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#include <leveldb/db.h>
#include <stdint.h>
#include <string>
#include <vector>
#include "caffe/common.hpp"
#include "caffe/data_layers.hpp"
#include "caffe/layer.hpp"
#include "caffe/proto/caffe.pb.h"
#include "caffe/util/io.hpp"
#include "caffe/util/math_functions.hpp"
#include "caffe/util/rng.hpp"
namespace caffe {
template <typename Dtype>
DataLayer<Dtype>::~DataLayer<Dtype>() {
this->JoinPrefetchThread();
// clean up the database resources
switch (this->layer_param_.data_param().backend()) {
case DataParameter_DB_LEVELDB:
break; // do nothing
case DataParameter_DB_LMDB:
mdb_cursor_close(mdb_cursor_);
mdb_close(mdb_env_, mdb_dbi_);
mdb_txn_abort(mdb_txn_);
mdb_env_close(mdb_env_);
break;
default:
LOG(FATAL) << "Unknown database backend";
}
}
template <typename Dtype>
void DataLayer<Dtype>::DataLayerSetUp(const vector<Blob<Dtype>*>& bottom,
vector<Blob<Dtype>*>* top) {
// Initialize DB
switch (this->layer_param_.data_param().backend()) {
case DataParameter_DB_LEVELDB:
{
leveldb::DB* db_temp;
leveldb::Options options = GetLevelDBOptions();
options.create_if_missing = false;
LOG(INFO) << "Opening leveldb " << this->layer_param_.data_param().source();
leveldb::Status status = leveldb::DB::Open(
options, this->layer_param_.data_param().source(), &db_temp);
CHECK(status.ok()) << "Failed to open leveldb "
<< this->layer_param_.data_param().source() << std::endl
<< status.ToString();
db_.reset(db_temp);
iter_.reset(db_->NewIterator(leveldb::ReadOptions()));
iter_->SeekToFirst();
}
break;
case DataParameter_DB_LMDB:
CHECK_EQ(mdb_env_create(&mdb_env_), MDB_SUCCESS) << "mdb_env_create failed";
CHECK_EQ(mdb_env_set_mapsize(mdb_env_, 1099511627776), MDB_SUCCESS); // 1TB
CHECK_EQ(mdb_env_open(mdb_env_,
this->layer_param_.data_param().source().c_str(),
MDB_RDONLY|MDB_NOTLS, 0664), MDB_SUCCESS) << "mdb_env_open failed";
CHECK_EQ(mdb_txn_begin(mdb_env_, NULL, MDB_RDONLY, &mdb_txn_), MDB_SUCCESS)
<< "mdb_txn_begin failed";
CHECK_EQ(mdb_open(mdb_txn_, NULL, 0, &mdb_dbi_), MDB_SUCCESS)
<< "mdb_open failed";
CHECK_EQ(mdb_cursor_open(mdb_txn_, mdb_dbi_, &mdb_cursor_), MDB_SUCCESS)
<< "mdb_cursor_open failed";
LOG(INFO) << "Opening lmdb " << this->layer_param_.data_param().source();
CHECK_EQ(mdb_cursor_get(mdb_cursor_, &mdb_key_, &mdb_value_, MDB_FIRST),
MDB_SUCCESS) << "mdb_cursor_get failed";
break;
default:
LOG(FATAL) << "Unknown database backend";
}
// Check if we would need to randomly skip a few data points
if (this->layer_param_.data_param().rand_skip()) {
unsigned int skip = caffe_rng_rand() %
this->layer_param_.data_param().rand_skip();
LOG(INFO) << "Skipping first " << skip << " data points.";
while (skip-- > 0) {
switch (this->layer_param_.data_param().backend()) {
case DataParameter_DB_LEVELDB:
iter_->Next();
if (!iter_->Valid()) {
iter_->SeekToFirst();
}
break;
case DataParameter_DB_LMDB:
if (mdb_cursor_get(mdb_cursor_, &mdb_key_, &mdb_value_, MDB_NEXT)
!= MDB_SUCCESS) {
CHECK_EQ(mdb_cursor_get(mdb_cursor_, &mdb_key_, &mdb_value_,
MDB_FIRST), MDB_SUCCESS);
}
break;
default:
LOG(FATAL) << "Unknown database backend";
}
}
}
// Read a data point, and use it to initialize the top blob.
