Python trainer api (#193)

* Python trainer API and demo

* Adding missing PaddleAPIPrivate.h

* Adding api_train.sh

* More comments

* Bump up patch version to 0b3

CMakeLists.txt

@@ -3,7 +3,7 @@ cmake_minimum_required(VERSION 2.8)
 project(paddle CXX C)
 set(PADDLE_MAJOR_VERSION 0)
 set(PADDLE_MINOR_VERSION 8)
-set(PADDLE_PATCH_VERSION 0b2)
+set(PADDLE_PATCH_VERSION 0b3)
 set(PADDLE_VERSION ${PADDLE_MAJOR_VERSION}.${PADDLE_MINOR_VERSION}.${PADDLE_PATCH_VERSION})
 
 set(CMAKE_MODULE_PATH ${CMAKE_MODULE_PATH} "${CMAKE_SOURCE_DIR}/cmake")

cmake/swig.cmake

@@ -27,6 +27,7 @@ function(generate_python_api target_name)
         COMMAND swig -python -c++ -outcurrentdir -I../ api/Paddle.swig
                 && mv ${PROJ_ROOT}/paddle/swig_paddle.py ${PROJ_ROOT}/paddle/py_paddle/swig_paddle.py
         DEPENDS ${PROJ_ROOT}/paddle/api/Paddle.swig
+                ${PROJ_ROOT}/paddle/api/PaddleAPI.h
         WORKING_DIRECTORY ${PROJ_ROOT}/paddle
         COMMENT "Generate Python API from swig")
     add_custom_target(${target_name} ALL DEPENDS

demo/quick_start/api_train.py

+# Copyright (c) 2016 Baidu, Inc. 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 argparse
+import itertools
+import random
+
+from paddle.trainer.config_parser import parse_config
+from py_paddle import swig_paddle as api
+from py_paddle import DataProviderConverter
+from paddle.trainer.PyDataProvider2 \
+    import integer_value, integer_value_sequence, sparse_binary_vector
+
+def parse_arguments():
+    parser = argparse.ArgumentParser()
+    parser.add_argument("--train_data",
+                        type=str, required=False, help="train data file")
+    parser.add_argument("--test_data", type=str, help="test data file")
+    parser.add_argument("--config",
+                        type=str, required=True, help="config file name")
+    parser.add_argument("--dict_file", required=True, help="dictionary file")
+    parser.add_argument("--seq",
+                        default=1, type=int,
+                        help="whether use sequence training")
+    parser.add_argument("--use_gpu", default=0, type=int,
+                        help="whether use GPU for training")
+    parser.add_argument("--trainer_count", default=1, type=int,
+                        help="Number of threads for training")
+    parser.add_argument("--num_passes", default=5, type=int,
+                        help="Number of training passes")
+    return parser.parse_args()
+
+UNK_IDX = 0
+
+def load_data(file_name, word_dict):
+    with open(file_name, 'r') as f:
+        for line in f:
+            label, comment = line.strip().split('\t')
+            words = comment.split()
+            word_slot = [word_dict.get(w, UNK_IDX) for w in words]
+            yield word_slot, int(label)
+
+def load_dict(dict_file):
+    word_dict = dict()
+    with open(dict_file, 'r') as f:
+        for i, line in enumerate(f):
+            w = line.strip().split()[0]
+            word_dict[w] = i
+    return word_dict
+
+def main():
+    options = parse_arguments()
+    api.initPaddle("--use_gpu=%s" % options.use_gpu,
+                   "--trainer_count=%s" % options.trainer_count)
+
+    word_dict = load_dict(options.dict_file)
+    train_dataset = list(load_data(options.train_data, word_dict))
+    if options.test_data:
+        test_dataset = list(load_data(options.test_data, word_dict))
+    else:
+        test_dataset = None
+
+    trainer_config = parse_config(options.config,
+                                  "dict_file=%s" % options.dict_file)
+    # No need to have data provider for trainer
+    trainer_config.ClearField('data_config')
+    trainer_config.ClearField('test_data_config')
+
+    # create a GradientMachine from the model configuratin
+    model = api.GradientMachine.createFromConfigProto(
+        trainer_config.model_config)
+    # create a trainer for the gradient machine
+    trainer = api.Trainer.create(trainer_config, model)
+
+    # create a data converter which converts data to PaddlePaddle
+    # internal format
+    input_types = [
+        integer_value_sequence(len(word_dict)) if options.seq
+            else sparse_binary_vector(len(word_dict)),
+        integer_value(2)]
+    converter = DataProviderConverter(input_types)
+
+    batch_size = trainer_config.opt_config.batch_size
+    trainer.startTrain()
+    for train_pass in xrange(options.num_passes):
+        trainer.startTrainPass()
+        random.shuffle(train_dataset)
+        for pos in xrange(0, len(train_dataset), batch_size):
+            batch = itertools.islice(train_dataset, pos, pos + batch_size)
+            size = min(batch_size, len(train_dataset) - pos)
+            trainer.trainOneDataBatch(size, converter(batch))
+        trainer.finishTrainPass()
+        if test_dataset:
+            trainer.startTestPeriod();
+            for pos in xrange(0, len(test_dataset), batch_size):
+                batch = itertools.islice(test_dataset, pos, pos + batch_size)
+                size = min(batch_size, len(test_dataset) - pos)
+                trainer.testOneDataBatch(size, converter(batch))
+            trainer.finishTestPeriod()
+    trainer.finishTrain()
+
+if __name__ == '__main__':
+    main()

demo/quick_start/api_train.sh

+#!/bin/bash
+# Copyright (c) 2016 Baidu, Inc. 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.
+set -e
+
+# Note: if using trainer_config.emb.py, trainer_config.cnn.py
+# or trainer_config.lstm.py, you need to change --seq to --seq=1
+# because they are sequence models.
+python api_train.py \
+  --config=trainer_config.lr.py \
+  --trainer_count=2 \
+  --num_passes=15 \
+  --use_gpu=0 \
+  --seq=0 \
+  --train_data=data/train.txt \
+  --test_data=data/test.txt \
+  --dict_file=data/dict.txt \
+  2>&1 | tee 'train.log'

demo/quick_start/train.sh

@@ -24,7 +24,7 @@ paddle train \
   --config=$cfg \
   --save_dir=./output \
   --trainer_count=4 \
-  --log_period=20 \
+  --log_period=100 \
   --num_passes=15 \
   --use_gpu=false \
   --show_parameter_stats_period=100 \

demo/quick_start/trainer_config.lr.py

@@ -16,7 +16,7 @@
 
 from paddle.trainer_config_helpers import *
 
-dict_file = "./data/dict.txt"
+dict_file = get_config_arg('dict_file', str, "./data/dict.txt")
 word_dict = dict()
 with open(dict_file, 'r') as f:
     for i, line in enumerate(f):
@@ -63,7 +63,6 @@ if not is_predict:
     label = data_layer(name="label", size=2)
 
     # Define cross-entropy classification loss and error.
-    classification_cost(input=output, label=label)
     cls = classification_cost(input=output, label=label)
     outputs(cls)
 else:

demo/sentiment/predict.py

@@ -46,8 +46,8 @@ class SentimentPrediction():
         conf = parse_config(train_conf, "is_predict=1")
         self.network = swig_paddle.GradientMachine.createFromConfigProto(conf.model_config)
         self.network.loadParameters(self.model_dir)
-        slots = [integer_value_sequence(self.dict_dim)]
-        self.converter = DataProviderConverter(slots)
+        input_types = [integer_value_sequence(self.dict_dim)]
+        self.converter = DataProviderConverter(input_types)
 
     def load_dict(self):
         """

paddle/api/Arguments.cpp

@@ -14,27 +14,10 @@ limitations under the License. */
 
 
 #include "PaddleAPI.h"
+#include "PaddleAPIPrivate.h"
 
