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// Copyright (C) 2006 Davis E. King (davis@dlib.net)
// License: Boost Software License See LICENSE.txt for the full license.
#include <sstream>
#include <string>
#include <cstdlib>
#include <ctime>
#include <cmath>
#include <dlib/rand.h>
#include <dlib/compress_stream.h>
#include "tester.h"
namespace
{
using namespace test;
using namespace dlib;
using namespace std;
logger dlog("test.rand");
void check_bpp (
const std::string str
)
{
istringstream rdata;
ostringstream sout;
rdata.str(str);
double compressed_size;
compress_stream::kernel_1a cs1;
compress_stream::kernel_2a cs2;
compress_stream_kernel_1<
entropy_encoder_model_kernel_5<257,entropy_encoder::kernel_1a,4000000,4>,
entropy_decoder_model_kernel_5<257,entropy_decoder::kernel_1a,4000000,4>,
crc32::kernel_1a
> cs3;
print_spinner();
rdata.clear();
rdata.seekg(0);
sout.clear();
sout.str("");
cs1.compress(rdata,sout);
compressed_size = sout.str().size();
compressed_size *= 8;
compressed_size /= str.size();
DLIB_TEST_MSG(compressed_size >= 8, "order 0 bps: " << compressed_size);
dlog << LINFO << "order 0: " << compressed_size;
print_spinner();
rdata.clear();
rdata.seekg(0);
sout.clear();
sout.str("");
cs2.compress(rdata,sout);
compressed_size = sout.str().size();
compressed_size *= 8;
compressed_size /= str.size();
DLIB_TEST_MSG(compressed_size >= 8, "order 1 bps: " << compressed_size);
dlog << LINFO << "order 1: " << compressed_size;
print_spinner();
rdata.clear();
rdata.seekg(0);
sout.clear();
sout.str("");
cs3.compress(rdata,sout);
compressed_size = sout.str().size();
compressed_size *= 8;
compressed_size /= str.size();
DLIB_TEST_MSG(compressed_size >= 8, "order 4 bps: " << compressed_size);
dlog << LINFO << "order 4: " << compressed_size;
}
template <
typename rand
>
void rand_test (
)
/*!
requires
- rand is an implementation of rand/rand_kernel_abstract.h
is instantiated with int
ensures
- runs tests on rand for compliance with the specs
!*/
{
ostringstream seed;
seed << (unsigned int)time(0);
ostringstream sout;
rand r, r2;
DLIB_TEST(r.get_seed() == "");
r.set_seed(seed.str());
DLIB_TEST(r.get_seed() == seed.str());
r.clear();
DLIB_TEST(r.get_seed() == "");
swap(r,r2);
DLIB_TEST(r.get_seed() == "");
r.set_seed(seed.str());
DLIB_TEST(r.get_seed() == seed.str());
swap(r,r2);
DLIB_TEST(r2.get_seed() == seed.str());
DLIB_TEST(r.get_seed() == "");
swap(r,r2);
DLIB_TEST(r.get_seed() == seed.str());
DLIB_TEST(r2.get_seed() == "");
print_spinner();
unsigned long size = 100000;
for (unsigned long i = 0; i < size; ++i)
{
uint32 ch = r.get_random_32bit_number();
sout.write((char*)&ch,4);
}
check_bpp(sout.str());
sout.clear();
sout.str("");
print_spinner();
for (unsigned long i = 0; i < size; ++i)
{
uint16 ch = r.get_random_16bit_number();
sout.write((char*)&ch,2);
}
check_bpp(sout.str());
sout.clear();
sout.str("");
print_spinner();
for (unsigned long i = 0; i < size; ++i)
{
unsigned char ch = r.get_random_8bit_number();
sout.write((char*)&ch,1);
}
check_bpp(sout.str());
sout.clear();
sout.str("");
// make sure the things can serialize right
{
r.clear();
r2.clear();
for (int i =0; i < 1000; ++i)
{
r.get_random_32bit_number();
r.get_random_gaussian();
}
ostringstream sout;
serialize(r, sout);
istringstream sin(sout.str());
deserialize(r2, sin);
for (int i =0; i < 1000; ++i)
{
DLIB_TEST(r.get_random_32bit_number() == r2.get_random_32bit_number());
DLIB_TEST(std::abs(r.get_random_gaussian() - r2.get_random_gaussian()) < 1e-14);
}
}
// make sure calling clear() and set_seed("") do the same thing
{
r.clear();
r2.set_seed("");
rand r3;
DLIB_TEST(r.get_seed() == r2.get_seed());
DLIB_TEST(r.get_seed() == r3.get_seed());
for (int i =0; i < 1000; ++i)
{
const uint32 num1 = r.get_random_32bit_number();
const uint32 num2 = r2.get_random_32bit_number();
const uint32 num3 = r3.get_random_32bit_number();
DLIB_TEST( num1 == num2);
DLIB_TEST( num1 == num3);
}
}
}
template <typename rand_type>
void test_normal_numbers(
rand_type& rnd
)
{
dlog << LINFO << "test normality";
double cnt1 = 0; // num <= -1.2
double cnt2 = 0; // num <= -0.5
double cnt3 = 0; // num <= 0
double cnt4 = 0; // num <= 0.5
double cnt5 = 0; // num <= 1.2
const unsigned long total = 1000000;
for (unsigned long i = 0; i < total; ++i)
{
const double r = rnd.get_random_gaussian();
if (r <= -1.2) cnt1 += 1;
if (r <= -0.5) cnt2 += 1;
if (r <= 0) cnt3 += 1;
if (r <= 0.5) cnt4 += 1;
if (r <= 1.2) cnt5 += 1;
}
cnt1 /= total;
cnt2 /= total;
cnt3 /= total;
cnt4 /= total;
cnt5 /= total;
dlog << LINFO << "cnt1: "<< cnt1;
dlog << LINFO << "cnt2: "<< cnt2;
dlog << LINFO << "cnt3: "<< cnt3;
dlog << LINFO << "cnt4: "<< cnt4;
dlog << LINFO << "cnt5: "<< cnt5;
DLIB_TEST(std::abs(cnt1 - 0.11507) < 0.001);
DLIB_TEST(std::abs(cnt2 - 0.30854) < 0.001);
DLIB_TEST(std::abs(cnt3 - 0.5) < 0.001);
DLIB_TEST(std::abs(cnt4 - 0.69146) < 0.001);
DLIB_TEST(std::abs(cnt5 - 0.88493) < 0.001);
}
class rand_tester : public tester
{
public:
rand_tester (
) :
tester ("test_rand",
"Runs tests on the rand component.")
{}
void perform_test (
)
{
dlog << LINFO << "testing kernel_1a";
rand_test<dlib::rand>();
rand_test<dlib::rand>();
dlib::rand rnd;
test_normal_numbers(rnd);
}
} a;
}
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