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c_api.cpp
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c_api.cpp
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#include <LightGBM/c_api.h>
#include <LightGBM/utils/openmp_wrapper.h>
#include <LightGBM/utils/common.h>
#include <LightGBM/utils/random.h>
#include <LightGBM/utils/threading.h>
#include <LightGBM/utils/log.h>
#include <LightGBM/dataset_loader.h>
#include <LightGBM/dataset.h>
#include <LightGBM/boosting.h>
#include <LightGBM/objective_function.h>
#include <LightGBM/metric.h>
#include <LightGBM/config.h>
#include <LightGBM/prediction_early_stop.h>
#include <LightGBM/network.h>
#include <cstdio>
#include <vector>
#include <string>
#include <cstring>
#include <memory>
#include <stdexcept>
#include <mutex>
#include <functional>
#include "./application/predictor.hpp"
namespace LightGBM {
inline int LGBM_APIHandleException(const std::exception& ex) {
LGBM_SetLastError(ex.what());
return -1;
}
inline int LGBM_APIHandleException(const std::string& ex) {
LGBM_SetLastError(ex.c_str());
return -1;
}
#define API_BEGIN() try {
#define API_END() } \
catch(std::exception& ex) { return LGBM_APIHandleException(ex); } \
catch(std::string& ex) { return LGBM_APIHandleException(ex); } \
catch(...) { return LGBM_APIHandleException("unknown exception"); } \
return 0;
class Booster {
public:
explicit Booster(const char* filename) {
boosting_.reset(Boosting::CreateBoosting("gbdt", filename));
}
Booster(const Dataset* train_data,
const char* parameters) {
auto param = Config::Str2Map(parameters);
config_.Set(param);
if (config_.num_threads > 0) {
omp_set_num_threads(config_.num_threads);
}
// create boosting
if (config_.input_model.size() > 0) {
Log::Warning("Continued train from model is not supported for c_api,\n"
"please use continued train with input score");
}
boosting_.reset(Boosting::CreateBoosting(config_.boosting, nullptr));
train_data_ = train_data;
CreateObjectiveAndMetrics();
// initialize the boosting
if (config_.tree_learner == std::string("feature")) {
Log::Fatal("Do not support feature parallel in c api");
}
if (Network::num_machines() == 1 && config_.tree_learner != std::string("serial")) {
Log::Warning("Only find one worker, will switch to serial tree learner");
config_.tree_learner = "serial";
}
boosting_->Init(&config_, train_data_, objective_fun_.get(),
Common::ConstPtrInVectorWrapper<Metric>(train_metric_));
}
void MergeFrom(const Booster* other) {
std::lock_guard<std::mutex> lock(mutex_);
boosting_->MergeFrom(other->boosting_.get());
}
~Booster() {
}
void CreateObjectiveAndMetrics() {
// create objective function
objective_fun_.reset(ObjectiveFunction::CreateObjectiveFunction(config_.objective,
config_));
if (objective_fun_ == nullptr) {
Log::Warning("Using self-defined objective function");
}
// initialize the objective function
if (objective_fun_ != nullptr) {
objective_fun_->Init(train_data_->metadata(), train_data_->num_data());
}
// create training metric
train_metric_.clear();
for (auto metric_type : config_.metric) {
auto metric = std::unique_ptr<Metric>(
Metric::CreateMetric(metric_type, config_));
if (metric == nullptr) { continue; }
metric->Init(train_data_->metadata(), train_data_->num_data());
train_metric_.push_back(std::move(metric));
}
train_metric_.shrink_to_fit();
}
void ResetTrainingData(const Dataset* train_data) {
if (train_data != train_data_) {
std::lock_guard<std::mutex> lock(mutex_);
train_data_ = train_data;
CreateObjectiveAndMetrics();
// reset the boosting
boosting_->ResetTrainingData(train_data_,
objective_fun_.get(), Common::ConstPtrInVectorWrapper<Metric>(train_metric_));
}
}
void ResetConfig(const char* parameters) {
std::lock_guard<std::mutex> lock(mutex_);
auto param = Config::Str2Map(parameters);