 #include "paddle/parameter/Argument.h"
 
-struct ArgumentsPrivate {
-  std::vector<paddle::Argument> outputs;
-
-  inline paddle::Argument& getArg(size_t idx) throw(RangeError) {
-    if (idx < outputs.size()) {
-      return outputs[idx];
-    } else {
-      RangeError e;
-      throw e;
-    }
-  }
-
-  template <typename T>
-  std::shared_ptr<T>& cast(void* rawPtr) const {
-    return *(std::shared_ptr<T>*)(rawPtr);
-  }
-};
-
 size_t Arguments::getSlotNum() const { return m->outputs.size(); }
 
 Arguments* Arguments::createArguments(size_t slotNum) {

paddle/api/CMakeLists.txt

@@ -40,6 +40,8 @@ configure_file(
 
 generate_python_api(python_swig_sources)
 
+file(GLOB PY_PADDLE_PYTHON_FILES ${PROJ_ROOT}/paddle/py_paddle/*.py)
+
 # TODO(yuyang18) : make wheel name calculated by cmake
 add_custom_command(OUTPUT ${PROJ_ROOT}/paddle/dist/.timestamp
     COMMAND ${PYTHON_EXECUTABLE} setup.py  bdist_wheel
@@ -55,6 +57,7 @@ add_custom_command(OUTPUT ${PROJ_ROOT}/paddle/dist/.timestamp
             paddle_trainer
             paddle_api
             paddle_cuda
+	    ${PY_PADDLE_PYTHON_FILES}
 )
 
 install(DIRECTORY ${PROJ_ROOT}/paddle/dist/

paddle/api/ConfigParser.cpp

@@ -14,17 +14,9 @@ limitations under the License. */
 
 
 #include "PaddleAPI.h"
+#include "PaddleAPIPrivate.h"
 #include "paddle/trainer/Trainer.h"
 
-struct TrainerConfigPrivate {
-  std::shared_ptr<paddle::TrainerConfig> conf;
-  TrainerConfigPrivate() : conf(std::make_shared<paddle::TrainerConfig>()) {}
-};
-
-struct ModelConfigPrivate {
-  std::shared_ptr<paddle::TrainerConfig> conf;
-};
-
 struct ParameterConfigPrivate {
   paddle::ParameterPtr parameter;
   paddle::ParameterConfig config;
@@ -39,19 +31,6 @@ struct ParameterConfigPrivate {
   }
 };
 
-struct OptimizationConfigPrivate {
-  std::shared_ptr<paddle::TrainerConfig> trainer_config;
-  paddle::OptimizationConfig config;
-
-  paddle::OptimizationConfig& getConfig() {
-    if (trainer_config != nullptr) {
-      return *trainer_config->mutable_opt_config();
-    } else {
-      return config;
-    }
-  }
-};
-
 TrainerConfig::TrainerConfig() : m(new TrainerConfigPrivate()) {}
 
 TrainerConfig::~TrainerConfig() { delete m; }
@@ -59,10 +38,19 @@ TrainerConfig::~TrainerConfig() { delete m; }
 TrainerConfig* TrainerConfig::createFromTrainerConfigFile(
     const std::string& confPath) {
   LOG(INFO) << "load trainer config from " << confPath;
-  paddle::TrainerConfigHelper helper(confPath);
-  //! TODO(yuyang18): Make TrainerConfigPrivate to TrainerConfigHelper
+  auto conf = std::make_shared<paddle::TrainerConfigHelper>(confPath);
   auto retv = new TrainerConfig();
-  *retv->m->conf = helper.getConfig();
+  retv->m->conf = conf;
+  return retv;
+}
+
+TrainerConfig* TrainerConfig::createFromProtoString(
+    const std::string& str) {
+  auto retv = new TrainerConfig();
+  paddle::TrainerConfig trainerConfigProto;
+  auto conf = std::make_shared<paddle::TrainerConfigHelper>(trainerConfigProto);
+  CHECK(conf->getMutableConfig().ParseFromString(str));
+  retv->m->conf = conf;
   return retv;
 }
 
@@ -76,10 +64,6 @@ ModelConfig* TrainerConfig::getModelConfig() const {
   return retv;
 }
 
-void* ModelConfig::getPaddleModelConfig() const {
-  return m->conf->mutable_model_config();
-}
-
 ParameterConfig::ParameterConfig() : m(new ParameterConfigPrivate()) {}
 
 ParameterConfig::~ParameterConfig() {
@@ -132,8 +116,6 @@ OptimizationConfig* TrainerConfig::getOptimizationConfig() const {
   return opt_config;
 }
 
-void* OptimizationConfig::getRawPtr() { return &m->getConfig(); }
-
 OptimizationConfig* OptimizationConfig::createFromProtoString(
     const std::string& str) {
   auto conf = new OptimizationConfig();

paddle/api/GradientMachine.cpp

@@ -14,30 +14,22 @@ limitations under the License. */
 
 
 #include "PaddleAPI.h"
-#include "paddle/gserver/gradientmachines/GradientMachine.h"
+#include "PaddleAPIPrivate.h"
+
 #include "paddle/gserver/gradientmachines/NeuralNetwork.h"
 #include "Internal.h"
 
 std::vector<int> GradientMachine::defaultParamTypes = {
     PARAMETER_VALUE, PARAMETER_GRADIENT, PARAMETER_MOMENTUM};
 
-struct GradientMachinePrivate {
-  std::shared_ptr<paddle::GradientMachine> machine;
-
-  template <typename T>
-  inline T& cast(void* ptr) {
-    return *(T*)(ptr);
-  }
-};
-
 GradientMachine::GradientMachine() : m(new GradientMachinePrivate()) {}
 
 GradientMachine::~GradientMachine() { delete m; }
 
 GradientMachine* GradientMachine::createFromPaddleModelPtr(
-    void* confPtr, GradientMatchineCreateMode mode,
+    const void* confPtr, GradientMatchineCreateMode mode,
     const std::vector<int>& types) {
-  auto& conf = *(paddle::ModelConfig*)(confPtr);
+  auto& conf = *(const paddle::ModelConfig*)(confPtr);
   std::vector<ParameterType> realTypes;
   staticCastVector(&realTypes, types);
   auto machineRawPtr = paddle::GradientMachine::create(conf, mode, realTypes);
@@ -66,7 +58,7 @@ GradientMachine* GradientMachine::createByConfigProtoStr(
 GradientMachine* GradientMachine::createByModelConfig(
     ModelConfig* conf, GradientMatchineCreateMode mode,
     const std::vector<int>& types) {
-  auto confPtr = (paddle::ModelConfig*)conf->getPaddleModelConfig();
+  auto confPtr = &conf->m->conf->getModelConfig();
   return GradientMachine::createFromPaddleModelPtr(confPtr, mode, types);
 }
 

paddle/api/PaddleAPI.h

@@ -446,7 +446,6 @@ struct OptimizationConfigPrivate;
 class OptimizationConfig {
   DISABLE_COPY_AND_ASSIGN(OptimizationConfig);
   OptimizationConfig();
-  void* getRawPtr();
 
 public:
   static OptimizationConfig* createFromProtoString(const std::string& str);
@@ -462,6 +461,7 @@ private:
 
   friend class TrainerConfig;
   friend class ParameterOptimizer;
+  friend class Trainer;
 };
 
 struct ParameterPrivate;
@@ -515,8 +515,6 @@ public:
   virtual ~ModelConfig();
 
 private:
-  void* getPaddleModelConfig() const;
-
   ModelConfigPrivate* m;
   friend class TrainerConfig;
   friend struct TrainerConfigPrivate;
@@ -539,6 +537,7 @@ public:
 
   static TrainerConfig* createFromTrainerConfigFile(
       const std::string& configPath);
+  static TrainerConfig* createFromProtoString(const std::string& str);
 
