size.").GreaterThan(0);
+    AddComment(R"DOC(
+      CreateShuffleReader Operator
+
+      A shuffle reader takes another reader as its 'underlying reader'
+      and output the underlying reader's outputs in a shuffled order. 
+    )DOC");
+  }
+};
+
 }  // namespace operators
 }  // namespace paddle
 
@@ -88,3 +133,7 @@ namespace ops = paddle::operators;
 REGISTER_OPERATOR(create_random_reader, ops::CreateRandomReaderOp<float>,
                   ops::CreateReaderInferShape, ops::CreateRandomReaderOpMaker,
                   paddle::framework::EmptyGradOpMaker);
+REGISTER_OPERATOR(create_shuffle_reader, ops::CreateShuffleReaderOp,
+                  ops::CreateShuffleReaderInferShape,
+                  ops::CreateShuffleReaderOpMaker,
+                  paddle::framework::EmptyGradOpMaker);