if (param.count("num_class")) {
Log::Fatal("Cannot change num_class during training");
}
if (param.count("boosting")) {
Log::Fatal("Cannot change boosting during training");
}
if (param.count("metric")) {
Log::Fatal("Cannot change metric during training");
}
config_.Set(param);
if (config_.num_threads > 0) {
omp_set_num_threads(config_.num_threads);
}
if (param.count("objective")) {
// create objective function
objective_fun_.reset(ObjectiveFunction::CreateObjectiveFunction(config_.objective,
config_));
if (objective_fun_ == nullptr) {
Log::Warning("Using self-defined objective function");
}
// initialize the objective function
if (objective_fun_ != nullptr) {
objective_fun_->Init(train_data_->metadata(), train_data_->num_data());
}
boosting_->ResetTrainingData(train_data_,
objective_fun_.get(), Common::ConstPtrInVectorWrapper<Metric>(train_metric_));
}
boosting_->ResetConfig(&config_);
}
void AddValidData(const Dataset* valid_data) {
std::lock_guard<std::mutex> lock(mutex_);
valid_metrics_.emplace_back();
for (auto metric_type : config_.metric) {
auto metric = std::unique_ptr<Metric>(Metric::CreateMetric(metric_type, config_));
if (metric == nullptr) { continue; }
metric->Init(valid_data->metadata(), valid_data->num_data());
valid_metrics_.back().push_back(std::move(metric));
}
valid_metrics_.back().shrink_to_fit();
boosting_->AddValidDataset(valid_data,
Common::ConstPtrInVectorWrapper<Metric>(valid_metrics_.back()));
}
bool TrainOneIter() {
std::lock_guard<std::mutex> lock(mutex_);
return boosting_->TrainOneIter(nullptr, nullptr);
}
void Refit(const int32_t* leaf_preds, int32_t nrow, int32_t ncol) {
std::lock_guard<std::mutex> lock(mutex_);
std::vector<std::vector<int32_t>> v_leaf_preds(nrow, std::vector<int32_t>(ncol, 0));
for (int i = 0; i < nrow; ++i) {
for (int j = 0; j < ncol; ++j) {
v_leaf_preds[i][j] = leaf_preds[i * ncol + j];
}
}
boosting_->RefitTree(v_leaf_preds);
}
bool TrainOneIter(const score_t* gradients, const score_t* hessians) {
std::lock_guard<std::mutex> lock(mutex_);
return boosting_->TrainOneIter(gradients, hessians);
}
void RollbackOneIter() {
std::lock_guard<std::mutex> lock(mutex_);
boosting_->RollbackOneIter();
}
void PredictSingleRow(int num_iteration, int predict_type,
std::function<std::vector<std::pair<int, double>>(int row_idx)> get_row_fun,
const Config& config,
double* out_result, int64_t* out_len) {
std::lock_guard<std::mutex> lock(mutex_);
if (single_row_predictor_.get() == nullptr) {
bool is_predict_leaf = false;
bool is_raw_score = false;
bool predict_contrib = false;
if (predict_type == C_API_PREDICT_LEAF_INDEX) {
is_predict_leaf = true;
} else if (predict_type == C_API_PREDICT_RAW_SCORE) {
is_raw_score = true;
} else if (predict_type == C_API_PREDICT_CONTRIB) {
predict_contrib = true;
} else {
is_raw_score = false;
}
// TODO: config could be optimized away... (maybe using lambda callback?)
single_row_predictor_.reset(new Predictor(boosting_.get(), num_iteration, is_raw_score, is_predict_leaf, predict_contrib,
config.pred_early_stop, config.pred_early_stop_freq, config.pred_early_stop_margin));
single_row_num_pred_in_one_row_ = boosting_->NumPredictOneRow(num_iteration, is_predict_leaf, predict_contrib);
single_row_predict_function_ = single_row_predictor_->GetPredictFunction();
}
auto one_row = get_row_fun(0);
auto pred_wrt_ptr = out_result;
single_row_predict_function_(one_row, pred_wrt_ptr);
*out_len = single_row_num_pred_in_one_row_;
}
void Predict(int num_iteration, int predict_type, int nrow,
std::function<std::vector<std::pair<int, double>>(int row_idx)> get_row_fun,
const Config& config,
double* out_result, int64_t* out_len) {
std::lock_guard<std::mutex> lock(mutex_);
bool is_predict_leaf = false;
bool is_raw_score = false;
bool predict_contrib = false;
if (predict_type == C_API_PREDICT_LEAF_INDEX) {