   ModelConfig* getModelConfig() const;
 
@@ -546,6 +545,7 @@ public:
 
 private:
   TrainerConfigPrivate* m;
+  friend class Trainer;
 };
 
 /**
@@ -700,11 +700,12 @@ private:
   GradientMachinePrivate* m;
 
   static GradientMachine* createFromPaddleModelPtr(
-      void* confPtr, GradientMatchineCreateMode mode,
+      const void* confPtr, GradientMatchineCreateMode mode,
       const std::vector<int>& types);
 
   // Not to use c++ 11 init-list, so we use static var as function default arg.
   static std::vector<int> defaultParamTypes;
+  friend class Trainer;
 };
 
 struct TrainerPrivate;
@@ -712,6 +713,7 @@ class Trainer {
 private:
   TrainerPrivate* m;
   Trainer();
+  Trainer(TrainerConfig* optConfig, GradientMachine* gm);
   DISABLE_COPY_AND_ASSIGN(Trainer);
 
 public:
@@ -720,38 +722,42 @@ public:
   /// Create A Trainer By TrainerConfig. using paddle command line.
   static Trainer* createByCommandLine() throw(IOError);
 
-  /// Start Train.
+  static Trainer* create(TrainerConfig* optConfig, GradientMachine* gm)
+      throw(IOError);
+
+  /// Start training
   void startTrain();
+
+  /// Finish training
   void finishTrain();
 
-  /// Start Pass.
+  /// Start a pass.
   void startTrainPass();
-  void finishTrainPass();
 
-  void setBatchSize(size_t batchSize);
+  /// Finish a pass
+  void finishTrainPass();
 
   /**
    * Train one batch,
    *
-   * @param batchSize -1 wiil use command line or batch size set before,
-   *                  otherwise use this batchSize for train.
-   *
    * @return true if all batch finished.
    */
-  bool trainOneBatch(size_t batchSize = -1UL);
+  bool trainOneBatch(size_t batchSize);
 
-  bool prepareBatchData(size_t batchSize = -1UL);
+  void trainOneDataBatch(size_t batchSize, const Arguments& args);
 
-  void finishTrainOneBatch();
+  void startTestPeriod();
+  void testOneDataBatch(size_t batchSize, const Arguments& args);
+  void finishTestPeriod();
 
-  void forwardOneBatch() throw(UnsupportError);
+  void forwardOneBatch(size_t batchSize);
 
-  Arguments* getNetworkOutput();
+  Arguments* getForwardOutput();
 
   Matrix* getLayerOutput(const std::string& layerName);
 };
 
-/// The N-Best results generated from one input sequence.
+/// the N-Best results generated from one input sequence.
 class ISequenceResults {
 public:
   virtual ~ISequenceResults();

paddle/api/PaddleAPIPrivate.h

+/* Copyright (c) 2016 Baidu, Inc. All Rights Reserve.
+
+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/gserver/gradientmachines/GradientMachine.h"
+#include "paddle/trainer/TrainerConfigHelper.h"
+
+#pragma once
+
+struct GradientMachinePrivate {
+  std::shared_ptr<paddle::GradientMachine> machine;
+
+  template <typename T>
+  inline T& cast(void* ptr) {
+    return *(T*)(ptr);
+  }
+};
+
+struct OptimizationConfigPrivate {
+  std::shared_ptr<paddle::TrainerConfigHelper> trainer_config;
+  paddle::OptimizationConfig config;
+
+  const paddle::OptimizationConfig& getConfig() {
+    if (trainer_config != nullptr) {
+      return trainer_config->getOptConfig();
+    } else {
+      return config;
+    }
+  }
+};
+
+struct TrainerConfigPrivate {
+  std::shared_ptr<paddle::TrainerConfigHelper> conf;
+  TrainerConfigPrivate() {}
+};
+
+struct ModelConfigPrivate {
+  std::shared_ptr<paddle::TrainerConfigHelper> conf;
+};
+
+struct ArgumentsPrivate {
+  std::vector<paddle::Argument> outputs;
+
+  inline paddle::Argument& getArg(size_t idx) throw(RangeError) {
+    if (idx < outputs.size()) {
+      return outputs[idx];
+    } else {
+      RangeError e;
+      throw e;
+    }
+  }
+
+  template <typename T>
+  std::shared_ptr<T>& cast(void* rawPtr) const {
+    return *(std::shared_ptr<T>*)(rawPtr);
+  }
+};
+

paddle/api/ParameterOptimizer.cpp

@@ -14,6 +14,7 @@ limitations under the License. */
 
 
 #include "PaddleAPI.h"
+#include "PaddleAPIPrivate.h"
 #include "paddle/parameter/ParameterOptimizer.h"
 #include "Internal.h"
 #include <algorithm>
@@ -60,10 +61,9 @@ ParameterOptimizer::~ParameterOptimizer() {
 
 ParameterOptimizer* ParameterOptimizer::create(OptimizationConfig* config) {
   CHECK(config != nullptr);
-  auto opt_config_ptr = (paddle::OptimizationConfig*)config->getRawPtr();
   auto retOptimizer = new ParameterOptimizer();
   retOptimizer->m->optimizer.reset(
-      paddle::ParameterOptimizer::create(*opt_config_ptr, false));
+      paddle::ParameterOptimizer::create(config->m->getConfig(), false));
   return retOptimizer;
 }
 

paddle/api/Trainer.cpp

@@ -13,6 +13,7 @@ See the License for the specific language governing permissions and
 limitations under the License. */
 
 #include "PaddleAPI.h"
+#include "PaddleAPIPrivate.h"
 
 #include <stdlib.h>
 #include <memory>
@@ -30,31 +31,17 @@ P_DECLARE_string(config);
 P_DECLARE_string(init_model_path);
 P_DECLARE_int32(start_pass);
 
-struct TrainPassContext {
-  int64_t batchId;
-  int32_t batchSize;
-  real avgTestCost;
-  int64_t numAvgTests;
-  int passInnerId;
-  paddle::DataBatch data;
-  std::vector<paddle::Argument> forwardOutput;
-};
-
 struct TrainerPrivate : public paddle::Trainer {
-  void startTrain();
-  void finishTrain();
-
-  void startTrainPass();
-  void finishTrainPass();
-
-  bool _trainOneBatch();
-
-  bool _prepareBatchData();
-  void _forwardOneBatch() throw(UnsupportError);
-
+  bool _trainOneBatch(size_t batchSize);
+  bool forwardOneBatch(size_t batchSize);
+  void forwardOneDataBatch(const std::vector<paddle::Argument>& inArgs);
+  void setBatchSize(size_t batchSize);
+  std::vector<paddle::Argument>& getForwardOutput();
+
+  void startTestPeriod();
+  void finishTestPeriod();
+  void testOneDataBatch(const paddle::DataBatch& dataBatch);
   TrainerPrivate() : paddle::Trainer() {}
-
-  TrainPassContext trainPassContext;
 };
 
