/* Copyright (c) 2017 PaddlePaddle Authors. 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 "MKLDNNTester.h"
#include "paddle/gserver/layers/MKLDNNBase.h"
#include "paddle/gserver/layers/MKLDNNLayer.h"
#include "paddle/trainer/Trainer.h"

namespace paddle {

// init data layer and test layer of both dnn and reference
void MKLDNNTester::reset(const TestConfig& dnn,
                         const TestConfig& ref,
                         size_t batchSize) {
  const bool trans = false;
  const bool useGpu = false;

  // clear
  configs_.clear();
  layerNames_.clear();
  dataLayers_.clear();
  datas_.clear();
  layerMaps_.clear();
  parameters_.clear();
  testLayers_.clear();

  // resize
  configs_.resize(NUM);
  layerNames_.resize(NUM);
  dataLayers_.resize(NUM);
  datas_.resize(NUM);
  layerMaps_.resize(NUM);
  parameters_.resize(NUM);
  testLayers_.resize(NUM);

  // reset configs and layer names
  configs_[DNN] = dnn;
  configs_[REF] = ref;
  layerNames_[DNN] = "mkldnn";     // the first is mkldnn layer
  layerNames_[REF] = "reference";  // second is reference layer

  // reset others
  for (size_t i = 0; i < NUM; ++i) {
    configs_[i].layerConfig.set_name(layerNames_[i]);
    initDataLayer(configs_[i],
                  &(dataLayers_[i]),
                  &(datas_[i]),
                  &(layerMaps_[i]),
                  layerNames_[i],
                  batchSize,
                  trans,
                  useGpu);
    initTestLayer(
        configs_[i], &(layerMaps_[i]), &(parameters_[i]), &(testLayers_[i]));
  }
  refLayer_ = testLayers_[REF];
  dnnLayer_ = testLayers_[DNN];
  EXPECT_EQ(dataLayers_[DNN].size(), dataLayers_[REF].size());
  EXPECT_EQ(parameters_[DNN].size(), parameters_[REF].size());
  setInputImgSize();

  // for comparison with Paddle reference results,
  // need manually add cpu device output for test
  MKLDNNLayerPtr dnnLayer = std::dynamic_pointer_cast<MKLDNNLayer>(dnnLayer_);
  if (dnnLayer) {
    dnnLayer->addOutputArgument(CPU_DEVICE);
  }
}

void MKLDNNTester::setInputImgSize() {
  for (size_t n = 0; n < dataLayers_.size(); ++n) {
    for (size_t i = 0; i < dataLayers_[n].size(); ++i) {
      // TODO(TJ): fix me when concat and elewise ready
      dataLayers_[n][i]->getOutput().setFrameHeight(ih_);
      dataLayers_[n][i]->getOutput().setFrameWidth(iw_);
    }
  }
}

// init randome parameters of ref, and copy to mkldnn
void MKLDNNTester::randomWgtDatas() {
  EXPECT_EQ(parameters_[DNN].size(), parameters_[REF].size());
  const bool isBN = refLayer_->getType() == "batch_norm";
  for (size_t i = 0; i < parameters_[REF].size(); ++i) {
    const VectorPtr& dnnValue = parameters_[DNN][i]->getBuf(PARAMETER_VALUE);
    const VectorPtr& refValue = parameters_[REF][i]->getBuf(PARAMETER_VALUE);
    parameters_[REF][i]->randomize();
    if (isBN && i == 2) {
      // this param is moving average in batch norm, which must larger than 0
      real offset = fabs(refValue->getMin()) + 1.0;
      refValue->add(offset);
    }
    dnnValue->copyFrom(*refValue);

    VLOG(MKLDNN_TESTS) << "Random weight " << parameters_[DNN][i]->getName();
    printVector(dnnValue);
  }
}

// random botdata of ref layer and copy same to mkldnn
void MKLDNNTester::randomBotDatas() {
  CHECK_EQ(dataLayers_.size(), NUM);
  for (size_t i = 0; i < dataLayers_[DNN].size(); ++i) {
    dataLayers_[REF][i]->getOutputValue()->randomizeUniform();
    dataLayers_[DNN][i]->getOutputValue()->copyFrom(
        *(dataLayers_[REF][i]->getOutputValue()));
    VLOG(MKLDNN_TESTS) << "Random Foward, InputValue " << i;
    printMatrix(dataLayers_[REF][i]->getOutputValue());
  }
}

