Merge branch 'develop' of https://github.com/PaddlePaddle/Paddle into doc

Adjust some contents and create a new folder src to store pictures.

paddle/fluid/framework/CMakeLists.txt

@@ -21,7 +21,7 @@ endif()
 cc_test(eigen_test SRCS eigen_test.cc DEPS tensor)
 
 nv_test(mixed_vector_test SRCS mixed_vector_test.cu DEPS place paddle_memory device_context init)
-cc_library(lod_tensor SRCS lod_tensor.cc DEPS ddim place tensor framework_proto)
+cc_library(lod_tensor SRCS lod_tensor.cc DEPS ddim place tensor framework_proto recordio)
 cc_test(lod_tensor_test SRCS lod_tensor_test.cc DEPS lod_tensor paddle_memory)
 nv_test(lod_tensor_gpu_test SRCS lod_tensor_test.cu DEPS lod_tensor init)
 

paddle/fluid/framework/lod_tensor.cc

@@ -19,6 +19,9 @@ limitations under the License. */
 #include "paddle/fluid/memory/memcpy.h"
 #include "paddle/fluid/memory/memory.h"
 
+#include "paddle/fluid/recordio/scanner.h"
+#include "paddle/fluid/recordio/writer.h"
+
 #include <stdint.h>
 #include <string.h>
 #include <algorithm>
@@ -291,6 +294,31 @@ void DeserializeFromStream(std::istream &is, LoDTensor *tensor,
   TensorFromStream(is, static_cast<Tensor *>(tensor), dev_ctx);
 }
 
+void WriteToRecordIO(recordio::Writer &writer,
+                     const std::vector<LoDTensor> &tensor,
+                     const platform::DeviceContext &dev_ctx) {
+  std::stringstream buffer;
+  size_t sz = tensor.size();
+  buffer.write(reinterpret_cast<const char *>(&sz), sizeof(uint32_t));
+  for (auto &each : tensor) {
+    SerializeToStream(buffer, each, dev_ctx);
+  }
+  writer.Write(buffer.str());
+}
+
+std::vector<LoDTensor> ReadFromRecordIO(
+    recordio::Scanner &scanner, const platform::DeviceContext &dev_ctx) {
+  std::istringstream sin(scanner.Next());
+  uint32_t sz;
+  sin.read(reinterpret_cast<char *>(&sz), sizeof(uint32_t));
+  std::vector<LoDTensor> result;
+  result.resize(sz);
+  for (uint32_t i = 0; i < sz; ++i) {
+    DeserializeFromStream(sin, &result[i], dev_ctx);
+  }
+  return result;
+}
+
 std::vector<LoDTensor> LoDTensor::SplitLoDTensor(
     const std::vector<platform::Place> places) const {
   check_memory_size();

paddle/fluid/framework/lod_tensor.h

@@ -29,6 +29,12 @@ limitations under the License. */
 #include "paddle/fluid/platform/place.h"
 
 namespace paddle {
+
+namespace recordio {
+class Writer;
+class Scanner;
+}
+
 namespace framework {
 
 /*
@@ -209,5 +215,12 @@ void SerializeToStream(std::ostream& os, const LoDTensor& tensor,
 void DeserializeFromStream(std::istream& is, LoDTensor* tensor,
                            const platform::DeviceContext& dev_ctx);
 
+extern void WriteToRecordIO(recordio::Writer& writer,
+                            const std::vector<LoDTensor>& tensor,
+                            const platform::DeviceContext& dev_ctx);
+
+extern std::vector<LoDTensor> ReadFromRecordIO(
+    recordio::Scanner& scanner, const platform::DeviceContext& dev_ctx);
+
 }  // namespace framework
 }  // namespace paddle

paddle/fluid/framework/lod_tensor_test.cc

@@ -14,6 +14,9 @@
 
 #include "paddle/fluid/framework/lod_tensor.h"
 
+#include "paddle/fluid/recordio/scanner.h"
+#include "paddle/fluid/recordio/writer.h"
+
 #include <glog/logging.h>
 #include <gtest/gtest.h>
 #include <algorithm>
@@ -224,5 +227,43 @@ TEST(LoD, CheckAbsLoD) {
   abs_lod0.push_back(std::vector<size_t>({0}));
   ASSERT_FALSE(CheckAbsLoD(abs_lod0));
 }
+
+TEST(LoDTensor, RecordIO) {
+  LoDTensor tensor;
+  int* tmp = tensor.mutable_data<int>(make_ddim({4, 5}), platform::CPUPlace());
+  for (int i = 0; i < 20; ++i) {
+    tmp[i] = i;
+  }
+
+  std::stringstream* stream = new std::stringstream();
+  auto& ctx =
+      *platform::DeviceContextPool::Instance().Get(platform::CPUPlace());
+  {
+    recordio::Writer writer(stream, recordio::Compressor::kSnappy);
+    WriteToRecordIO(writer, {tensor, tensor}, ctx);
+    WriteToRecordIO(writer, {tensor, tensor}, ctx);
+    writer.Flush();
+  }
+
+  auto assert_tensor_ok = [](const LoDTensor& tensor) {
+    for (int i = 0; i < 20; ++i) {
+      ASSERT_EQ(tensor.data<int>()[i], i);
+    }
+  };
+
+  {
+    std::unique_ptr<std::istream> stream_ptr(stream);
+    recordio::Scanner scanner(std::move(stream_ptr));
+    auto tensors = ReadFromRecordIO(scanner, ctx);
+    ASSERT_EQ(tensors.size(), 2);
+    assert_tensor_ok(tensors[0]);
+    assert_tensor_ok(tensors[1]);
+    tensors = ReadFromRecordIO(scanner, ctx);
+    ASSERT_EQ(tensors.size(), 2);
+    assert_tensor_ok(tensors[0]);
+    assert_tensor_ok(tensors[1]);
+  }
+}
+
 }  // namespace framework
 }  // namespace paddle

paddle/fluid/framework/reader.h

@@ -33,6 +33,8 @@ class ReaderBase {
   std::vector<DDim> shapes() const { return shapes_; }
   void set_shapes(const std::vector<DDim>& shapes) { shapes_ = shapes; }
 