 Trainer::Trainer() : m(new TrainerPrivate()) {
@@ -75,61 +62,76 @@ Trainer* Trainer::createByCommandLine() throw(IOError) {
   }
 }
 
-void Trainer::startTrain() { m->startTrain(); }
+Trainer::Trainer(TrainerConfig* config, GradientMachine* gm)
+    : m(new TrainerPrivate()) {
+  m->init(config->m->conf, /* testing= */false, gm ? gm->m->machine : nullptr);
+}
 
-void TrainerPrivate::startTrain() {
-  srand(this->config_->getConfig().start_pass() + 1);
-  this->dataProvider_->reset();
-  this->trainerInternal_.getGradientMachine()->start(*config_, dataProvider_);
+Trainer* Trainer::create(TrainerConfig* config, GradientMachine* gm)
+    throw(IOError)
+{
+  auto retv = new Trainer(config, gm);
+  if (retv->m->getConfig().IsInitialized()) {
+    return retv;
+  } else {
+    retv->m->getConfig().CheckInitialized();
+    throw IOError();
+  }
 }
 
-void Trainer::finishTrain() { m->finishTrain(); }
+void Trainer::startTrain() { m->startTrain(); }
 
-void TrainerPrivate::finishTrain() {
-  this->trainerInternal_.getGradientMachine()->finish();
-}
+void Trainer::finishTrain() { m->finishTrain(); }
 
 void Trainer::startTrainPass() { m->startTrainPass(); }
 
-void TrainerPrivate::startTrainPass() {
-  this->stats_.reset();
-  this->trainPassContext.batchId = 0;
-  this->trainPassContext.batchSize = this->config_->getOptConfig().batch_size();
-  this->trainPassContext.avgTestCost = 0;
-  this->trainPassContext.numAvgTests = 0;
-  this->trainPassContext.passInnerId = 0;
-  this->trainerInternal_.getParameterUpdater()->startPass();
-  this->evaluator_->start();
-}
-
 void Trainer::finishTrainPass() { m->finishTrainPass(); }
 
-void TrainerPrivate::finishTrainPass() {
-  this->trainerInternal_.getGradientMachine()->onPassEnd();
-  this->trainerInternal_.getParameterUpdater()->finishPass();
-  evaluator_->finish();
+void Trainer::trainOneDataBatch(size_t batchSize, const Arguments& inArgs) {
+  paddle::DataBatch dataBatch;
+  dataBatch.getStreams() = inArgs.m->outputs;
+  dataBatch.setSize(batchSize);
+  m->trainOneDataBatch(dataBatch);
 }
 
-void Trainer::setBatchSize(size_t batchSize) {
-  this->m->trainPassContext.batchSize = batchSize;
+bool Trainer::trainOneBatch(size_t batchSize) {
+  return m->_trainOneBatch(batchSize);
 }
 
-bool Trainer::trainOneBatch(size_t batchSize) {
-  if (batchSize == -1UL) {
-    this->setBatchSize(batchSize);
+bool TrainerPrivate::_trainOneBatch(size_t batchSize) {
+  paddle::DataBatch dataBatch;
+  CHECK(dataProvider_) << "data_provider is not specified";
+  int num = dataProvider_->getNextBatch(batchSize, &dataBatch);
+  if (num == 0) {
+    return false;
   }
-  return m->_trainOneBatch();
+  trainOneDataBatch(dataBatch);
+  return false;
 }
 
-bool TrainerPrivate::_trainOneBatch() {
-  if (this->_prepareBatchData()) {
-    return true;
+void TrainerPrivate::startTestPeriod() {
+  if (!tester_) {
+    createTester();
   }
-  this->trainerInternal_.trainOneBatch(this->trainPassContext.batchId,
-                                       this->trainPassContext.data);
-  return false;
+  tester_->startTestPeriod();
 }
 
+void Trainer::startTestPeriod() { m->startTestPeriod(); }
+
+void TrainerPrivate::testOneDataBatch(const paddle::DataBatch& dataBatch) {
+  tester_->testOneDataBatch(dataBatch, &forwardOutput_);
+}
+
+void Trainer::testOneDataBatch(size_t batchSize, const Arguments& args) {
+  paddle::DataBatch dataBatch;
+  dataBatch.getStreams() = args.m->outputs;
+  dataBatch.setSize(batchSize);
+  m->testOneDataBatch(dataBatch);
+}
+
+void TrainerPrivate::finishTestPeriod() { tester_->finishTestPeriod(); }
+void Trainer::finishTestPeriod() { m->finishTestPeriod(); }
+
 Matrix* Trainer::getLayerOutput(const std::string& layerName) {
   auto nn = std::dynamic_pointer_cast<paddle::NeuralNetwork>(
           this->m->getGradientMachine());
@@ -138,46 +140,37 @@ Matrix* Trainer::getLayerOutput(const std::string& layerName) {
   return Matrix::createByPaddleMatrixPtr(&m);
 }
 
-bool Trainer::prepareBatchData(size_t batchSize) {
-  if (batchSize != -1UL) {
-    this->setBatchSize(batchSize);
+void Trainer::forwardOneBatch(size_t batchSize) { m->forwardOneBatch(batchSize); }
+
+bool TrainerPrivate::forwardOneBatch(size_t batchSize)  {
+  CHECK(dataProvider_) << "data_provider is not specified";
+  paddle::DataBatch dataBatch;
+  int num = dataProvider_->getNextBatch(batchSize, &dataBatch);
+  if (num == 0) {
+    return false;
   }
-  return this->m->_prepareBatchData();
-}
 
-bool TrainerPrivate::_prepareBatchData() {
-  int num = dataProvider_->getNextBatch(this->trainPassContext.batchSize,
-                                        &this->trainPassContext.data);
-  return num == 0;
+  forwardOneDataBatch(dataBatch.getStreams());
+  return true;
 }
 
-void Trainer::finishTrainOneBatch() { ++m->trainPassContext.batchId; }
-
-void Trainer::forwardOneBatch() throw(UnsupportError) { m->_forwardOneBatch(); }
+void TrainerPrivate::forwardOneDataBatch(
+    const std::vector<paddle::Argument>& inArgs) {
 
-void TrainerPrivate::_forwardOneBatch() throw(UnsupportError) {
-  auto& dataBatch = this->trainPassContext.data;
-
-  int64_t actualBatchSize = dataBatch.getSize();
-  if (actualBatchSize == 0) {
-    return;
-  }
-
-  const std::vector<paddle::Argument>& inArgs = dataBatch.getStreams();
-  std::vector<paddle::Argument>& outArgs = this->trainPassContext.forwardOutput;
-  outArgs.clear();
-  paddle::PassType passType =
-      this->trainerInternal_.getParameterUpdater()->startBatch(actualBatchSize);
+  std::vector<paddle::Argument>& outArgs = forwardOutput_;
 
   if (config_->getOptConfig().use_sparse_remote_updater()) {
-    this->trainerInternal_.getGradientMachine()->prefetch(inArgs);
-    this->trainerInternal_.getParameterUpdater()->getParametersRemote();
+    trainerInternal_.getGradientMachine()->prefetch(inArgs);
+    trainerInternal_.getParameterUpdater()->getParametersRemote();
   }
-  this->trainerInternal_.getGradientMachine()->forward(
-        inArgs, &outArgs, passType);
+  trainerInternal_.getGradientMachine()->forward(
+      inArgs, &outArgs, paddle::PASS_TEST);
+}
+
+Arguments* Trainer::getForwardOutput() {
+  return Arguments::createByPaddleArgumentVector(&m->getForwardOutput());
 }
 