void MKLDNNTester::randomTopDiffs() {
  refLayer_->getOutputGrad()->randomizeUniform();
  dnnLayer_->getOutput(CPU_DEVICE)
      .grad->copyFrom(*(refLayer_->getOutputGrad()));
  VLOG(MKLDNN_TESTS) << "Random Backward, OutputGrad";
  printMatrix(refLayer_->getOutputGrad());
}

void MKLDNNTester::checkForward() {
  VLOG(MKLDNN_TESTS) << "Check Forward";
  printTopDatas();
  double delta =
      compareMatrix(refLayer_->getOutputValue(), dnnLayer_->getOutputValue());
  EXPECT_LE(fabs(delta), eps_);
}

void MKLDNNTester::checkBackwardData() {
  VLOG(MKLDNN_TESTS) << "Check Backward Data";
  const bool isBN = refLayer_->getType() == "batch_norm";
  for (size_t i = 0; i < dataLayers_[DNN].size(); ++i) {
    const MatrixPtr& dnnDiff = dataLayers_[DNN][i]->getOutputGrad();
    const MatrixPtr& refDiff = dataLayers_[REF][i]->getOutputGrad();
    VLOG(MKLDNN_ALL) << "MKLDNN Backward Result: InputGrad " << i;
    printMatrix(dnnDiff);
    VLOG(MKLDNN_ALL) << "Reference Backward Result: InputGrad " << i;
    printMatrix(refDiff);

    double delta = compareMatrix(refDiff, dnnDiff);
    EXPECT_LE(fabs(delta), eps_);
    if (isBN) {
      // the other two inputs in batch norm are for moving mean and var
      // do not have grad to compare
      break;
    }
  }
}

void MKLDNNTester::checkBackwardWgts() {
  VLOG(MKLDNN_TESTS) << "Check Backward Weight";
  CHECK_EQ(parameters_[DNN].size(), parameters_[REF].size());
  vector<VectorPtr> dnnWgts;  // used to temply save mkldnn weights
  saveWgt(parameters_[DNN], dnnWgts);

  MKLDNNLayerPtr dnnLayer = std::dynamic_pointer_cast<MKLDNNLayer>(dnnLayer_);
  if (dnnLayer) {
    dnnLayer->convertWeightsToPaddle();
  }
  for (size_t i = 0; i < parameters_[DNN].size(); ++i) {
    const VectorPtr& dnn = parameters_[DNN][i]->getBuf(PARAMETER_VALUE);
    const VectorPtr& ref = parameters_[REF][i]->getBuf(PARAMETER_VALUE);
    VLOG(MKLDNN_ALL) << "MKLDNN Result: weight value"
                     << parameters_[DNN][i]->getName();
    printVector(dnn);
    VLOG(MKLDNN_ALL) << "Reference Result: weight value "
                     << parameters_[REF][i]->getName();
    printVector(ref);

    double delta = compareVector(ref, dnn);
    EXPECT_LE(fabs(delta), eps_);
  }

  VLOG(MKLDNN_ALL) << "Restore dnn weights before comapre";
  restoreWgt(dnnWgts, parameters_[DNN]);
}

void MKLDNNTester::saveWgt(const vector<ParameterPtr>& from,
                           vector<VectorPtr>& to) {
  const bool useGpu = false;
  to.resize(from.size());
  for (size_t i = 0; i < to.size(); ++i) {
    const VectorPtr& wgt = from[i]->getBuf(PARAMETER_VALUE);
    to[i] = Vector::create(wgt->getSize(), useGpu);
    to[i]->copyFrom(*wgt);
  }
}

void MKLDNNTester::restoreWgt(const vector<VectorPtr>& from,
                              vector<ParameterPtr>& to) {
  CHECK_EQ(from.size(), to.size());
  for (size_t i = 0; i < from.size(); ++i) {
    const VectorPtr& wgt = to[i]->getBuf(PARAMETER_VALUE);
    wgt->copyFrom(*from[i]);
  }
}

// clear parameters grad
void MKLDNNTester::clearWgtDiffs(size_t id) {
  CHECK_LE(id, parameters_.size());
  for (size_t n = 0; n < parameters_.size(); ++n) {
    if (id == n || id == parameters_.size()) {
      for (size_t i = 0; i < parameters_[n].size(); ++i) {
        const VectorPtr& grad = parameters_[n][i]->getBuf(PARAMETER_GRADIENT);
        if (grad) {
          grad->zeroMem();
        }
      }
    }
  }
}