+  virtual bool HasNext() const = 0;
+
   virtual ~ReaderBase() {}
 
  protected:
@@ -53,6 +55,8 @@ class DecoratedReader : public ReaderBase {
 
   void ReInit() override { reader_->ReInit(); }
 
+  bool HasNext() const override { return reader_->HasNext(); }
+
  protected:
   ReaderBase* reader_;
 };
@@ -87,6 +91,8 @@ class ReaderHolder {
     reader_->set_shapes(shapes);
   }
 
+  bool HasNext() const { return reader_->HasNext(); }
+
  private:
   std::unique_ptr<ReaderBase> reader_;
 };

paddle/fluid/operators/detail/safe_ref.h

@@ -14,6 +14,8 @@ limitations under the License. */
 
 #pragma once
 
+#include "paddle/fluid/platform/enforce.h"
+
 namespace paddle {
 namespace operators {
 namespace detail {

paddle/fluid/operators/reader/CMakeLists.txt

 cc_library(reader_op_registry SRCS reader_op_registry.cc DEPS operator op_registry reader)
-op_library(create_random_data_generator_op SRCS create_random_data_generator_op.cc DEPS reader_op_registry)
-op_library(create_shuffle_reader_op SRCS create_shuffle_reader_op.cc DEPS reader_op_registry)
-op_library(create_batch_reader_op SRCS create_batch_reader_op.cc DEPS reader_op_registry)
-op_library(create_double_buffer_reader_op SRCS create_double_buffer_reader_op.cc DEPS reader_op_registry)
-set(READER_LIBRARY create_random_data_generator_op create_shuffle_reader_op create_batch_reader_op create_double_buffer_reader_op PARENT_SCOPE)
+set(LOCAL_READER_LIBS)
+
+function(reader_library TARGET_NAME)
+    set(oneValueArgs "")
+    set(multiValueArgs SRCS DEPS)
+    set(options "")
+    set(common_deps reader_op_registry)
+    cmake_parse_arguments(reader_library "${options}" "${oneValueArgs}"
+            "${multiValueArgs}" ${ARGN})
+    op_library(${TARGET_NAME} SRCS ${reader_library_SRCS} DEPS ${common_deps} ${reader_library_DEPS})
+    set(LOCAL_READER_LIBS
+            ${TARGET_NAME}
+            ${LOCAL_READER_LIBS}
+        PARENT_SCOPE)
+endfunction()
+
+reader_library(create_random_data_generator_op SRCS create_random_data_generator_op.cc)
+reader_library(create_shuffle_reader_op SRCS create_shuffle_reader_op.cc)
+reader_library(create_batch_reader_op SRCS create_batch_reader_op.cc)
+reader_library(create_recordio_file_reader_op SRCS create_recordio_file_reader_op.cc)
+reader_library(create_double_buffer_reader_op SRCS create_double_buffer_reader_op.cc)
+# Export local libraries to parent
+set(READER_LIBRARY ${LOCAL_READER_LIBS} PARENT_SCOPE)

paddle/fluid/operators/reader/create_double_buffer_reader_op.cc

@@ -37,6 +37,8 @@ class DoubleBufferReader : public framework::DecoratedReader {
 
   ~DoubleBufferReader() { buffer_->Close(); }
 
+  bool HasNext() const override;
+
  private:
   void PrefetchThreadFunc();
 
@@ -106,6 +108,8 @@ void DoubleBufferReader::PrefetchThreadFunc() {
   }
 }
 
+bool DoubleBufferReader::HasNext() const { PADDLE_THROW("Not Implemented"); }
+
 }  // namespace reader
 }  // namespace operators
 }  // namespace paddle

paddle/fluid/operators/reader/create_random_data_generator_op.cc

@@ -52,6 +52,8 @@ class RandomDataGenerator : public framework::FileReader {
 
   void ReInit() override { return; }
 
+  bool HasNext() const override { return true; }
+
  private:
   float min_;
   float max_;