is_predict_leaf = true;
} else if (predict_type == C_API_PREDICT_RAW_SCORE) {
is_raw_score = true;
} else if (predict_type == C_API_PREDICT_CONTRIB) {
predict_contrib = true;
} else {
is_raw_score = false;
}
Predictor predictor(boosting_.get(), num_iteration, is_raw_score, is_predict_leaf, predict_contrib,
config.pred_early_stop, config.pred_early_stop_freq, config.pred_early_stop_margin);
int64_t num_pred_in_one_row = boosting_->NumPredictOneRow(num_iteration, is_predict_leaf, predict_contrib);
auto pred_fun = predictor.GetPredictFunction();
OMP_INIT_EX();
#pragma omp parallel for schedule(static)
for (int i = 0; i < nrow; ++i) {
OMP_LOOP_EX_BEGIN();
auto one_row = get_row_fun(i);
auto pred_wrt_ptr = out_result + static_cast<size_t>(num_pred_in_one_row) * i;
pred_fun(one_row, pred_wrt_ptr);
OMP_LOOP_EX_END();
}
OMP_THROW_EX();
*out_len = num_pred_in_one_row * nrow;
}
void Predict(int num_iteration, int predict_type, const char* data_filename,
int data_has_header, const Config& config,
const char* result_filename) {
std::lock_guard<std::mutex> lock(mutex_);
bool is_predict_leaf = false;
bool is_raw_score = false;
bool predict_contrib = false;
if (predict_type == C_API_PREDICT_LEAF_INDEX) {
is_predict_leaf = true;
} else if (predict_type == C_API_PREDICT_RAW_SCORE) {
is_raw_score = true;
} else if (predict_type == C_API_PREDICT_CONTRIB) {
predict_contrib = true;
} else {
is_raw_score = false;
}
Predictor predictor(boosting_.get(), num_iteration, is_raw_score, is_predict_leaf, predict_contrib,
config.pred_early_stop, config.pred_early_stop_freq, config.pred_early_stop_margin);
bool bool_data_has_header = data_has_header > 0 ? true : false;
predictor.Predict(data_filename, result_filename, bool_data_has_header);
}
void GetPredictAt(int data_idx, double* out_result, int64_t* out_len) {
boosting_->GetPredictAt(data_idx, out_result, out_len);
}
void SaveModelToFile(int start_iteration, int num_iteration, const char* filename) {
boosting_->SaveModelToFile(start_iteration, num_iteration, filename);
}
void LoadModelFromString(const char* model_str) {
size_t len = std::strlen(model_str);
boosting_->LoadModelFromString(model_str, len);
}
std::string SaveModelToString(int start_iteration, int num_iteration) {
return boosting_->SaveModelToString(start_iteration, num_iteration);
}
std::string DumpModel(int start_iteration, int num_iteration) {
return boosting_->DumpModel(start_iteration, num_iteration);
}
std::vector<double> FeatureImportance(int num_iteration, int importance_type) {
return boosting_->FeatureImportance(num_iteration, importance_type);
}
double GetLeafValue(int tree_idx, int leaf_idx) const {
return dynamic_cast<GBDTBase*>(boosting_.get())->GetLeafValue(tree_idx, leaf_idx);
}
void SetLeafValue(int tree_idx, int leaf_idx, double val) {
std::lock_guard<std::mutex> lock(mutex_);
dynamic_cast<GBDTBase*>(boosting_.get())->SetLeafValue(tree_idx, leaf_idx, val);
}
void ShuffleModels(int start_iter, int end_iter) {
std::lock_guard<std::mutex> lock(mutex_);
boosting_->ShuffleModels(start_iter, end_iter);
}
int GetEvalCounts() const {
int ret = 0;
for (const auto& metric : train_metric_) {
ret += static_cast<int>(metric->GetName().size());
}
return ret;
}
int GetEvalNames(char** out_strs) const {
int idx = 0;
for (const auto& metric : train_metric_) {
for (const auto& name : metric->GetName()) {
std::memcpy(out_strs[idx], name.c_str(), name.size() + 1);
++idx;
}
}
return idx;
}
int GetFeatureNames(char** out_strs) const {
int idx = 0;
for (const auto& name : boosting_->FeatureNames()) {
std::memcpy(out_strs[idx], name.c_str(), name.size() + 1);
++idx;
}
return idx;
}
const Boosting* GetBoosting() const { return boosting_.get(); }
private:
const Dataset* train_data_;
std::unique_ptr<Boosting> boosting_;