void MKLDNNTester::clearBotDiffs(size_t id) {
  CHECK_LE(id, dataLayers_.size());
  for (size_t n = 0; n < dataLayers_.size(); ++n) {
    if (id == n || id == dataLayers_.size()) {
      // clear inputs layers of this specific layer
      for (size_t i = 0; i < dataLayers_[n].size(); ++i) {
        dataLayers_[n][i]->getOutputGrad()->zeroMem();
      }
    }
  }
}

void MKLDNNTester::clearTopDatas(size_t id) {
  CHECK_LE(id, testLayers_.size());
  for (size_t i = 0; i < testLayers_.size(); ++i) {
    if (id == i || id == testLayers_.size()) {
      testLayers_[i]->getOutputValue()->zeroMem();
    }
  }
}

void MKLDNNTester::printTopDatas() {
  if (!log_) {
    return;
  }

  for (int n = 0; n < NUM; ++n) {
    VLOG(MKLDNN_ALL) << testLayers_[n]->getType()
                     << " Forward Result: OutputValue";
    printMatrix(testLayers_[n]->getOutputValue());
  }
}

void MKLDNNTester::printMatrix(const MatrixPtr& m) {
  if (!log_) {
    return;
  }

  std::ostringstream ostr;
  m->print(ostr);
  VLOG(MKLDNN_ALL) << std::endl << ostr.str();
}

void MKLDNNTester::printVector(const VectorPtr& v) {
  if (!log_) {
    return;
  }

  std::ostringstream ostr;
  v->print(ostr, v->getSize());
  VLOG(MKLDNN_ALL) << std::endl << ostr.str();
}

double MKLDNNTester::getDelta(const real* refer,
                              const real* value,
                              size_t len,
                              const float failRate,
                              const float thres) {
  double delta = 0, sum = 0;
  int failCnt = 0;
  const double eps = 1e-5;
  double maxRatio = 0;
  for (size_t i = 0; i < len; ++i) {
    double ref = fabs(refer[i]);
    double val = fabs(value[i]);
    double diff = fabs(refer[i] - value[i]);
    delta += diff;
    sum += ref;
    if (ref < eps && val < eps) {  // both values are very small
      continue;
    }
    double ratio = diff / ref;
    if (ratio > thres) {
      maxRatio = std::max(maxRatio, ratio);
      failCnt++;
    }
  }
  EXPECT_FALSE(std::isinf(sum));
  EXPECT_FALSE(std::isnan(sum));
  EXPECT_FALSE(std::isnan(delta));
  VLOG(MKLDNN_ALL) << "reference avg data: " << sum / len
                   << ", delta: " << delta / sum << ", failCnt:" << failCnt;
  double res = sum > eps ? delta / sum : eps;
  return (failCnt / (float)len) > failRate ? maxRatio : res;
}

double MKLDNNTester::compareMatrix(const MatrixPtr& m1, const MatrixPtr& m2) {
  CHECK_EQ(m1->getElementCnt(), m2->getElementCnt());
  return getDelta(m1->getData(), m2->getData(), m1->getElementCnt());
}

double MKLDNNTester::compareVector(const VectorPtr& v1, const VectorPtr& v2) {
  CHECK_EQ(v1->getSize(), v2->getSize());
  return getDelta(v1->getData(), v2->getData(), v1->getSize());
}

void MKLDNNTester::runOnce() {
  // test forward
  randomBotDatas();
  dnnLayer_->forward(passType_);
  refLayer_->forward(passType_);
  checkForward();

  if (passType_ == PASS_TEST) {
    return;
  }

  // test backward
  // simple updater
  UpdateCallback updateCallback = [](Parameter* para) {
    auto& grad = para->getBuf(PARAMETER_GRADIENT);
    auto& value = para->getBuf(PARAMETER_VALUE);
    real lr = 1e-2;
    value->add(*grad, lr);
    grad->zeroMem();
  };
  randomTopDiffs();
  dnnLayer_->backward(updateCallback);
  refLayer_->backward(updateCallback);
  checkBackwardData();
  checkBackwardWgts();