-Arguments* Trainer::getNetworkOutput() {
-  return Arguments::createByPaddleArgumentVector(
-      &m->trainPassContext.forwardOutput);
+std::vector<paddle::Argument>& TrainerPrivate::getForwardOutput() {
+  return forwardOutput_;
 }

paddle/api/test/run_tests.sh

@@ -30,7 +30,7 @@ source .test_env/bin/activate
 
 pip --timeout 600  install ../../dist/*.whl
 
-test_list="testArguments.py testGradientMachine.py testMatrix.py  testVector.py testTrain.py"
+test_list="testArguments.py testGradientMachine.py testMatrix.py  testVector.py testTrain.py testTrainer.py"
 
 export PYTHONPATH=$PWD/../../../python/
 

paddle/api/test/testTrain.py

@@ -12,9 +12,8 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-from py_paddle import swig_paddle, DataProviderWrapperConverter
+from py_paddle import swig_paddle
 import paddle.trainer.config_parser
-from paddle.trainer.PyDataProviderWrapper import DenseSlot, IndexSlot
 import numpy
 import util
 

paddle/api/test/testTrainer.py

+# Copyright (c) 2016 Baidu, Inc. 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.
+
+from paddle.trainer.config_parser import parse_config
+from paddle.trainer.config_parser import logger
+from py_paddle import swig_paddle
+import util
+
+def main():
+    trainer_config = parse_config(
+        "./testTrainConfig.py", "")
+    model = swig_paddle.GradientMachine.createFromConfigProto(
+        trainer_config.model_config)
+    trainer = swig_paddle.Trainer.create(trainer_config, model)
+    trainer.startTrain()
+    for train_pass in xrange(2):
+        trainer.startTrainPass()
+        num = 0
+        cost = 0
+        while True:  # Train one batch
+            batch_size = 1000
+            data, atEnd = util.loadMNISTTrainData(batch_size)
+            if atEnd:
+                break
+            trainer.trainOneDataBatch(batch_size, data)
+            outs = trainer.getForwardOutput()
+            cost += sum(outs[0]['value'])
+            num += batch_size
+        trainer.finishTrainPass()
+        logger.info('train cost=%f' % (cost / num))
+
+        trainer.startTestPeriod()
+        num = 0
+        cost = 0
+        while True:  # Test one batch
+            batch_size = 1000
+            data, atEnd = util.loadMNISTTrainData(batch_size)
+            if atEnd:
+                break
+            trainer.testOneDataBatch(batch_size, data)
+            outs = trainer.getForwardOutput()
+            cost += sum(outs[0]['value'])
+            num += batch_size
+        trainer.finishTestPeriod()
+        logger.info('test cost=%f' % (cost / num))
+
+    trainer.finishTrain()
+ 
+
+if __name__ == '__main__':
+    swig_paddle.initPaddle("--use_gpu=0", "--trainer_count=1")
+    main()

paddle/py_paddle/dataprovider_converter.py

@@ -63,7 +63,7 @@ class SparseBinaryScanner(IScanner):
 
     def scan(self, dat):
         self.extend_cols(dat)
-        self.__rows__.append(len(dat) + self.__rows__[-1])
+        self.__rows__.append(len(self.__cols__))
         self.__height__ += 1
 
     def extend_cols(self, dat):

paddle/py_paddle/util.py

@@ -79,16 +79,7 @@ class __ParameterCallbackWrapper__(swig_paddle.UpdateCallback):
         else:
             return __ParameterCallbackWrapper__(callback).__disown__()
 
-
-def __monkeypatch_gradient_machine__():
-    """
-    Add some class methods to GradientMachine.
-    This method should be only used internally.
-    """
-    swig_paddle.GradientMachine.loadFromConfigFile = \
-        staticmethod(loadGradientMachine)
-
-    def __arguments_to_numpy__(i, arg):
+def __arguments_to_numpy__(i, arg):
     assert isinstance(arg, swig_paddle.Arguments)
     value = arg.getSlotValue(i)
     if value is not None:
@@ -103,6 +94,15 @@ def __monkeypatch_gradient_machine__():
         "id": ids
     }
 
+def __monkeypatch_gradient_machine__():
+    """
+    Add some class methods to GradientMachine.
+    This method should be only used internally.
+    """
+    swig_paddle.GradientMachine.loadFromConfigFile = \
+        staticmethod(loadGradientMachine)
+
+
     def __matrix_to_numpy__(m):
         if isinstance(m, swig_paddle.Matrix):
             return m.copyToNumpyMat()
@@ -126,7 +126,7 @@ def __monkeypatch_gradient_machine__():
         :type paramTypes: list of int
         :return: paddle.GradientMachine
         """
-        assert isinstance(protoObj, paddle.proto.ModelConfig_pb2.ModelConfig)
+        assert isinstance(protoObj, paddle.proto.ModelConfig)
         return swig_paddle.GradientMachine.createByConfigProtoStr(
             protoObj.SerializeToString(), createMode, paramTypes)
 
@@ -460,13 +460,29 @@ def __monkey_patch_protobuf_objects__():
         """
 
         assert isinstance(protoObj,
-                          paddle.proto.TrainerConfig_pb2.OptimizationConfig)
+                          paddle.proto.OptimizationConfig)
         return swig_paddle.OptimizationConfig.createFromProtoString(
             protoObj.SerializeToString())
 
     swig_paddle.OptimizationConfig.createFromProto = staticmethod(
         OptimizationConfig_createFromProto)
 
+    def TrainerConfig_createFromProto(protoObj):
+        """
+        Create a new paddle.TrainerConfig from
+        proto.OptimizationConfig
+
+        :param protoObj: proto.TrainerConfig
+        :return: paddle.TrainerConfig
+        """
+        assert isinstance(protoObj,
+                          paddle.proto.TrainerConfig)
+        return swig_paddle.TrainerConfig.createFromProtoString(
+            protoObj.SerializeToString())
+
+    swig_paddle.TrainerConfig.createFromProto = staticmethod(
+        TrainerConfig_createFromProto)
+
 
 def __monkey_patch_parameter__():
     def getBufs(self):
@@ -483,9 +499,66 @@ def __monkey_patch_parameter__():
     swig_paddle.Parameter.getBufs = getBufs
 