std::unique_ptr<Predictor> single_row_predictor_;
PredictFunction single_row_predict_function_;
int64_t single_row_num_pred_in_one_row_;
/*! \brief All configs */
Config config_;
/*! \brief Metric for training data */
std::vector<std::unique_ptr<Metric>> train_metric_;
/*! \brief Metrics for validation data */
std::vector<std::vector<std::unique_ptr<Metric>>> valid_metrics_;
/*! \brief Training objective function */
std::unique_ptr<ObjectiveFunction> objective_fun_;
/*! \brief mutex for threading safe call */
std::mutex mutex_;
};
} // namespace LightGBM
using namespace LightGBM;
// some help functions used to convert data
std::function<std::vector<double>(int row_idx)>
RowFunctionFromDenseMatric(const void* data, int num_row, int num_col, int data_type, int is_row_major);
std::function<std::vector<std::pair<int, double>>(int row_idx)>
RowPairFunctionFromDenseMatric(const void* data, int num_row, int num_col, int data_type, int is_row_major);
std::function<std::vector<std::pair<int, double>>(int idx)>
RowFunctionFromCSR(const void* indptr, int indptr_type, const int32_t* indices,
const void* data, int data_type, int64_t nindptr, int64_t nelem);
// Row iterator of on column for CSC matrix
class CSC_RowIterator {
public:
CSC_RowIterator(const void* col_ptr, int col_ptr_type, const int32_t* indices,
const void* data, int data_type, int64_t ncol_ptr, int64_t nelem, int col_idx);
~CSC_RowIterator() {}
// return value at idx, only can access by ascent order
double Get(int idx);
// return next non-zero pair, if index < 0, means no more data
std::pair<int, double> NextNonZero();
private:
int nonzero_idx_ = 0;
int cur_idx_ = -1;
double cur_val_ = 0.0f;
bool is_end_ = false;
std::function<std::pair<int, double>(int idx)> iter_fun_;
};
// start of c_api functions
const char* LGBM_GetLastError() {
return LastErrorMsg();
}
int LGBM_DatasetCreateFromFile(const char* filename,
const char* parameters,
const DatasetHandle reference,
DatasetHandle* out) {
API_BEGIN();
auto param = Config::Str2Map(parameters);
Config config;
config.Set(param);
if (config.num_threads > 0) {
omp_set_num_threads(config.num_threads);
}
DatasetLoader loader(config, nullptr, 1, filename);
if (reference == nullptr) {
if (Network::num_machines() == 1) {
*out = loader.LoadFromFile(filename, "");
} else {
*out = loader.LoadFromFile(filename, "", Network::rank(), Network::num_machines());
}
} else {
*out = loader.LoadFromFileAlignWithOtherDataset(filename, "",
reinterpret_cast<const Dataset*>(reference));
}
API_END();
}
int LGBM_DatasetCreateFromSampledColumn(double** sample_data,
int** sample_indices,
int32_t ncol,
const int* num_per_col,
int32_t num_sample_row,
int32_t num_total_row,
const char* parameters,
DatasetHandle* out) {
API_BEGIN();
auto param = Config::Str2Map(parameters);
Config config;
config.Set(param);
if (config.num_threads > 0) {
omp_set_num_threads(config.num_threads);
}
DatasetLoader loader(config, nullptr, 1, nullptr);
*out = loader.CostructFromSampleData(sample_data, sample_indices, ncol, num_per_col,
num_sample_row,
static_cast<data_size_t>(num_total_row));
API_END();
}
int LGBM_DatasetCreateByReference(const DatasetHandle reference,
int64_t num_total_row,
DatasetHandle* out) {
API_BEGIN();
std::unique_ptr<Dataset> ret;
ret.reset(new Dataset(static_cast<data_size_t>(num_total_row)));
ret->CreateValid(reinterpret_cast<const Dataset*>(reference));
*out = ret.release();
API_END();
}
int LGBM_DatasetPushRows(DatasetHandle dataset,
const void* data,
int data_type,
int32_t nrow,
int32_t ncol,
int32_t start_row) {
API_BEGIN();
auto p_dataset = reinterpret_cast<Dataset*>(dataset);
auto get_row_fun = RowFunctionFromDenseMatric(data, nrow, ncol, data_type, 1);
OMP_INIT_EX();
#pragma omp parallel for schedule(static)
for (int i = 0; i < nrow; ++i) {