  // clear buffers
  // ref code will addto the diff, dnn code will writeto it
  // and clearTopDatas(REF) should be coverd by ref layers
  clearBotDiffs(REF);
  clearWgtDiffs(REF);
  // it is necessary to clear bottom diffs when only activation is dnn type
  if (configs_[DNN].layerConfig.active_type().compare(0, 7, "mkldnn_") == 0) {
    clearBotDiffs(DNN);
  }
}

void MKLDNNTester::run(const TestConfig& dnn,
                       const TestConfig& ref,
                       size_t batchSize,
                       size_t inputImgH,
                       size_t inputImgW,
                       PassType passType,
                       bool printDetails,
                       size_t iter,
                       float epsilon) {
  CHECK(dnn.layerConfig.type().compare(0, 7, "mkldnn_") == 0 ||
        dnn.layerConfig.active_type().compare(0, 7, "mkldnn_") == 0)
      << "should be MKLDNN layer or MKLDNN activation";
  if (dnn.layerConfig.type() == ref.layerConfig.type()) {
    VLOG(MKLDNN_TESTS) << "Test MKLDNN functionality: "
                       << dnn.layerConfig.active_type() << " vs "
                       << ref.layerConfig.active_type();
  } else {
    VLOG(MKLDNN_TESTS) << "Test MKLDNN functionality: "
                       << dnn.layerConfig.type() << " vs "
                       << ref.layerConfig.type();
  }

  ih_ = inputImgH;
  iw_ = inputImgW;
  passType_ = passType;
  log_ = printDetails;
  iter_ = iter;
  eps_ = epsilon;

  // Firstly test mkldnn init from PARAM_FORMAT_ORIGINAL weight
  reset(dnn, ref, batchSize);
  randomWgtDatas();
  clearWgtDiffs();
  clearBotDiffs();
  for (size_t i = 0; i < iter_; ++i) {
    VLOG(MKLDNN_TESTS) << "Check Iteration " << i;
    runOnce();
  }

  if (parameters_[DNN].empty()) {
    // has no paramters
    return;
  }

  // After run some iterations, the mkldnn weight has been stored in dnnLayer
  // and we can also get the mkldnn weight parameter header format.
  // Weight parameter should always be index 0 (and bias index 1).
  // TODO(TJ): should also consider mean and var format when batchnorm ready
  int dnnWgtFmt = parameters_[DNN][0]->getHeaderFormat();
  int refWgtFmt = parameters_[REF][0]->getHeaderFormat();
  if (dnnWgtFmt == refWgtFmt) {
    // weight format are equal, so no need check more
    return;
  }

  // then save the weights and restart again
  vector<VectorPtr> dnnWgts, refWgts;
  CHECK_EQ(parameters_[DNN].size(), parameters_[REF].size());
  saveWgt(parameters_[DNN], dnnWgts);
  saveWgt(parameters_[REF], refWgts);

  // restart again with dnn weight format
  reset(dnn, ref, batchSize);
  // TODO(TJ): should also considerate mean and var format when batchnorm ready
  parameters_[DNN][0]->setHeaderFormat(dnnWgtFmt);

  // restore wgt
  restoreWgt(dnnWgts, parameters_[DNN]);
  restoreWgt(refWgts, parameters_[REF]);
  clearWgtDiffs();
  clearBotDiffs();

  for (size_t i = 0; i < iter_; ++i) {
    VLOG(MKLDNN_TESTS) << "Check Iteration " << i;
    runOnce();
  }
}

void MKLDNNTester::initArgument(DataIn& data,
                                const std::string& configPath,
                                const size_t iter) {
  TrainerConfigHelper config(configPath);
  size_t batchSize = config.getOptConfig().batch_size();
  data.inArgs.resize(iter);
  data.outGrads.resize(iter);
  data.paraValues.clear();
  for (const auto& layer_name : config.getModelConfig().input_layer_names()) {
    auto layer_config = std::find_if(config.getModelConfig().layers().begin(),
                                     config.getModelConfig().layers().end(),
                                     [=](const LayerConfig& layer_config) {
                                       return layer_config.name() == layer_name;
                                     });
    CHECK(layer_config != config.getModelConfig().layers().end());

    size_t layerSize = layer_config->size();
    for (size_t i = 0; i < iter; ++i) {
      Argument arg;
      arg.value = Matrix::create(batchSize, layerSize, false, false);
      arg.grad = Matrix::create(batchSize, layerSize, false, false);
      arg.value->randomizeUniform();
      arg.value->add(-0.5);
      arg.value->sigmoid(*arg.value);
      arg.grad->zeroMem();
      arg.ids = VectorT<int>::create(batchSize, false);
      arg.ids->rand(layerSize);
      generateSequenceStartPositions(batchSize, arg.sequenceStartPositions);
      data.inArgs[i].push_back(arg);
    }
  }

  for (const auto& layer_name : config.getModelConfig().output_layer_names()) {
    auto layer_config = std::find_if(config.getModelConfig().layers().begin(),
                                     config.getModelConfig().layers().end(),
                                     [=](const LayerConfig& layer_config) {
                                       return layer_config.name() == layer_name;
                                     });
    CHECK(layer_config != config.getModelConfig().layers().end());