 
+def __monkey_patch_trainer__():
+    swig_paddle.Trainer.__create__ = staticmethod(swig_paddle.Trainer.create)
+
+    def Trainer_create(config, model=None):
+        """
+        Create a trainer for model with TrainerCOnfig trainer_config
+        trainer_config.model_config will be ignored when model is supplied.
+        Trainer.trainOneBatch() and Trainer.forwardOneBatch() can be used only
+        when trainer_config.data_config is set.
+
+        A typical usage for Trainer is:
+        .. code-block:: python
+           trainer = Trainer.create(trainer_config, model)
+           for p in xrange(num_passes)
+               while True:
+                   data = get_next_batch(batch_size)
+                   if not data:
+                       break
+                   trainer.trainOneDataBatch(batch_size, data)
+               trainer.finishTrainPass()
+           trainer.finishTrain()
+
+        The trainer will take care of logging, model saving, distributed
+        training, etc.
+
+        :param config: trainer configuration
+        :type config: paddle.proto.TrainerConfig
+        :param model: the model to be trained
+        :type model: swig_paddle.GradientMachine
+        :return: a trainer
+        :rtype swig_paddle.Trainer
+
+        """
+        assert isinstance(config, paddle.proto.TrainerConfig)
+        if model is not None:
+            assert isinstance(model, swig_paddle.GradientMachine)
+        return swig_paddle.Trainer.__create__(
+            swig_paddle.TrainerConfig.createFromProto(config), model)
+    swig_paddle.Trainer.create = staticmethod(Trainer_create)
+
+    swig_paddle.Trainer.__getForwardOutput__ = \
+        swig_paddle.Trainer.getForwardOutput
+
+    def getForwardOutput(self):
+        """
+        Get the netword outputs from the previous trainOneBatch(),
+        trainOneDataBatch(), testOneDataPatch(), or forwardOneBatch() call.
+
+        :return: list of dictionary with keys ['id', 'value'], each value is a
+                 numpy.ndarray.
+        """
+        outArgs = self.__getForwardOutput__()
+        return [__arguments_to_numpy__(i, outArgs) for i in xrange(
+            outArgs.getSlotNum())]
+
+    swig_paddle.Trainer.getForwardOutput = getForwardOutput
+
 def monkeypatches():
     patches = [__monkeypatch_init_paddle__, __monkeypatch_gradient_machine__,
                __monkey_patch_protobuf_objects__,
-               __monkey_patch_parameter__]
+               __monkey_patch_parameter__, __monkey_patch_trainer__]
     for patch in patches:
         patch()

paddle/trainer/Tester.cpp

@@ -71,24 +71,36 @@ Tester::Tester(const std::shared_ptr<TrainerConfigHelper> &config,
       parameterUpdater_));
 }
 
+void Tester::startTestPeriod() {
+  testEvaluator_->start();
+  testContext_.cost = 0;
+  testContext_.numSamples = 0;
+
+  parameterUpdater_->apply();
+  if (intconfig_->prevBatchState) {
+    gradientMachine_->getState(*intconfig_->trainState);
+    gradientMachine_->setState(*intconfig_->testState);
+  }
+}
+
+void Tester::testOneDataBatch(
+    const DataBatch& dataBatch, std::vector<Argument>* outArgs) {
+  testContext_.cost += forwardOneBatch(
+    dataBatch, testEvaluator_.get(), outArgs);
+  testContext_.numSamples += dataBatch.getSize();
+}
+
 void Tester::testOnePeriod() {
   DataBatch dataBatch;
   int64_t batchSize = config_->getOptConfig().batch_size();
-  testEvaluator_->start();
-  real cost = 0;
-  int64_t numSamples = 0;
   bool testAllData =
       intconfig_->testPeriod == 0 || intconfig_->testAllDataInOnePeriod;
-
   int batches =
       testAllData ? std::numeric_limits<int>::max() : intconfig_->testPeriod;
 
-  parameterUpdater_->apply();
-  if (intconfig_->prevBatchState) {
-    gradientMachine_->getState(*intconfig_->trainState);
-    gradientMachine_->setState(*intconfig_->testState);
-  }
+  std::vector<Argument> outArgs;
 
+  startTestPeriod();
   for (int i = 0; i < batches; ++i) {
     int num = testDataProvider_->getNextBatch(batchSize, &dataBatch);
     if (num == 0) {
@@ -102,13 +114,17 @@ void Tester::testOnePeriod() {
         num = testDataProvider_->getNextBatch(batchSize, &dataBatch);
       }
     }
-    cost += testOneBatch(dataBatch, testEvaluator_.get());
-    numSamples += num;
+    testOneDataBatch(dataBatch, &outArgs);
   }
+}
+
+void Tester::finishTestPeriod() {
   testEvaluator_->finish();
-  CHECK_GT(numSamples, 0) << "There is no samples in your test batch. Possibly "
+  CHECK_GT(testContext_.numSamples, 0)
+      << "There is no samples in your test batch. Possibly "
          "wrong implementation of DataProvidor.reset()";
-  LOG(INFO) << " Test samples=" << numSamples << " cost=" << cost / numSamples
+  LOG(INFO) << " Test samples=" << testContext_.numSamples
+            << " cost=" << testContext_.cost / testContext_.numSamples
             << " Eval: " << *testEvaluator_;
   parameterUpdater_->restore();
   if (intconfig_->prevBatchState) {
@@ -128,9 +144,11 @@ int64_t Tester::testOneBatchById(int64_t batchId) {
     return 0;
   }
 
+  std::vector<Argument> outArgs;
+
   stats_ += std::pair<int64_t, real>{
       actualBatchSize,
-      testOneBatch(dataBatch, testEvaluator_.get())};
+      forwardOneBatch(dataBatch, testEvaluator_.get(), &outArgs)};
 
   if (((batchId + 1) % intconfig_->logPeriod) == 0) {
     LOG(INFO) << " Batch=" << batchId + 1 << " " << stats_.getStats(false);
@@ -139,7 +157,10 @@ int64_t Tester::testOneBatchById(int64_t batchId) {
   return actualBatchSize;
 }
 
-real Tester::testOneBatch(const DataBatch &dataBatch, Evaluator *evaluator) {
+real Tester::forwardOneBatch(const DataBatch &dataBatch,
+                             Evaluator *evaluator,
+                             std::vector<Argument>* pOutArgs) {
+  auto& outArgs = *pOutArgs;
   const std::vector<Argument>& inArgs = dataBatch.getStreams();
   if (intconfig_->loadsaveParametersInPserver) {
     REGISTER_TIMER("prefetch");
@@ -148,12 +169,11 @@ real Tester::testOneBatch(const DataBatch &dataBatch, Evaluator *evaluator) {
                                            true /*after apply*/);
   }
 
-  std::vector<Argument> outArgs;
   gradientMachine_->forward(inArgs, &outArgs, PASS_TEST);
 
   // write features if set this flag and outArgs is not empty
   std::string featFile = intconfig_->featFile;
-  if (!featFile.empty() && !outArgs.empty()) {
+  if (!featFile.empty() && outArgs.empty()) {
     size_t numOutputs = outArgs.size();
     std::vector<MatrixPtr> featMatrices;
     featMatrices.resize(numOutputs);

paddle/trainer/Tester.h

@@ -68,6 +68,10 @@ public:
    * is training at same time.
    */
   void testOnePeriod();
+  void startTestPeriod();
+  void finishTestPeriod();
+  void testOneDataBatch(const DataBatch& dataBatch,
+                        std::vector<Argument>* outArgs);
 
   /**
    * Test for given data batch.
@@ -75,7 +79,9 @@ public:
    * @param evaluator Evaluator
    * @return cost
    */
-  real testOneBatch(const DataBatch &dataBatch, Evaluator *evaluator);
+  real forwardOneBatch(const DataBatch& dataBatch,
+                       Evaluator* evaluator,
+                       std::vector<Argument>* outArgs);
 