OMP_LOOP_EX_BEGIN();
const int tid = omp_get_thread_num();
auto one_row = get_row_fun(i);
p_dataset->PushOneRow(tid, start_row + i, one_row);
OMP_LOOP_EX_END();
}
OMP_THROW_EX();
if (start_row + nrow == p_dataset->num_data()) {
p_dataset->FinishLoad();
}
API_END();
}
int LGBM_DatasetPushRowsByCSR(DatasetHandle dataset,
const void* indptr,
int indptr_type,
const int32_t* indices,
const void* data,
int data_type,
int64_t nindptr,
int64_t nelem,
int64_t,
int64_t start_row) {
API_BEGIN();
auto p_dataset = reinterpret_cast<Dataset*>(dataset);
auto get_row_fun = RowFunctionFromCSR(indptr, indptr_type, indices, data, data_type, nindptr, nelem);
int32_t nrow = static_cast<int32_t>(nindptr - 1);
OMP_INIT_EX();
#pragma omp parallel for schedule(static)
for (int i = 0; i < nrow; ++i) {
OMP_LOOP_EX_BEGIN();
const int tid = omp_get_thread_num();
auto one_row = get_row_fun(i);
p_dataset->PushOneRow(tid,
static_cast<data_size_t>(start_row + i), one_row);
OMP_LOOP_EX_END();
}
OMP_THROW_EX();
if (start_row + nrow == static_cast<int64_t>(p_dataset->num_data())) {
p_dataset->FinishLoad();
}
API_END();
}
int LGBM_DatasetCreateFromMat(const void* data,
int data_type,
int32_t nrow,
int32_t ncol,
int is_row_major,
const char* parameters,
const DatasetHandle reference,
DatasetHandle* out) {
return LGBM_DatasetCreateFromMats(1,
&data,
data_type,
&nrow,
ncol,
is_row_major,
parameters,
reference,
out);
}
int LGBM_DatasetCreateFromMats(int32_t nmat,
const void** data,
int data_type,
int32_t* nrow,
int32_t ncol,
int is_row_major,
const char* parameters,
const DatasetHandle reference,
DatasetHandle* out) {
API_BEGIN();
auto param = Config::Str2Map(parameters);
Config config;
config.Set(param);
if (config.num_threads > 0) {
omp_set_num_threads(config.num_threads);
}
std::unique_ptr<Dataset> ret;
int32_t total_nrow = 0;
for (int j = 0; j < nmat; ++j) {
total_nrow += nrow[j];
}
std::vector<std::function<std::vector<double>(int row_idx)>> get_row_fun;
for (int j = 0; j < nmat; ++j) {
get_row_fun.push_back(RowFunctionFromDenseMatric(data[j], nrow[j], ncol, data_type, is_row_major));
}
if (reference == nullptr) {
// sample data first
Random rand(config.data_random_seed);
int sample_cnt = static_cast<int>(total_nrow < config.bin_construct_sample_cnt ? total_nrow : config.bin_construct_sample_cnt);
auto sample_indices = rand.Sample(total_nrow, sample_cnt);
sample_cnt = static_cast<int>(sample_indices.size());
std::vector<std::vector<double>> sample_values(ncol);
std::vector<std::vector<int>> sample_idx(ncol);
int offset = 0;
int j = 0;
for (size_t i = 0; i < sample_indices.size(); ++i) {
auto idx = sample_indices[i];
while ((idx - offset) >= nrow[j]) {
offset += nrow[j];
++j;
}
auto row = get_row_fun[j](static_cast<int>(idx - offset));
for (size_t k = 0; k < row.size(); ++k) {
if (std::fabs(row[k]) > kZeroThreshold || std::isnan(row[k])) {
sample_values[k].emplace_back(row[k]);
sample_idx[k].emplace_back(static_cast<int>(i));
}
}
}
DatasetLoader loader(config, nullptr, 1, nullptr);
ret.reset(loader.CostructFromSampleData(Common::Vector2Ptr<double>(sample_values).data(),
Common::Vector2Ptr<int>(sample_idx).data(),
static_cast<int>(sample_values.size()),
Common::VectorSize<double>(sample_values).data(),
sample_cnt, total_nrow));
} else {
ret.reset(new Dataset(total_nrow));
ret->CreateValid(
reinterpret_cast<const Dataset*>(reference));
}
int32_t start_row = 0;
for (int j = 0; j < nmat; ++j) {
OMP_INIT_EX();
#pragma omp parallel for schedule(static)
for (int i = 0; i < nrow[j]; ++i) {
OMP_LOOP_EX_BEGIN();
const int tid = omp_get_thread_num();
auto one_row = get_row_fun[j](i);
ret->PushOneRow(tid, start_row + i, one_row);
OMP_LOOP_EX_END();
}
OMP_THROW_EX();
start_row += nrow[j];
}
ret->FinishLoad();
*out = ret.release();
API_END();
}