paddle/fluid/operators/reader/create_recordio_file_reader_op.cc

+//   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.
+
+#include "paddle/fluid/operators/reader/reader_op_registry.h"
+#include "paddle/fluid/recordio/scanner.h"
+
+namespace paddle {
+namespace operators {
+namespace reader {
+class RecordIOFileReader : public framework::FileReader {
+ public:
+  RecordIOFileReader(const std::string& filename,
+                     const std::vector<framework::DDim>& shapes)
+      : FileReader(shapes),
+        scanner_(filename),
+        dev_ctx_(*platform::DeviceContextPool::Instance().Get(
+            platform::CPUPlace())) {}
+
+  void ReadNext(std::vector<framework::LoDTensor>* out) override {
+    *out = framework::ReadFromRecordIO(scanner_, dev_ctx_);
+  }
+
+  bool HasNext() const override { return scanner_.HasNext(); }
+
+  void ReInit() override { scanner_.Reset(); }
+
+ private:
+  recordio::Scanner scanner_;
+  const platform::DeviceContext& dev_ctx_;
+};
+
+class CreateRecordIOReaderOp : public framework::OperatorBase {
+ public:
+  using framework::OperatorBase::OperatorBase;
+
+ private:
+  void RunImpl(const framework::Scope& scope,
+               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 "
+                      "shape concat's length.");
+    std::vector<framework::DDim> shapes = RestoreShapes(shape_concat, ranks);
+    std::string filename = Attr<std::string>("filename");
+
+    auto* out = scope.FindVar(Output("Out"))
+                    ->template GetMutable<framework::ReaderHolder>();
+    out->Reset(new RecordIOFileReader(filename, shapes));
+  }
+};
+
+class CreateRecordIOReaderOpMaker : public FileReaderMakerBase {
+ public:
+  CreateRecordIOReaderOpMaker(OpProto* op_proto, OpAttrChecker* op_checker)
+      : FileReaderMakerBase(op_proto, op_checker) {
+    AddAttr<std::string>("filename", "The filename of record io reader");
+    AddComment(R"DOC(
+      CreateRecordIOReader Operator
+
+      Create a reader from a record io file
+    )DOC");
+  }
+};
+
+}  // namespace reader
+}  // namespace operators
+}  // namespace paddle
+
+namespace reader = paddle::operators::reader;
+
+REGISTER_FILE_READER_OPERATOR(create_recordio_file_reader,
+                              reader::CreateRecordIOReaderOp,
+                              reader::CreateRecordIOReaderOpMaker);

paddle/fluid/operators/reader/reader_op_registry.cc

@@ -35,7 +35,7 @@ FileReaderMakerBase::FileReaderMakerBase(
     framework::OpProtoAndCheckerMaker::OpProto* op_proto,
     framework::OpAttrChecker* op_checker)
     : OpProtoAndCheckerMaker(op_proto, op_checker) {
-  AddOutput("Out", "(ReaderHolder) The created random reader.");
+  AddOutput("Out", "(ReaderHolder) The created random reader.").AsDuplicable();
   AddAttr<std::vector<int>>("shape_concat", "The concat of all data's shapes.");
   AddAttr<std::vector<int>>(
       "ranks",

paddle/fluid/pybind/CMakeLists.txt

 if(WITH_PYTHON)
   cc_library(paddle_pybind SHARED
-    SRCS pybind.cc exception.cc protobuf.cc const_value.cc
+    SRCS pybind.cc exception.cc protobuf.cc const_value.cc recordio.cc
     DEPS pybind python backward proto_desc paddle_memory executor prune init profiler feed_fetch_method
     ${GLOB_OP_LIB})
   if(NOT APPLE AND NOT ANDROID)

paddle/fluid/pybind/pybind.cc

@@ -26,6 +26,7 @@ limitations under the License. */
 #include "paddle/fluid/framework/lod_tensor.h"
 #include "paddle/fluid/framework/lod_tensor_array.h"
 #include "paddle/fluid/framework/prune.h"
+#include "paddle/fluid/framework/reader.h"
 #include "paddle/fluid/framework/selected_rows.h"
 #include "paddle/fluid/operators/cond_op.h"
 #include "paddle/fluid/operators/net_op.h"
@@ -35,7 +36,9 @@ limitations under the License. */
 #include "paddle/fluid/pybind/const_value.h"
 #include "paddle/fluid/pybind/exception.h"
 #include "paddle/fluid/pybind/pybind.h"
+#include "paddle/fluid/pybind/recordio.h"
 #include "paddle/fluid/pybind/tensor_py.h"
+
 #include "paddle/fluid/string/to_string.h"
 
 #ifdef PADDLE_WITH_CUDA
@@ -217,8 +220,18 @@ All parameter, weight, gradient are variables in Paddle.
            [](Variable &self) -> operators::NetOp * {
              return self.GetMutable<operators::NetOp>();
            },
+           py::return_value_policy::reference)
+      .def("get_reader",
+           [](Variable &self) -> framework::ReaderHolder * {
+             PADDLE_ENFORCE(self.IsType<framework::ReaderHolder>());
+             return self.GetMutable<framework::ReaderHolder>();
+           },
            py::return_value_policy::reference);
 
+  py::class_<framework::ReaderHolder>(m, "Reader", "")
+      .def("has_next", &framework::ReaderHolder::HasNext)
+      .def("reset", &framework::ReaderHolder::ReInit);
+
   py::class_<Scope>(m, "Scope", "")
       .def("var",
            [](Scope &self, const std::string &name) -> Variable * {
@@ -474,6 +487,8 @@ All parameter, weight, gradient are variables in Paddle.
   m.def("enable_profiler", platform::EnableProfiler);
   m.def("disable_profiler", platform::DisableProfiler);
   m.def("reset_profiler", platform::ResetProfiler);
+
+  BindRecordIOWriter(m);
   return m.ptr();
 }
 }  // namespace pybind