    size_t layerSize = layer_config->size();
    for (size_t i = 0; i < iter; ++i) {
      MatrixPtr grad = Matrix::create(batchSize, layerSize, false, false);
      grad->randomizeUniform();
      data.outGrads[i].push_back(grad);
    }
  }

  for (const auto& para_config : config.getModelConfig().parameters()) {
    VectorPtr value = Vector::create(para_config.size(), false);
    value->randnorm(0, 2);
    data.paraValues.push_back(value);
  }
}

void MKLDNNTester::getOutResult(const std::string& configPath,
                                DataIn& in,
                                DataOut& out,
                                bool use_mkldnn,
                                size_t iter) {
  FLAGS_use_gpu = false;
  FLAGS_use_mkldnn = use_mkldnn;
  *ThreadLocalRand::getSeed() = 1;
  srand(1);

  Trainer trainer;
  auto config = std::make_shared<TrainerConfigHelper>(configPath);
  trainer.init(config, false);
  auto gradientMachine = trainer.getGradientMachine();
  std::vector<ParameterPtr> parameters = gradientMachine->getParameters();
  for (size_t i = 0; i < in.paraValues.size(); i++) {
    parameters[i]->getBuf(PARAMETER_VALUE)->copyFrom(*in.paraValues[i]);
  }
  UpdateCallback simpleUpdate = [](Parameter* para) {
    auto& grad = para->getBuf(PARAMETER_GRADIENT);
    auto& value = para->getBuf(PARAMETER_VALUE);
    real lr = 1e-2;
    value->add(*grad, lr);
    grad->zeroMem();
  };

  vector<Argument> outArgs;
  gradientMachine->start();
  out.outValues.clear();
  out.paraValues.clear();
  for (size_t i = 0; i < iter; ++i) {
    VLOG(MKLDNN_TESTS) << "runing iteration " << i;
    gradientMachine->forward(in.inArgs[i], &outArgs, PASS_TRAIN);
    // save forward result
    for (size_t k = 0; k < outArgs.size(); k++) {
      const MatrixPtr& src = outArgs[k].value;
      MatrixPtr dst =
          Matrix::create(src->getHeight(), src->getWidth(), false, false);
      if (typeid(*src) == typeid(MKLDNNMatrix)) {
        MKLDNNMatrixPtr dnnSrc = std::dynamic_pointer_cast<MKLDNNMatrix>(src);
        dnnSrc->copyTo(*dst);
      } else {
        dst->copyFrom(*src);
      }
      out.outValues.push_back(dst);
    }

    // random backward input
    for (size_t k = 0; k < outArgs.size(); k++) {
      outArgs[k].grad->copyFrom(*in.outGrads[i][k]);
    }
    gradientMachine->backward(simpleUpdate);
  }
  gradientMachine->finish();

  // save param value
  for (size_t i = 0; i < in.paraValues.size(); i++) {
    VectorPtr val = Vector::create(
        parameters[i]->getBuf(PARAMETER_VALUE)->getSize(), false);
    val->copyFrom(*parameters[i]->getBuf(PARAMETER_VALUE));
    out.paraValues.push_back(val);
  }
}

void MKLDNNTester::compareResult(DataOut& ref, DataOut& dnn, float eps) {
  CHECK_EQ(ref.outValues.size(), dnn.outValues.size());
  CHECK_EQ(ref.paraValues.size(), dnn.paraValues.size());
  for (size_t i = 0; i < ref.outValues.size(); i++) {
    VLOG(MKLDNN_TESTS) << "compare value index: " << i;
    EXPECT_LE(fabs(compareMatrix(ref.outValues[i], dnn.outValues[i])), eps);
  }
  for (size_t i = 0; i < ref.paraValues.size(); i++) {
    VLOG(MKLDNN_TESTS) << "compare param index: " << i;
    EXPECT_LE(fabs(compareVector(ref.paraValues[i], dnn.paraValues[i])), eps);
  }
}

void MKLDNNTester::runNetTest(const std::string& configPath,
                              size_t iter,
                              float eps) {
  DataIn in;
  initArgument(in, configPath, iter);
  DataOut outCpu, outDnn;
  VLOG(MKLDNN_TESTS) << "runing cpu network";
  getOutResult(configPath, in, outCpu, false, iter);
  VLOG(MKLDNN_TESTS) << "runing mkldnn network";
  getOutResult(configPath, in, outDnn, true, iter);

  compareResult(outCpu, outDnn, eps);
}

}  //  namespace paddle