int LGBM_DatasetCreateFromCSR(const void* indptr,
int indptr_type,
const int32_t* indices,
const void* data,
int data_type,
int64_t nindptr,
int64_t nelem,
int64_t num_col,
const char* parameters,
const DatasetHandle reference,
DatasetHandle* out) {
API_BEGIN();
auto param = Config::Str2Map(parameters);
Config config;
config.Set(param);
if (config.num_threads > 0) {
omp_set_num_threads(config.num_threads);
}
std::unique_ptr<Dataset> ret;
auto get_row_fun = RowFunctionFromCSR(indptr, indptr_type, indices, data, data_type, nindptr, nelem);
int32_t nrow = static_cast<int32_t>(nindptr - 1);
if (reference == nullptr) {
// sample data first
Random rand(config.data_random_seed);
int sample_cnt = static_cast<int>(nrow < config.bin_construct_sample_cnt ? nrow : config.bin_construct_sample_cnt);
auto sample_indices = rand.Sample(nrow, sample_cnt);
sample_cnt = static_cast<int>(sample_indices.size());
std::vector<std::vector<double>> sample_values(num_col);
std::vector<std::vector<int>> sample_idx(num_col);
for (size_t i = 0; i < sample_indices.size(); ++i) {
auto idx = sample_indices[i];
auto row = get_row_fun(static_cast<int>(idx));
for (std::pair<int, double>& inner_data : row) {
CHECK(inner_data.first < num_col);
if (std::fabs(inner_data.second) > kZeroThreshold || std::isnan(inner_data.second)) {
sample_values[inner_data.first].emplace_back(inner_data.second);
sample_idx[inner_data.first].emplace_back(static_cast<int>(i));
}
}
}
DatasetLoader loader(config, nullptr, 1, nullptr);
ret.reset(loader.CostructFromSampleData(Common::Vector2Ptr<double>(sample_values).data(),
Common::Vector2Ptr<int>(sample_idx).data(),
static_cast<int>(sample_values.size()),
Common::VectorSize<double>(sample_values).data(),
sample_cnt, nrow));
} else {
ret.reset(new Dataset(nrow));
ret->CreateValid(
reinterpret_cast<const Dataset*>(reference));
}
OMP_INIT_EX();
#pragma omp parallel for schedule(static)
for (int i = 0; i < nindptr - 1; ++i) {
OMP_LOOP_EX_BEGIN();
const int tid = omp_get_thread_num();
auto one_row = get_row_fun(i);
ret->PushOneRow(tid, i, one_row);
OMP_LOOP_EX_END();
}
OMP_THROW_EX();
ret->FinishLoad();
*out = ret.release();
API_END();
}
int LGBM_DatasetCreateFromCSRFunc(void* get_row_funptr,
int num_rows,
int64_t num_col,
const char* parameters,
const DatasetHandle reference,
DatasetHandle* out) {
API_BEGIN();
auto get_row_fun = *static_cast<std::function<void(int idx, std::vector<std::pair<int, double>>&)>*>(get_row_funptr);
auto param = Config::Str2Map(parameters);
Config config;
config.Set(param);
if (config.num_threads > 0) {
omp_set_num_threads(config.num_threads);
}
std::unique_ptr<Dataset> ret;
int32_t nrow = num_rows;
if (reference == nullptr) {
// sample data first
Random rand(config.data_random_seed);
int sample_cnt = static_cast<int>(nrow < config.bin_construct_sample_cnt ? nrow : config.bin_construct_sample_cnt);
auto sample_indices = rand.Sample(nrow, sample_cnt);
sample_cnt = static_cast<int>(sample_indices.size());
std::vector<std::vector<double>> sample_values(num_col);
std::vector<std::vector<int>> sample_idx(num_col);
// local buffer to re-use memory
std::vector<std::pair<int, double>> buffer;
for (size_t i = 0; i < sample_indices.size(); ++i) {
auto idx = sample_indices[i];
get_row_fun(static_cast<int>(idx), buffer);
for (std::pair<int, double>& inner_data : buffer) {
CHECK(inner_data.first < num_col);
if (std::fabs(inner_data.second) > kZeroThreshold || std::isnan(inner_data.second)) {
sample_values[inner_data.first].emplace_back(inner_data.second);
sample_idx[inner_data.first].emplace_back(static_cast<int>(i));
}
}
}
DatasetLoader loader(config, nullptr, 1, nullptr);
ret.reset(loader.CostructFromSampleData(Common::Vector2Ptr<double>(sample_values).data(),
Common::Vector2Ptr<int>(sample_idx).data(),
static_cast<int>(sample_values.size()),