paddle/fluid/pybind/recordio.cc

+//   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.
+
+#include "paddle/fluid/pybind/recordio.h"
+#include <fstream>
+#include "paddle/fluid/framework/lod_tensor.h"
+#include "paddle/fluid/recordio/writer.h"
+
+namespace paddle {
+namespace pybind {
+
+class RecordIOWriter {
+ public:
+  RecordIOWriter(const std::string& filename, recordio::Compressor compressor,
+                 size_t max_num_record)
+      : stream_(filename), writer_(&stream_, compressor, max_num_record) {}
+
+  void AppendTensor(const framework::LoDTensor& tensor) {
+    tensors_.push_back(tensor);
+  }
+
+  void CompleteAppendTensor() {
+    auto& ctx =
+        *platform::DeviceContextPool::Instance().Get(platform::CPUPlace());
+    framework::WriteToRecordIO(writer_, tensors_, ctx);
+    tensors_.clear();
+  }
+
+  void Close() {
+    PADDLE_ENFORCE(tensors_.empty());
+    writer_.Flush();
+    stream_.close();
+  }
+
+ private:
+  std::vector<framework::LoDTensor> tensors_;
+  std::ofstream stream_;
+  recordio::Writer writer_;
+};
+
+void BindRecordIOWriter(py::module& m) {
+  py::class_<RecordIOWriter> writer(m, "RecordIOWriter", "");
+  py::enum_<recordio::Compressor>(writer, "Compressor", "")
+      .value("Snappy", recordio::Compressor::kSnappy)
+      .value("NoCompress", recordio::Compressor::kNoCompress);
+
+  writer
+      .def("__init__",
+           [](RecordIOWriter& self, const std::string& filename,
+              recordio::Compressor compressor, size_t max_num_record) {
+             new (&self) RecordIOWriter(filename, compressor, max_num_record);
+           })
+      .def("append_tensor", &RecordIOWriter::AppendTensor)
+      .def("complete_append_tensor", &RecordIOWriter::CompleteAppendTensor)
+      .def("close", &RecordIOWriter::Close);
+}
+
+}  // namespace pybind
+}  // namespace paddle

paddle/fluid/pybind/recordio.h

+//   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 "pybind11/pybind11.h"
+#include "pybind11/stl.h"
+
+namespace py = pybind11;
+
+namespace paddle {
+namespace pybind {
+
+extern void BindRecordIOWriter(py::module& m);
+}  // namespace pybind
+}  // namespace paddle

paddle/fluid/recordio/CMakeLists.txt

@@ -3,4 +3,7 @@ cc_library(header SRCS header.cc)
 cc_test(header_test SRCS header_test.cc DEPS header)
 cc_library(chunk SRCS chunk.cc DEPS snappystream snappy header zlib)
 cc_test(chunk_test SRCS chunk_test.cc DEPS chunk)
-cc_library(recordio DEPS chunk header)
+cc_library(writer SRCS writer.cc DEPS chunk)
+cc_library(scanner SRCS scanner.cc DEPS chunk)
+cc_test(writer_scanner_test SRCS writer_scanner_test.cc DEPS writer scanner)
+cc_library(recordio DEPS chunk header writer scanner)

paddle/fluid/recordio/chunk.cc

@@ -24,33 +24,52 @@ namespace paddle {
 namespace recordio {
 constexpr size_t kMaxBufSize = 1024;
 
+/**
+ * Read Stream by a fixed sized buffer.
+ * @param in input stream
+ * @param limit read at most `limit` bytes from input stream. 0 means no limit
+ * @param callback A function object with (const char* buf, size_t size) -> void
+ * as its type.
+ */
 template <typename Callback>
-static void ReadStreamByBuf(std::istream& in, int limit, Callback callback) {
+static void ReadStreamByBuf(std::istream& in, size_t limit, Callback callback) {
   char buf[kMaxBufSize];
   std::streamsize actual_size;
   size_t counter = 0;
-  do {
-    auto actual_max =
-        limit > 0 ? std::min(limit - counter, kMaxBufSize) : kMaxBufSize;
-    actual_size = in.readsome(buf, actual_max);
+  size_t actual_max;
+  while (!in.eof() ||
+         (limit != 0 && counter >= limit)) {  // End of file or reach limit
+    actual_max =
+        limit != 0 ? std::min(limit - counter, kMaxBufSize) : kMaxBufSize;
+    in.read(buf, actual_max);
+    actual_size = in.gcount();
     if (actual_size == 0) {
       break;
     }
     callback(buf, actual_size);
-    if (limit > 0) {
+    if (limit != 0) {
       counter += actual_size;
     }
-  } while (actual_size == kMaxBufSize);
+  }
+  in.clear();  // unset eof state
 }
 
+/**
+ * Copy stream in to another stream
+ */
 static void PipeStream(std::istream& in, std::ostream& os) {
   ReadStreamByBuf(
-      in, -1, [&os](const char* buf, size_t len) { os.write(buf, len); });
+      in, 0, [&os](const char* buf, size_t len) { os.write(buf, len); });
 }
-static uint32_t Crc32Stream(std::istream& in, int limit = -1) {
-  auto crc = crc32(0, nullptr, 0);
+
+/**
+ * Calculate CRC32 from an input stream.
+ */
+static uint32_t Crc32Stream(std::istream& in, size_t limit = 0) {
+  uint32_t crc = static_cast<uint32_t>(crc32(0, nullptr, 0));
   ReadStreamByBuf(in, limit, [&crc](const char* buf, size_t len) {
-    crc = crc32(crc, reinterpret_cast<const Bytef*>(buf), len);
+    crc = static_cast<uint32_t>(crc32(
+        crc, reinterpret_cast<const Bytef*>(buf), static_cast<uInt>(len)));
   });
   return crc;
 }
@@ -85,28 +104,29 @@ bool Chunk::Write(std::ostream& os, Compressor ct) const {
     compressed_stream.reset();
   }
 
-  auto end_pos = sout.tellg();
+  sout.seekg(0, std::ios::end);
+  uint32_t len = static_cast<uint32_t>(sout.tellg());
   sout.seekg(0, std::ios::beg);
-  uint32_t len = static_cast<uint32_t>(end_pos - sout.tellg());
   uint32_t crc = Crc32Stream(sout);
-  sout.seekg(0, std::ios::beg);
-
   Header hdr(static_cast<uint32_t>(records_.size()), crc, ct, len);
   hdr.Write(os);
+  sout.seekg(0, std::ios::beg);
+  sout.clear();
   PipeStream(sout, os);
   return true;
 }
 
