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lua-api.cpp
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lua-api.cpp
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#define LUA_LIB
extern "C" {
#include "lua.h"
#include "lualib.h"
#include "lauxlib.h"
#include "luaT.h"
}
#include <iostream>
#include <TH/TH.h>
#include "picpac.h"
#include "picpac-cv.h"
using namespace std;
using namespace picpac;
namespace {
template <typename T>
struct Extractor {
static T apply (lua_State *);
};
template <>
struct Extractor <int32_t> {
static int32_t apply (lua_State *L) {
return luaL_checkinteger(L, -1);
}
};
template <>
struct Extractor <uint32_t> {
static uint32_t apply (lua_State *L) {
return luaL_checkinteger(L, -1);
}
};
template <>
struct Extractor <float> {
static float apply (lua_State *L) {
return luaL_checknumber(L, -1);
}
};
template <>
struct Extractor <bool> {
static bool apply (lua_State *L) {
return luaT_checkboolean(L, -1);
}
};
template <>
struct Extractor <string> {
static string apply (lua_State *L) {
return luaL_checkstring(L, -1);
}
};
class LuaDict {
lua_State *L;
int idx;
public:
LuaDict (lua_State *L_, int idx_): L(L_), idx(idx_) {
}
template <typename T>
T get (char const *name, T const &def) {
lua_getfield(L, idx, name);
T v;
if (lua_isnil(L, -1)) {
v = def;
}
else {
v = Extractor<T>::apply(L);
}
//lua_pop(L, 1);
return v;
}
};
static char const *TNAME_MODULE = "picpac";
static char const *TNAME_IMAGESTREAM = "picpac.ImageStream";
static char const *TNAME_WRITER = "picpac.Writer";
static int Writer_constructor (lua_State *L) {
const char *db = luaL_checkstring(L, 1);
FileWriter *ss = new FileWriter(fs::path(db), FileWriter::COMPACT);
CHECK(ss) << "failed to construct Writer";
luaT_pushudata(L, ss, TNAME_WRITER);
return 1;
}
static FileWriter *checkWriter (lua_State *L, int n) {
return *(FileWriter **)luaL_checkudata(L, n, TNAME_WRITER);
}
static int Writer_append (lua_State *L) {
FileWriter *ss = checkWriter(L, 1);
if (lua_isnumber(L, 1)) {
Record record(float(luaL_checknumber(L, 1)),
string(luaL_checkstring(L, 2)));
ss->append(record);
}
else {
Record record(0, string(luaL_checkstring(L, 1)),
string(luaL_checkstring(L, 2)));
ss->append(record);
}
return 0;
}
static int Writer_destructor (lua_State *L) {
delete checkWriter(L, 1);
return 0;
}
static int ImageStream_constructor (lua_State *L) {
const char *db = luaL_checkstring(L, 1);
luaL_checktype(L, 2, LUA_TTABLE);
LuaDict dict(L, 2);
BatchImageStream::Config config;
#define PICPAC_CONFIG_UPDATE(C, P) \
C.P = dict.get<decltype(C.P)>(#P, C.P)
PICPAC_CONFIG_UPDATE_ALL(config);
#undef PICPAC_CONFIG_UPDATE
BatchImageStream *ss = new BatchImageStream(db, config);
CHECK(ss) << "failed to construct BatchImageStream";
luaT_pushudata(L, ss, TNAME_IMAGESTREAM);
return 1;
}
static BatchImageStream *checkImageStream (lua_State *L, int n) {
return *(BatchImageStream **)luaL_checkudata(L, n, TNAME_IMAGESTREAM);
}
static int ImageStream_size (lua_State *L) {
BatchImageStream *ss = checkImageStream(L, 1);
lua_pushinteger(L, lua_Integer(ss->size()));
return 1;
}
static int ImageStream_next (lua_State *L) {
BatchImageStream *ss = checkImageStream(L, 1);
//cout << "ImageStream(" << ss << ")::next" << endl;
vector<long> images_dims;
vector<long> labels_dims;
THFloatTensor *images = nullptr;
THFloatTensor *labels = nullptr;
try {
ss->next_shape(&images_dims, &labels_dims);
CHECK(images_dims.size() == 4);
while (labels_dims.size() < 4) labels_dims.push_back(-1);
images = THFloatTensor_newWithSize4d(images_dims[0],
images_dims[1], images_dims[2], images_dims[3]);
CHECK(THFloatTensor_isContiguous(images));
labels = THFloatTensor_newWithSize4d(labels_dims[0],
labels_dims[1], labels_dims[2], labels_dims[3]);
CHECK(THFloatTensor_isContiguous(labels));
float *images_buf = THFloatTensor_data(images);
float *labels_buf = THFloatTensor_data(images);
unsigned padding;
ss->next_fill(images_buf, labels_buf, &padding);
luaT_pushudata(L, images, "torch.FloatTensor");
luaT_pushudata(L, labels, "torch.FloatTensor");
luaT_pushinteger(L, lua_Integer(padding));
return 3;
}
catch (EoS const &) {
THFloatTensor_free(images);
THFloatTensor_free(labels);
lua_pushnil(L);
return 1;
}
}
static int ImageStream_destructor (lua_State *L) {
delete checkImageStream(L, 1);
return 0;
}
}
extern "C" {
LUALIB_API int luaopen_picpac (lua_State *L) {
luaL_Reg PicPacMethods [] = {
{"ImageStream", ImageStream_constructor},
{"Writer", Writer_constructor},
{NULL, NULL}
};
luaL_Reg WriterMethods [] = {
{"append", Writer_append},
{"__gc", Writer_destructor},
{NULL, NULL}
};
luaL_Reg ImageStreamMethods [] = {
{"next", ImageStream_next},
{"size", ImageStream_size},
{"__call", ImageStream_next},
{"__gc", ImageStream_destructor},
{NULL, NULL}
};
luaL_newmetatable(L, TNAME_WRITER);
luaL_register(L, NULL, WriterMethods);
lua_pushvalue(L, -1);
lua_setfield(L, -1, "__index");
luaL_newmetatable(L, TNAME_IMAGESTREAM);
luaL_register(L, NULL, ImageStreamMethods);
lua_pushvalue(L, -1);
lua_setfield(L, -1, "__index");
luaL_newmetatable(L, TNAME_MODULE);
luaL_register(L, NULL, PicPacMethods);
//luaL_setfuncs(L, NULL, ImageStreamMethods);
lua_setglobal(L, "picpac");
return 0;
}
}