Common::VectorSize<double>(sample_values).data(),
sample_cnt, nrow));
} else {
ret.reset(new Dataset(nrow));
ret->CreateValid(
reinterpret_cast<const Dataset*>(reference));
}
OMP_INIT_EX();
std::vector<std::pair<int, double>> threadBuffer;
#pragma omp parallel for schedule(static) private(threadBuffer)
for (int i = 0; i < num_rows; ++i) {
OMP_LOOP_EX_BEGIN();
{
const int tid = omp_get_thread_num();
get_row_fun(i, threadBuffer);
ret->PushOneRow(tid, i, threadBuffer);
}
OMP_LOOP_EX_END();
}
OMP_THROW_EX();
ret->FinishLoad();
*out = ret.release();
API_END();
}
int LGBM_DatasetCreateFromCSC(const void* col_ptr,
int col_ptr_type,
const int32_t* indices,
const void* data,
int data_type,
int64_t ncol_ptr,
int64_t nelem,
int64_t num_row,
const char* parameters,
const DatasetHandle reference,
DatasetHandle* out) {
API_BEGIN();
auto param = Config::Str2Map(parameters);
Config config;
config.Set(param);
if (config.num_threads > 0) {
omp_set_num_threads(config.num_threads);
}
std::unique_ptr<Dataset> ret;
int32_t nrow = static_cast<int32_t>(num_row);
if (reference == nullptr) {
// sample data first
Random rand(config.data_random_seed);
int sample_cnt = static_cast<int>(nrow < config.bin_construct_sample_cnt ? nrow : config.bin_construct_sample_cnt);
auto sample_indices = rand.Sample(nrow, sample_cnt);
sample_cnt = static_cast<int>(sample_indices.size());
std::vector<std::vector<double>> sample_values(ncol_ptr - 1);
std::vector<std::vector<int>> sample_idx(ncol_ptr - 1);
OMP_INIT_EX();
#pragma omp parallel for schedule(static)
for (int i = 0; i < static_cast<int>(sample_values.size()); ++i) {
OMP_LOOP_EX_BEGIN();
CSC_RowIterator col_it(col_ptr, col_ptr_type, indices, data, data_type, ncol_ptr, nelem, i);
for (int j = 0; j < sample_cnt; j++) {
auto val = col_it.Get(sample_indices[j]);
if (std::fabs(val) > kZeroThreshold || std::isnan(val)) {
sample_values[i].emplace_back(val);
sample_idx[i].emplace_back(j);
}
}
OMP_LOOP_EX_END();
}
OMP_THROW_EX();
DatasetLoader loader(config, nullptr, 1, nullptr);
ret.reset(loader.CostructFromSampleData(Common::Vector2Ptr<double>(sample_values).data(),
Common::Vector2Ptr<int>(sample_idx).data(),
static_cast<int>(sample_values.size()),
Common::VectorSize<double>(sample_values).data(),
sample_cnt, nrow));
} else {
ret.reset(new Dataset(nrow));
ret->CreateValid(
reinterpret_cast<const Dataset*>(reference));
}
OMP_INIT_EX();
#pragma omp parallel for schedule(static)
for (int i = 0; i < ncol_ptr - 1; ++i) {
OMP_LOOP_EX_BEGIN();
const int tid = omp_get_thread_num();
int feature_idx = ret->InnerFeatureIndex(i);
if (feature_idx < 0) { continue; }
int group = ret->Feature2Group(feature_idx);
int sub_feature = ret->Feture2SubFeature(feature_idx);
CSC_RowIterator col_it(col_ptr, col_ptr_type, indices, data, data_type, ncol_ptr, nelem, i);
int row_idx = 0;
while (row_idx < nrow) {
auto pair = col_it.NextNonZero();
row_idx = pair.first;
// no more data
if (row_idx < 0) { break; }
ret->PushOneData(tid, row_idx, group, sub_feature, pair.second);
}
OMP_LOOP_EX_END();
}
OMP_THROW_EX();
ret->FinishLoad();
*out = ret.release();
API_END();
}
int LGBM_DatasetGetSubset(
const DatasetHandle handle,
const int32_t* used_row_indices,
int32_t num_used_row_indices,
const char* parameters,
DatasetHandle* out) {
API_BEGIN();
auto param = Config::Str2Map(parameters);
Config config;
config.Set(param);
if (config.num_threads > 0) {
omp_set_num_threads(config.num_threads);
}
auto full_dataset = reinterpret_cast<const Dataset*>(handle);
CHECK(num_used_row_indices > 0);
const int32_t lower = 0;
const int32_t upper = full_dataset->num_data() - 1;
Common::CheckElementsIntervalClosed(used_row_indices, lower, upper, num_used_row_indices, "Used indices of subset");
auto ret = std::unique_ptr<Dataset>(new Dataset(num_used_row_indices));