-void Chunk::Parse(std::istream& sin) {
+bool Chunk::Parse(std::istream& sin) {
   Header hdr;
-  hdr.Parse(sin);
+  bool ok = hdr.Parse(sin);
+  if (!ok) {
+    return ok;
+  }
   auto beg_pos = sin.tellg();
-  auto crc = Crc32Stream(sin, hdr.CompressSize());
+  uint32_t crc = Crc32Stream(sin, hdr.CompressSize());
   PADDLE_ENFORCE_EQ(hdr.Checksum(), crc);
-
   Clear();
-
-  sin.seekg(beg_pos, std::ios::beg);
+  sin.seekg(beg_pos, sin.beg);
   std::unique_ptr<std::istream> compressed_stream;
   switch (hdr.CompressType()) {
     case Compressor::kNoCompress:
@@ -126,8 +146,10 @@ void Chunk::Parse(std::istream& sin) {
     std::string buf;
     buf.resize(rec_len);
     stream.read(&buf[0], rec_len);
+    PADDLE_ENFORCE_EQ(rec_len, stream.gcount());
     Add(buf);
   }
+  return true;
 }
 
 }  // namespace recordio

paddle/fluid/recordio/chunk.h

@@ -26,9 +26,9 @@ namespace recordio {
 class Chunk {
 public:
   Chunk() : num_bytes_(0) {}
-  void Add(std::string buf) {
-    records_.push_back(buf);
+  void Add(const std::string& buf) {
     num_bytes_ += buf.size();
+    records_.emplace_back(buf);
   }
   // dump the chunk into w, and clears the chunk and makes it ready for
   // the next add invocation.
@@ -37,10 +37,15 @@ public:
     records_.clear();
     num_bytes_ = 0;
   }
-  void Parse(std::istream& sin);
-  size_t NumBytes() { return num_bytes_; }
+
+  // returns true if ok, false if eof
+  bool Parse(std::istream& sin);
+  size_t NumBytes() const { return num_bytes_; }
+  size_t NumRecords() const { return records_.size(); }
   const std::string& Record(int i) const { return records_[i]; }
 
+  bool Empty() const { return records_.empty(); }
+
 private:
   std::vector<std::string> records_;
   // sum of record lengths in bytes.

paddle/fluid/recordio/chunk_test.cc

@@ -26,7 +26,7 @@ TEST(Chunk, SaveLoad) {
   ch.Add(std::string("123", 4));
   std::stringstream ss;
   ch.Write(ss, Compressor::kNoCompress);
-  ch.Clear();
+  ss.seekg(0);
   ch.Parse(ss);
   ASSERT_EQ(ch.NumBytes(), 10U);
 }

paddle/fluid/recordio/header.cc

@@ -13,6 +13,7 @@
 // limitations under the License.
 
 #include "paddle/fluid/recordio/header.h"
+#include "paddle/fluid/platform/enforce.h"
 
 namespace paddle {
 namespace recordio {
@@ -26,23 +27,33 @@ Header::Header()
 Header::Header(uint32_t num, uint32_t sum, Compressor c, uint32_t cs)
     : num_records_(num), checksum_(sum), compressor_(c), compress_size_(cs) {}
 
-void Header::Parse(std::istream& is) {
+bool Header::Parse(std::istream& is) {
+  uint32_t magic;
+  size_t read_size =
+      is.readsome(reinterpret_cast<char*>(&magic), sizeof(uint32_t));
+  if (read_size < sizeof(uint32_t)) {
+    return false;
+  }
+  PADDLE_ENFORCE_EQ(magic, kMagicNumber);
+
   is.read(reinterpret_cast<char*>(&num_records_), sizeof(uint32_t))
       .read(reinterpret_cast<char*>(&checksum_), sizeof(uint32_t))
       .read(reinterpret_cast<char*>(&compressor_), sizeof(uint32_t))
       .read(reinterpret_cast<char*>(&compress_size_), sizeof(uint32_t));
+  return true;
 }
 
 void Header::Write(std::ostream& os) const {
-  os.write(reinterpret_cast<const char*>(&num_records_), sizeof(uint32_t))
+  os.write(reinterpret_cast<const char*>(&kMagicNumber), sizeof(uint32_t))
+      .write(reinterpret_cast<const char*>(&num_records_), sizeof(uint32_t))
       .write(reinterpret_cast<const char*>(&checksum_), sizeof(uint32_t))
       .write(reinterpret_cast<const char*>(&compressor_), sizeof(uint32_t))
       .write(reinterpret_cast<const char*>(&compress_size_), sizeof(uint32_t));
 }
 
 std::ostream& operator<<(std::ostream& os, Header h) {
-  os << h.NumRecords() << h.Checksum()
-     << static_cast<uint32_t>(h.CompressType()) << h.CompressSize();
+  os << "Header: " << h.NumRecords() << ", " << h.Checksum() << ", "
+     << static_cast<uint32_t>(h.CompressType()) << ", " << h.CompressSize();
   return os;
 }
 

paddle/fluid/recordio/header.h

@@ -19,8 +19,6 @@
 namespace paddle {
 namespace recordio {
 
-// Default ChunkSize
-constexpr size_t kDefaultMaxChunkSize = 32 * 1024 * 1024;
 // MagicNumber for memory checking
 constexpr uint32_t kMagicNumber = 0x01020304;
 