 
   /**
@@ -99,6 +105,10 @@ protected:
   std::ofstream os_;
   std::vector<MatrixPtr> cpuMat_;
   std::vector<IVectorPtr> cpuVec_;
+  struct {
+    int64_t numSamples;
+    real cost;
+  } testContext_;
 
 private:
   /**

paddle/trainer/Trainer.cpp

@@ -196,7 +196,8 @@ void Trainer::init(const std::shared_ptr<TrainerConfigHelper> &config,
   if (!dataProvider_ && config_->hasDataConfig()) {
     dataProvider_.reset(DataProvider::create(*config_, *config_, gpuData));
   }
-  if (dataProvider_) {
+  if (!testDataProvider_) {
+    // No evaluator_ if there is testDataProvider but no dataProvider.
     evaluator_.reset(trainerInternal_.getGradientMachine()->makeEvaluator());
     currentEvaluator_.reset(
         trainerInternal_.getGradientMachine()->makeEvaluator());
@@ -215,10 +216,7 @@ void Trainer::init(const std::shared_ptr<TrainerConfigHelper> &config,
         DataProvider::create(config_->getTestDataConfig(), *config_, gpuData));
   }
   if (testDataProvider_) {
-    tester_.reset(new Tester(config_, createTesterConfig(),
-                 trainerInternal_.getGradientMachine(),
-                 trainerInternal_.getParameterUpdater(),
-                 testDataProvider_));
+    createTester();
   }
 
   if (!testing &&
@@ -258,34 +256,25 @@ void Trainer::init(const std::shared_ptr<TrainerConfigHelper> &config,
     }
   }
 
-
   // set current evaluator and evalutor
   trainerInternal_.setCurrentEvaluator(currentEvaluator_.get());
   trainerInternal_.setEvaluator(evaluator_.get());
 }
 
 void Trainer::train(size_t numPasses) {
-  srand(config_->getConfig().start_pass() + 1);
-  dataProvider_->reset();
-
-  if (this->testDataProvider_) {
-    this->testDataProvider_->reset();
-  }
-
-  trainerInternal_.getGradientMachine()->start(*config_, dataProvider_);
-
+  startTrain();
   for (size_t i = 0; i < numPasses; ++i) {
     if (IGradientMachineMode::trainWholeDataInOneBatch(mode_)) {
       trainOnePassBatch(config_->getConfig().start_pass() + i);
     } else {
-      trainOnePass(config_->getConfig().start_pass() + i);
+      trainOnePass();
     }
     if (i < numPasses - 1) {
       dataProvider_->reset();
     }
   }
 
-  trainerInternal_.getGradientMachine()->finish();
+  finishTrain();
 }
 
 
@@ -387,13 +376,30 @@ real Trainer::checkGradient() {
   return maxDiff;
 }
 
-void Trainer::trainOnePass(int passId) {
-  this->stats_->reset();
-  int64_t batchId = 0;
-  int32_t batchSize = config_->getOptConfig().batch_size();
-  real avgTestCost = 0;
-  int64_t numAvgTests = 0;
-  int passInnerId = 1;
+void Trainer::startTrain() {
+  trainPassContext_.passId = config_->getConfig().start_pass();
+  srand(config_->getConfig().start_pass() + 1);
+  if (dataProvider_) {
+    dataProvider_->reset();
+  }
+
+  if (this->testDataProvider_) {
+    this->testDataProvider_->reset();
+  }
+
+  trainerInternal_.getGradientMachine()->start(*config_, dataProvider_);
+}
+
+void Trainer::finishTrain() {
+  trainerInternal_.getGradientMachine()->finish();
+}
+
+void Trainer::startTrainPass() {
+  stats_->reset();
+  trainPassContext_.batchId = 0;
+  trainPassContext_.avgTestCost = 0;
+  trainPassContext_.numAvgTests = 0;
+  trainPassContext_.passInnerId = 1;
 
   trainerInternal_.getParameterUpdater()->startPass();
   evaluator_->start();
@@ -401,18 +407,12 @@ void Trainer::trainOnePass(int passId) {
     trainerInternal_.getGradientMachine()->resetState();
     trainerInternal_.getGradientMachine()->getState(testState_);
   }
-  while (true) {
-    DataBatch dataBatch;
-
-    int num = 0;
-    {
-      REGISTER_TIMER("getTrainBatch");
-      num = dataProvider_->getNextBatch(batchSize, &dataBatch);
-    }
-    if (num == 0) break;
+}
 
+void Trainer::trainOneDataBatch(DataBatch& dataBatch) {
+  int num = dataBatch.getSize();
   if (averageEvaluator_) {
-      int64_t mod = batchId % FLAGS_average_test_period;
+    int64_t mod = trainPassContext_.batchId % FLAGS_average_test_period;
     if (mod >= FLAGS_average_test_period - FLAGS_log_period) {
       if (mod == FLAGS_average_test_period - FLAGS_log_period) {
         averageEvaluator_->start();
@@ -421,61 +421,69 @@ void Trainer::trainOnePass(int passId) {
       if (FLAGS_prev_batch_state) {
         trainerInternal_.getGradientMachine()->getState(trainState_);
       }
-        avgTestCost +=
-            tester_->testOneBatch(dataBatch, averageEvaluator_.get());
+      trainPassContext_.avgTestCost +=
+          tester_->forwardOneBatch(
+            dataBatch, averageEvaluator_.get(), &forwardOutput_);
       if (FLAGS_prev_batch_state) {
         trainerInternal_.getGradientMachine()->setState(trainState_);
       }
-        numAvgTests += num;
+      trainPassContext_.numAvgTests += num;
       trainerInternal_.getParameterUpdater()->restore();
     }
   }
   {
     REGISTER_TIMER("TrainBatch");
-      trainerInternal_.trainOneBatch(batchId, dataBatch);
+    trainerInternal_.trainOneBatch(
+      trainPassContext_.batchId, dataBatch, &forwardOutput_);
   }
 
   if (averageEvaluator_ &&
-        batchId % FLAGS_average_test_period == FLAGS_average_test_period - 1) {
+      trainPassContext_.batchId % FLAGS_average_test_period
+        == FLAGS_average_test_period - 1) {
     averageEvaluator_->finish();
     LOG(INFO) << " Averaged parameter:"
-                << " cost=" << avgTestCost / numAvgTests
+              << " cost=" << trainPassContext_.avgTestCost
+                             / trainPassContext_.numAvgTests
               << " Eval: " << *averageEvaluator_;
-      numAvgTests = 0;
-      avgTestCost = 0;
+    trainPassContext_.numAvgTests = 0;
+    trainPassContext_.avgTestCost = 0;
   }
 
-    ++batchId;
+  ++trainPassContext_.batchId;
 
-    if (batchId % FLAGS_log_period == 0) {
+  if (trainPassContext_.batchId % FLAGS_log_period == 0) {
     FOR_TIMING(globalStat.setThreadInfo(true));
     FOR_TIMING(globalStat.printAllStatus());
     FOR_TIMING(globalStat.reset());
   }
 
   if (testDataProvider_ && FLAGS_test_period > 0 &&
-        batchId % FLAGS_test_period == 0) {
+      trainPassContext_.batchId % FLAGS_test_period == 0) {
     tester_->testOnePeriod();
   }
 
   if (FLAGS_saving_period_by_batches > 0 &&
-        batchId > FLAGS_saving_period_by_batches * passInnerId &&
+      trainPassContext_.batchId
+          > FLAGS_saving_period_by_batches * trainPassContext_.passInnerId &&
       0 == FLAGS_trainer_id) {
     trainerInternal_.getParameterUpdater()->catchUpWith();
     if (testDataProvider_) {
       tester_->testOnePeriod();
     }
-      paramUtil_->saveParametersOnePass(passId, passInnerId);
-      ++passInnerId;
-    }
+    paramUtil_->saveParametersOnePass(
+      trainPassContext_.passId, trainPassContext_.passInnerId);
+    ++trainPassContext_.passInnerId;
   }
+}
 