Datum datum;
switch (this->layer_param_.data_param().backend()) {
case DataParameter_DB_LEVELDB:
datum.ParseFromString(iter_->value().ToString());
break;
case DataParameter_DB_LMDB:
datum.ParseFromArray(mdb_value_.mv_data, mdb_value_.mv_size);
break;
default:
LOG(FATAL) << "Unknown database backend";
}
// image
int crop_size = this->layer_param_.transform_param().crop_size();
if (crop_size > 0) {
(*top)[0]->Reshape(this->layer_param_.data_param().batch_size(),
datum.channels(), crop_size, crop_size);
this->prefetch_data_.Reshape(this->layer_param_.data_param().batch_size(),
datum.channels(), crop_size, crop_size);
} else {
(*top)[0]->Reshape(
this->layer_param_.data_param().batch_size(), datum.channels(),
datum.height(), datum.width());
this->prefetch_data_.Reshape(this->layer_param_.data_param().batch_size(),
datum.channels(), datum.height(), datum.width());
}
LOG(INFO) << "output data size: " << (*top)[0]->num() << ","
<< (*top)[0]->channels() << "," << (*top)[0]->height() << ","
<< (*top)[0]->width();
// label
if (this->output_labels_) {
(*top)[1]->Reshape(this->layer_param_.data_param().batch_size(), 1, 1, 1);
this->prefetch_label_.Reshape(this->layer_param_.data_param().batch_size(),
1, 1, 1);
}
// datum size
this->datum_channels_ = datum.channels();
this->datum_height_ = datum.height();
this->datum_width_ = datum.width();
this->datum_size_ = datum.channels() * datum.height() * datum.width();
}
// This function is used to create a thread that prefetches the data.
template <typename Dtype>
void DataLayer<Dtype>::InternalThreadEntry() {
Datum datum;
CHECK(this->prefetch_data_.count());
Dtype* top_data = this->prefetch_data_.mutable_cpu_data();
Dtype* top_label = NULL; // suppress warnings about uninitialized variables
if (this->output_labels_) {
top_label = this->prefetch_label_.mutable_cpu_data();
}
const int batch_size = this->layer_param_.data_param().batch_size();
for (int item_id = 0; item_id < batch_size; ++item_id) {
// get a blob
switch (this->layer_param_.data_param().backend()) {
case DataParameter_DB_LEVELDB:
CHECK(iter_);
CHECK(iter_->Valid());
datum.ParseFromString(iter_->value().ToString());
break;
case DataParameter_DB_LMDB:
CHECK_EQ(mdb_cursor_get(mdb_cursor_, &mdb_key_,
&mdb_value_, MDB_GET_CURRENT), MDB_SUCCESS);
datum.ParseFromArray(mdb_value_.mv_data,
mdb_value_.mv_size);
break;
default:
LOG(FATAL) << "Unknown database backend";
}
// Apply data transformations (mirror, scale, crop...)
this->data_transformer_.Transform(item_id, datum, this->mean_, top_data);
if (this->output_labels_) {
top_label[item_id] = datum.label();
}
// go to the next iter
switch (this->layer_param_.data_param().backend()) {
case DataParameter_DB_LEVELDB:
iter_->Next();
if (!iter_->Valid()) {
// We have reached the end. Restart from the first.
DLOG(INFO) << "Restarting data prefetching from start.";
iter_->SeekToFirst();
}
break;
case DataParameter_DB_LMDB:
if (mdb_cursor_get(mdb_cursor_, &mdb_key_,
&mdb_value_, MDB_NEXT) != MDB_SUCCESS) {
// We have reached the end. Restart from the first.
DLOG(INFO) << "Restarting data prefetching from start.";
CHECK_EQ(mdb_cursor_get(mdb_cursor_, &mdb_key_,
&mdb_value_, MDB_FIRST), MDB_SUCCESS);
}
break;
default:
LOG(FATAL) << "Unknown database backend";
}
}
}
INSTANTIATE_CLASS(DataLayer);
} // namespace caffe