@@ -44,7 +42,9 @@ public:
   Header(uint32_t num, uint32_t sum, Compressor ct, uint32_t cs);
 
   void Write(std::ostream& os) const;
-  void Parse(std::istream& is);
+
+  // returns true if OK, false if eof
+  bool Parse(std::istream& is);
 
   uint32_t NumRecords() const { return num_records_; }
   uint32_t Checksum() const { return checksum_; }

paddle/fluid/recordio/scanner.cc

+//   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.
+
+#include "paddle/fluid/recordio/scanner.h"
+#include "paddle/fluid/platform/enforce.h"
+
+namespace paddle {
+namespace recordio {
+Scanner::Scanner(std::unique_ptr<std::istream> &&stream)
+    : stream_(std::move(stream)) {
+  Reset();
+}
+
+Scanner::Scanner(const std::string &filename) {
+  stream_.reset(new std::ifstream(filename));
+  Reset();
+}
+
+void Scanner::Reset() {
+  stream_->seekg(0, std::ios::beg);
+  ParseNextChunk();
+}
+
+std::string Scanner::Next() {
+  PADDLE_ENFORCE(!eof_, "StopIteration");
+  auto rec = cur_chunk_.Record(offset_++);
+  if (offset_ == cur_chunk_.NumRecords()) {
+    ParseNextChunk();
+  }
+  return rec;
+}
+
+void Scanner::ParseNextChunk() {
+  eof_ = !cur_chunk_.Parse(*stream_);
+  offset_ = 0;
+}
+
+bool Scanner::HasNext() const { return !eof_; }
+}  // namespace recordio
+}  // namespace paddle

paddle/fluid/recordio/scanner.h

+//   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 <fstream>
+#include <memory>
+#include "paddle/fluid/recordio/chunk.h"
+namespace paddle {
+namespace recordio {
+
+class Scanner {
+public:
+  explicit Scanner(std::unique_ptr<std::istream>&& stream);
+
+  explicit Scanner(const std::string& filename);
+
+  void Reset();
+
+  std::string Next();
+
+  bool HasNext() const;
+
+private:
+  std::unique_ptr<std::istream> stream_;
+  Chunk cur_chunk_;
+  size_t offset_;
+  bool eof_;
+
+  void ParseNextChunk();
+};
+}  // namespace recordio
+}  // namespace paddle

paddle/fluid/recordio/writer.cc

+//   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.
+#include "paddle/fluid/recordio/writer.h"
+#include "paddle/fluid/platform/enforce.h"
+namespace paddle {
+namespace recordio {
+void Writer::Write(const std::string& record) {
+  cur_chunk_.Add(record);
+  if (cur_chunk_.NumRecords() >= max_num_records_in_chunk_) {
+    Flush();
+  }
+}
+
+void Writer::Flush() {
+  cur_chunk_.Write(stream_, compressor_);
+  cur_chunk_.Clear();
+}
+
+Writer::~Writer() {
+  PADDLE_ENFORCE(cur_chunk_.Empty(), "Writer must be flushed when destroy.");
+}
+
+}  // namespace recordio
+}  // namespace paddle

paddle/fluid/recordio/writer.h

+//   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 "paddle/fluid/recordio/chunk.h"
+namespace paddle {
+namespace recordio {
+
+class Writer {
+public:
+  Writer(std::ostream* sout,
+         Compressor compressor,
+         size_t max_num_records_in_chunk = 1000)
+      : stream_(*sout),
+        max_num_records_in_chunk_(max_num_records_in_chunk),
+        compressor_(compressor) {}
+
+  void Write(const std::string& record);
+
+  void Flush();
+
+  ~Writer();
+
+private:
+  std::ostream& stream_;
+  size_t max_num_records_in_chunk_;
+  Chunk cur_chunk_;
+  Compressor compressor_;
+};
+
+}  // namespace recordio
+}  // namespace paddle

paddle/fluid/recordio/writer_scanner_test.cc

+//   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.
+
+#include "gtest/gtest.h"
+
+#include <sstream>
+#include "paddle/fluid/recordio/scanner.h"
+#include "paddle/fluid/recordio/writer.h"
+
+TEST(WriterScanner, Normal) {
+  std::stringstream* stream = new std::stringstream();
+
+  {
+    paddle::recordio::Writer writer(stream,
+                                    paddle::recordio::Compressor::kSnappy);
+    writer.Write("ABC");
+    writer.Write("BCD");
+    writer.Write("CDE");
+    writer.Flush();
+  }
+
+  {
+    stream->seekg(0, std::ios::beg);
+    std::unique_ptr<std::istream> stream_ptr(stream);
+    paddle::recordio::Scanner scanner(std::move(stream_ptr));
+    ASSERT_TRUE(scanner.HasNext());
+    ASSERT_EQ(scanner.Next(), "ABC");
+    ASSERT_EQ("BCD", scanner.Next());
+    ASSERT_TRUE(scanner.HasNext());
+    ASSERT_EQ("CDE", scanner.Next());
+    ASSERT_FALSE(scanner.HasNext());
+  }
+}
+
+TEST(WriterScanner, TinyChunk) {
+  std::stringstream* stream = new std::stringstream();
+  {
+    paddle::recordio::Writer writer(
+        stream, paddle::recordio::Compressor::kNoCompress, 2 /*max chunk num*/);
+    writer.Write("ABC");
+    writer.Write("BCD");
+    writer.Write("CDE");
+    writer.Write("DEFG");
+    writer.Flush();
+  }
+
+  {
+    stream->seekg(0, std::ios::beg);
+    std::unique_ptr<std::istream> stream_ptr(stream);
+    paddle::recordio::Scanner scanner(std::move(stream_ptr));
+    ASSERT_TRUE(scanner.HasNext());
+    ASSERT_EQ(scanner.Next(), "ABC");
+    ASSERT_EQ(scanner.Next(), "BCD");
+    ASSERT_EQ(scanner.Next(), "CDE");
+    ASSERT_EQ(scanner.Next(), "DEFG");
+    ASSERT_FALSE(scanner.HasNext());
+  }
+}
\ No newline at end of file

python/paddle/fluid/__init__.py

@@ -40,6 +40,7 @@ import clip
 from memory_optimization_transpiler import memory_optimize, release_memory
 import profiler
 import unique_name
+import recordio_writer
 