ret->CopyFeatureMapperFrom(full_dataset);
ret->CopySubset(full_dataset, used_row_indices, num_used_row_indices, true);
*out = ret.release();
API_END();
}
int LGBM_DatasetSetFeatureNames(
DatasetHandle handle,
const char** feature_names,
int num_feature_names) {
API_BEGIN();
auto dataset = reinterpret_cast<Dataset*>(handle);
std::vector<std::string> feature_names_str;
for (int i = 0; i < num_feature_names; ++i) {
feature_names_str.emplace_back(feature_names[i]);
}
dataset->set_feature_names(feature_names_str);
API_END();
}
int LGBM_DatasetGetFeatureNames(
DatasetHandle handle,
char** feature_names,
int* num_feature_names) {
API_BEGIN();
auto dataset = reinterpret_cast<Dataset*>(handle);
auto inside_feature_name = dataset->feature_names();
*num_feature_names = static_cast<int>(inside_feature_name.size());
for (int i = 0; i < *num_feature_names; ++i) {
std::memcpy(feature_names[i], inside_feature_name[i].c_str(), inside_feature_name[i].size() + 1);
}
API_END();
}
#pragma warning(disable : 4702)
int LGBM_DatasetFree(DatasetHandle handle) {
API_BEGIN();
delete reinterpret_cast<Dataset*>(handle);
API_END();
}
int LGBM_DatasetSaveBinary(DatasetHandle handle,
const char* filename) {
API_BEGIN();
auto dataset = reinterpret_cast<Dataset*>(handle);
dataset->SaveBinaryFile(filename);
API_END();
}
int LGBM_DatasetDumpText(DatasetHandle handle,
const char* filename) {
API_BEGIN();
auto dataset = reinterpret_cast<Dataset*>(handle);
dataset->DumpTextFile(filename);
API_END();
}
int LGBM_DatasetSetField(DatasetHandle handle,
const char* field_name,
const void* field_data,
int num_element,
int type) {
API_BEGIN();
auto dataset = reinterpret_cast<Dataset*>(handle);
bool is_success = false;
if (type == C_API_DTYPE_FLOAT32) {
is_success = dataset->SetFloatField(field_name, reinterpret_cast<const float*>(field_data), static_cast<int32_t>(num_element));
} else if (type == C_API_DTYPE_INT32) {
is_success = dataset->SetIntField(field_name, reinterpret_cast<const int*>(field_data), static_cast<int32_t>(num_element));
} else if (type == C_API_DTYPE_FLOAT64) {
is_success = dataset->SetDoubleField(field_name, reinterpret_cast<const double*>(field_data), static_cast<int32_t>(num_element));
}
if (!is_success) { throw std::runtime_error("Input data type error or field not found"); }
API_END();
}
int LGBM_DatasetGetField(DatasetHandle handle,
const char* field_name,
int* out_len,
const void** out_ptr,
int* out_type) {
API_BEGIN();
auto dataset = reinterpret_cast<Dataset*>(handle);
bool is_success = false;
if (dataset->GetFloatField(field_name, out_len, reinterpret_cast<const float**>(out_ptr))) {
*out_type = C_API_DTYPE_FLOAT32;
is_success = true;
} else if (dataset->GetIntField(field_name, out_len, reinterpret_cast<const int**>(out_ptr))) {
*out_type = C_API_DTYPE_INT32;
is_success = true;
} else if (dataset->GetDoubleField(field_name, out_len, reinterpret_cast<const double**>(out_ptr))) {
*out_type = C_API_DTYPE_FLOAT64;
is_success = true;
} else if(dataset->GetInt8Field(field_name, out_len, reinterpret_cast<const int8_t**>(out_ptr))){
*out_type = C_API_DTYPE_INT8;
is_success = true;
}
if (!is_success) { throw std::runtime_error("Field not found"); }
if (*out_ptr == nullptr) { *out_len = 0; }
API_END();
}
int LGBM_DatasetUpdateParam(DatasetHandle handle, const char* parameters) {
API_BEGIN();
auto dataset = reinterpret_cast<Dataset*>(handle);
dataset->ResetConfig(parameters);
API_END();
}
int LGBM_DatasetGetNumData(DatasetHandle handle,
int* out) {
API_BEGIN();
auto dataset = reinterpret_cast<Dataset*>(handle);
*out = dataset->num_data();
API_END();
}
int LGBM_DatasetGetNumFeature(DatasetHandle handle,
int* out) {
API_BEGIN();
auto dataset = reinterpret_cast<Dataset*>(handle);
*out = dataset->num_total_features();
API_END();
}