-  if (batchId == 0) {
+void Trainer::finishTrainPass() {
+  if (trainPassContext_.batchId == 0) {
     // This means no more data from DataProvider
     return;
   }
 
-  trainerInternal_.finishTrainPass(passId, batchId);
+  trainerInternal_.finishTrainPass(
+    trainPassContext_.passId, trainPassContext_.batchId);
 
   FOR_TIMING(globalStat.setThreadInfo(true));
   FOR_TIMING(globalStat.printAllStatus());
@@ -485,9 +493,30 @@ void Trainer::trainOnePass(int passId) {
     tester_->testOnePeriod();
   }
 
-  if (passId % FLAGS_saving_period == 0 && FLAGS_trainer_id == 0) {
-    paramUtil_->saveParametersOnePass(passId);
+  if (trainPassContext_.passId % FLAGS_saving_period == 0
+      && FLAGS_trainer_id == 0) {
+    paramUtil_->saveParametersOnePass(trainPassContext_.passId);
   }
+  ++trainPassContext_.passId;
+}
+
+void Trainer::trainOnePass() {
+  startTrainPass();
+  size_t batchSize = config_->getOptConfig().batch_size();
+  while (true) {
+    DataBatch dataBatch;
+
+    int num = 0;
+    {
+      REGISTER_TIMER("getTrainBatch");
+      num = dataProvider_->getNextBatch(batchSize, &dataBatch);
+    }
+    if (num == 0) break;
+    CHECK_EQ(num, dataBatch.getSize());
+    trainOneDataBatch(dataBatch);
+  }
+
+  finishTrainPass();
 }
 
 void Trainer::trainOnePassBatch(int passId) {
@@ -582,6 +611,13 @@ void Trainer::clearGradient() {
 
 int Trainer::getBatchSize() { return config_->getOptConfig().batch_size(); }
 
+void Trainer::createTester() {
+  tester_.reset(new paddle::Tester(config_, createTesterConfig(),
+                                   trainerInternal_.getGradientMachine(),
+                                   trainerInternal_.getParameterUpdater(),
+                                   testDataProvider_));
+}
+
 void Trainer::test() {
   tester_->test();
 }

paddle/trainer/Trainer.h

@@ -94,6 +94,11 @@ public:
    */
   real checkGradient();
 
+  void startTrain();
+  void finishTrain();
+  void startTrainPass();
+  void finishTrainPass();
+  void trainOneDataBatch(DataBatch& dataBatch);
 
   /**
    * given a dataBatch and the current parameter value
@@ -144,11 +149,11 @@ public:
 
 protected:
   /**
-   * Train one pass of data. passId starts from 0
+   * Train one pass of data.
    *
    * SGD Method.
    */
-  void trainOnePass(int passId);
+  void trainOnePass();
 
   /**
    * Train one pass in one batch.
@@ -161,6 +166,8 @@ protected:
    */
   void clearGradient();
 
+  void createTester();
+
 private:
   std::unique_ptr<TesterConfig> createTesterConfig();
 
@@ -173,6 +180,17 @@ protected:
   MachineState trainState_;
   MachineState testState_;
 
+  struct TrainPassContext {
+    int64_t batchId;
+    real avgTestCost;
+    int64_t numAvgTests;
+    int passId;
+    int passInnerId;
+  };
+  std::vector<paddle::Argument> forwardOutput_;
+
+  TrainPassContext trainPassContext_;
+
   std::unique_ptr<Evaluator> evaluator_;
   std::unique_ptr<Evaluator> currentEvaluator_;
   std::unique_ptr<Evaluator> averageEvaluator_;

paddle/trainer/TrainerInternal.cpp

@@ -55,6 +55,8 @@ void TrainerInternal::init(const std::shared_ptr<TrainerConfigHelper> &config,
 
     gradientMachine_ = gradientMachine;
     if (!gradientMachine) {
+      CHECK(config_->getConfig().has_model_config())
+          << "Missing model_config in trainer_config";
       gradientMachine_.reset(GradientMachine::create(
         config_->getConfig().model_config(), intconfig_->mode,
         parameterUpdater_->getParameterTypes()));
@@ -62,7 +64,8 @@ void TrainerInternal::init(const std::shared_ptr<TrainerConfigHelper> &config,
 }
 
 void TrainerInternal::trainOneBatch(int64_t batchId,
-                                    const DataBatch& dataBatch) {
+                                    const DataBatch& dataBatch,
+                                    std::vector<Argument>* outArgs) {
   // true means updating parameter whenever gradient is ready during backward()
   bool doPipelineUpdate =
       (intconfig_->mode != GradientMachine::kSgdSparseCpuTraining) &&
@@ -84,7 +87,6 @@ void TrainerInternal::trainOneBatch(int64_t batchId,
   }
 
   const std::vector<Argument>& inArgs = dataBatch.getStreams();
-  std::vector<Argument> outArgs;
 
   PassType passType = parameterUpdater_->startBatch(actualBatchSize);
 
@@ -114,7 +116,7 @@ void TrainerInternal::trainOneBatch(int64_t batchId,
     timer.start();
 #endif
     REGISTER_TIMER("forwardBackward");
-    forwardBackwardBatch(inArgs, outArgs, passType, updateCallback,
+    forwardBackwardBatch(inArgs, *outArgs, passType, updateCallback,
                          doPipelineUpdate);
 #ifndef PADDLE_DISABLE_TIMER
     timer.stop();
@@ -132,7 +134,7 @@ void TrainerInternal::trainOneBatch(int64_t batchId,
   real cost = 0;
   {
     REGISTER_TIMER("sumCost");
-    cost = Argument::sumCosts(outArgs);
+    cost = Argument::sumCosts(*outArgs);
   }
 
   if (batchId % intconfig_->log_period == 0) {

paddle/trainer/TrainerInternal.h

@@ -81,7 +81,9 @@ public:
    * @param batchId current batch id
    * @param dataBatch data for the batch
    */
-  void trainOneBatch(int64_t batchId, const DataBatch& dataBatch);
+  void trainOneBatch(int64_t batchId,
+                     const DataBatch& dataBatch,
+                     std::vector<Argument>* outArgs);
 
   /**
    * showParameterStats

proto/TrainerConfig.proto.m4

@@ -130,7 +130,7 @@ message OptimizationConfig {
 };
 
 message TrainerConfig {
-  required ModelConfig model_config = 1;
+  optional ModelConfig model_config = 1;
   optional DataConfig data_config = 2;
   required OptimizationConfig opt_config = 3;
   optional DataConfig test_data_config = 4;

python/paddle/proto/__init__.py

@@ -12,3 +12,5 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
+from paddle.proto.TrainerConfig_pb2 import OptimizationConfig, TrainerConfig
+from paddle.proto.ModelConfig_pb2 import ModelConfig