 Tensor = LoDTensor
 
@@ -66,6 +67,7 @@ __all__ = framework.__all__ + executor.__all__ + concurrency.__all__ + [
     'release_memory',
     'profiler',
     'unique_name',
+    'recordio_writer',
 ]
 
 

python/paddle/fluid/debuger.py

@@ -16,6 +16,7 @@ import sys
 import re
 from graphviz import GraphPreviewGenerator
 import proto.framework_pb2 as framework_pb2
+import paddle.fluid.core as core
 
 _vartype2str_ = [
     "UNK",
@@ -52,9 +53,11 @@ reprtpl = "{ttype} {name} ({reprs})"
 
 
 def repr_lodtensor(proto):
-    if not proto.lod_tensor: return
-    level = proto.lod_tensor.lod_level
-    reprs = repr_tensor(proto.lod_tensor.tensor)
+    if proto.type.type != framework_pb2.VarType.LOD_TENSOR:
+        return
+
+    level = proto.type.lod_tensor.lod_level
+    reprs = repr_tensor(proto.type.lod_tensor.tensor)
     return reprtpl.format(
         ttype="LoDTensor" if level > 0 else "Tensor",
         name=proto.name,
@@ -62,20 +65,24 @@ def repr_lodtensor(proto):
 
 
 def repr_selected_rows(proto):
-    if not proto.selected_rows: return
+    if proto.type.type != framework_pb2.VarType.SELECTED_ROWS:
+        return
+
     return reprtpl.format(
         ttype="SelectedRows",
         name=proto.name,
-        reprs=repr_tensor(proto.selected_rows))
+        reprs=repr_tensor(proto.type.selected_rows))
 
 
 def repr_tensor_array(proto):
-    if not proto.tensor_array: return
+    if proto.type.type != framework_pb2.VarType.LOD_TENSOR_ARRAY:
+        return
+
     return reprtpl.format(
         ttype="TensorArray",
         name=proto.name,
-        reprs="level=%d, %s" % (proto.tensor_array.lod_level,
-                                repr_tensor(proto.lod_tensor)))
+        reprs="level=%d, %s" % (proto.type.tensor_array.lod_level,
+                                repr_tensor(proto.type.lod_tensor.tensor)))
 
 
 type_handlers = [
@@ -119,6 +126,7 @@ def pprint_block_codes(block_desc, show_backward=False):
     def is_var_backward(var_desc):
         return "@GRAD" in var_desc.name
 
+    #print(type(block_desc))
     if type(block_desc) is not framework_pb2.BlockDesc:
         block_desc = framework_pb2.BlockDesc.FromString(
             block_desc.serialize_to_string())

python/paddle/fluid/io.py

@@ -47,7 +47,7 @@ def is_parameter(var):
 
 def is_persistable(var):
     if var.desc.type() == core.VarDesc.VarType.FEED_MINIBATCH or \
-       var.desc.type() == core.VarDesc.VarType.FETCH_LIST:
+            var.desc.type() == core.VarDesc.VarType.FETCH_LIST:
         return False
     return var.persistable
 

python/paddle/fluid/layers/io.py

@@ -13,11 +13,16 @@
 # limitations under the License.
 
 from .. import core
-from ..layer_helper import LayerHelper
+from ..framework import convert_np_dtype_to_dtype_, default_main_program, default_startup_program
+from ..unique_name import generate as unique_name
 from control_flow import BlockGuard
 from ..layer_helper import LayerHelper
+from ..executor import global_scope
 
-__all__ = ['data', 'BlockGuardServ', 'ListenAndServ', 'Send']
+__all__ = [
+    'data', 'BlockGuardServ', 'ListenAndServ', 'Send', 'open_recordio_file',
+    'read_file'
+]
 
 
 def data(name,
@@ -224,3 +229,72 @@ def Recv(endpoints, get_vars):
         outputs={"Out": get_vars},
         attrs={"endpoints": endpoints,
                "epmap": epmap})
+
+
+def monkey_patch_reader_methods(reader):
+    def __get_reader__():
+        scope = global_scope()
+        var = scope.find_var(reader.name)
+        return var.get_reader()
+
+    def eof():
+        return not __get_reader__().has_next()
+
+    def reset():
+        return __get_reader__().reset()
+
+    reader.eof = eof
+    reader.reset = reset
+    return reader
+
+
+def _copy_reader_var_(block, var):
+    new_var = block.create_var(name=var.name, type=core.VarDesc.VarType.READER)
+    new_var.desc.set_shapes(var.desc.shapes())
+    new_var.desc.set_dtypes(var.desc.dtypes())
+    new_var.persistable = True
+    return monkey_patch_reader_methods(new_var)
+
+
+def open_recordio_file(filename, shapes, lod_levels, dtypes):
+    dtypes = [convert_np_dtype_to_dtype_(dt) for dt in dtypes]
+    shape_concat = []
+    ranks = []
+
+    for shape in shapes:
+        shape_concat.extend(shape)
+        ranks.append(len(shape))
+
+    var_name = unique_name('open_recordio_file')
+
+    startup_blk = default_startup_program().current_block()
+    startup_var = startup_blk.create_var(name=var_name)
+    startup_blk.append_op(
+        type='create_recordio_file_reader',
+        outputs={'Out': [startup_var]},
+        attrs={
+            'shape_concat': shape_concat,
+            'lod_levels': lod_levels,
+            'filename': filename,
+            'ranks': ranks
+        })
+
+    startup_var.desc.set_dtypes(dtypes)
+    startup_var.persistable = True
+    return _copy_reader_var_(default_main_program().current_block(),
+                             startup_var)
+
+
+def read_file(file_obj):
+    helper = LayerHelper('read_file')
+    out = [
+        helper.create_tmp_variable(
+            stop_gradient=True, dtype='float32')
+        for _ in range(len(file_obj.desc.shapes()))
+    ]
+    helper.append_op(
+        type='read', inputs={'Reader': [file_obj]}, outputs={'Out': out})
+    if len(out) == 1:
+        return out[0]
+    else:
+        return out

python/paddle/fluid/recordio_writer.py

+#   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.
+
+import core
+import contextlib
+
+__all__ = ['convert_reader_to_recordio_file']
+
+
+@contextlib.contextmanager
+def create_recordio_writer(filename,
+                           compressor=core.RecordIOWriter.Compressor.Snappy,
+                           max_num_records=1000):
+    writer = core.RecordIOWriter(filename, compressor, max_num_records)
+    yield writer
+    writer.close()
+
+
+def convert_reader_to_recordio_file(
+        filename,
+        reader_creator,
+        feeder,
+        compressor=core.RecordIOWriter.Compressor.Snappy,
+        max_num_records=1000,
+        feed_order=None):
+    if feed_order is None:
+        feed_order = feeder.feed_names
+    with create_recordio_writer(filename, compressor,
+                                max_num_records) as writer:
+        for batch in reader_creator():
+            res = feeder.feed(batch)
+            for each in feed_order:
+                writer.append_tensor(res[each])
+            writer.complete_append_tensor()

python/paddle/fluid/tests/unittests/.gitignore

+mnist.recordio

python/paddle/fluid/tests/unittests/test_debugger.py

+#   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.
+
+import unittest
+import paddle.fluid as fluid
+import paddle.fluid.core as core
+from paddle.fluid import debuger
+from paddle.fluid.framework import Program
+
+
+class TestDebugger(unittest.TestCase):
+    def test_debug_str(self):
+        p = Program()
+        b = p.current_block()
+
+        #selected_rows
+        b.create_var(
+            name='selected_rows',
+            dtype="float32",
+            shape=[5, 10],
+            type=core.VarDesc.VarType.SELECTED_ROWS)
+
+        #tensor array
+        b.create_var(
+            name='tensor_array',
+            shape=[5, 10],
+            type=core.VarDesc.VarType.LOD_TENSOR_ARRAY)
+
+        #operator
+        mul_x = b.create_parameter(
+            dtype="float32", shape=[5, 10], lod_level=0, name="mul.x")
+        mul_y = b.create_var(
+            dtype="float32", shape=[10, 8], lod_level=0, name="mul.y")
+        mul_out = b.create_var(
+            dtype="float32", shape=[5, 8], lod_level=0, name="mul.out")
+        b.append_op(
+            type="mul",
+            inputs={"X": mul_x,
+                    "Y": mul_y},
+            outputs={"Out": mul_out},
+            attrs={"x_num_col_dims": 1})
+
+        print(debuger.pprint_program_codes(p.desc))
+
+
+if __name__ == '__main__':
+    unittest.main()

python/paddle/fluid/tests/unittests/test_recordio_reader.py

+#   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.
+
+import unittest
+import paddle.fluid as fluid
+import paddle.v2.dataset.mnist as mnist
+import paddle.v2 as paddle
+
+
+class TestRecordIO(unittest.TestCase):
+    def setUp(self):
+        # Convert mnist to recordio file
+        with fluid.program_guard(fluid.Program(), fluid.Program()):
+            reader = paddle.batch(mnist.train(), batch_size=32)
+            feeder = fluid.DataFeeder(
+                feed_list=[  # order is image and label
+                    fluid.layers.data(
+                        name='image', shape=[784]),
+                    fluid.layers.data(
+                        name='label', shape=[1], dtype='int64'),
+                ],
+                place=fluid.CPUPlace())
+            fluid.recordio_writer.convert_reader_to_recordio_file(
+                './mnist.recordio', reader, feeder)
+
+    def test_main(self):
+        # use new program
+        with fluid.program_guard(fluid.Program(), fluid.Program()):
+            data_file = fluid.layers.open_recordio_file(
+                './mnist.recordio',
+                shapes=[[-1, 784], [-1, 1]],
+                lod_levels=[0, 0],
+                dtypes=['float32', 'int64'])
+            img, label = fluid.layers.read_file(data_file)
+
+            hidden = fluid.layers.fc(input=img, size=100, act='tanh')
+            prediction = fluid.layers.fc(input=hidden, size=10, act='softmax')
+            loss = fluid.layers.cross_entropy(input=prediction, label=label)
+            avg_loss = fluid.layers.mean(loss)
+
+            fluid.optimizer.Adam(learning_rate=1e-3).minimize(avg_loss)
+
+            exe = fluid.Executor(fluid.CPUPlace())
+            exe.run(fluid.default_startup_program())
+            avg_loss_np = []
+
+            # train a pass
+            while not data_file.eof():
+                tmp, = exe.run(fetch_list=[avg_loss])
+                avg_loss_np.append(tmp)
+            data_file.reset()
+
+            self.assertLess(avg_loss_np[-1], avg_loss_np[0])