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recur-nn-io.c
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recur-nn-io.c
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/* Copyright 2014 Douglas Bagnall <[email protected]> LGPL */
#include "recur-nn.h"
#include <cdb.h>
#include <fcntl.h>
#include <unistd.h>
#include <errno.h>
static const char *FORMAT_VERSION = "save_format_version";
static const uint MAX_METADATA_SIZE = 100 * 1000 * 1000;
int
rnn_save_net(RecurNN *net, const char *filename, int backup){
MAYBE_DEBUG("saving net at generation %d", net->generation);
struct cdb_make cdbm;
int fd = -1;
char tmpfn[] = "tmp_net_XXXXXX";
int ret = 0;
if (net == NULL || filename == NULL)
goto early_error;
fd = mkostemp(tmpfn, O_RDWR | O_CREAT);
if (fd == -1){
perror("can't open temporary file for writing");
goto early_error;
}
ret = cdb_make_start(&cdbm, fd);
if (ret)
goto error;
MAYBE_DEBUG("tmpfn is '%s'; fd %d", tmpfn, fd);
/* Save a version number.
* none (or 0,1): original version
* 2: saves ho_scale
* 3: saves BPTT min_error_factor
* 4: saves bottom layer if applicable
* uses more qualified keys ("net.X", "bptt.X", vs "X")
* 5: includes metadata
* 6: doesn't save BPTT training arrays (e.g. momentum) or hidden state
* 7: includes net->clockwork_cycles
* 8: drops net->clockwork_cycles
* 9: add net->presynaptic_noise
* 10: add net->activation
*/
const int version = 10;
cdb_make_add(&cdbm, FORMAT_VERSION, strlen(FORMAT_VERSION), &version, sizeof(version));
#define SAVE_SCALAR(obj, attr) do { \
char *key = (version >= 4) ? QUOTE(obj) "." QUOTE(attr) : \
QUOTE(attr); \
ret = cdb_make_add(&cdbm, key, (u32)strlen(key), \
&obj->attr, sizeof(obj->attr)); \
if (ret){ \
DEBUG("error %d saving '%s'", ret, key); \
goto error; \
}} while (0)
#define SAVE_ARRAY(obj, attr, len) do { \
char *key = (version >= 4) ? QUOTE(obj) "." QUOTE(attr) : \
QUOTE(attr); \
ret = cdb_make_add(&cdbm, key, strlen(key), \
obj->attr, sizeof(*obj->attr) * len); \
if (ret){ \
DEBUG("error %d saving '%s'", ret, key); \
goto error; \
}} while (0)
/* not saved:
bptt->ih_scale (temporary)
net->real_inputs (pointer)
net->bptt (pointer)
net->log (file handle)
bptt->mem (pointer for deallocation)
bptt arrays (i_error, h_error, o_error, ih_momentum, ho_momentum,
history, ih_delta)
net activations (input_layer, hidden_layer, output_layer)
*/
SAVE_SCALAR(net, i_size);
SAVE_SCALAR(net, h_size);
SAVE_SCALAR(net, o_size);
SAVE_SCALAR(net, input_size);
SAVE_SCALAR(net, hidden_size);
SAVE_SCALAR(net, output_size);
SAVE_SCALAR(net, ih_size);
SAVE_SCALAR(net, ho_size);
SAVE_SCALAR(net, generation);
SAVE_SCALAR(net, flags);
SAVE_SCALAR(net, presynaptic_noise);
SAVE_SCALAR(net, activation);
SAVE_SCALAR(net, rng); /* a struct, should work? */
SAVE_ARRAY(net, ih_weights, net->ih_size);
SAVE_ARRAY(net, ho_weights, net->ho_size);
if (net->metadata){
size_t slen = strlen(net->metadata) + 1;
SAVE_ARRAY(net, metadata, slen);
}
else {
MAYBE_DEBUG("not saving empty net metadata");
}
if ((net->flags & RNN_NET_FLAG_OWN_BPTT) && net->bptt){
RecurNNBPTT *bptt = net->bptt;
SAVE_SCALAR(bptt, depth);
SAVE_SCALAR(bptt, index);
SAVE_SCALAR(bptt, learn_rate);
SAVE_SCALAR(bptt, ho_scale); /*version 2 and above*/
SAVE_SCALAR(bptt, momentum);
SAVE_SCALAR(bptt, momentum_weight);
SAVE_SCALAR(bptt, min_error_factor); /*version 3 and above*/
}
if (net->bottom_layer){
/*version 4+ */
RecurExtraLayer *bottom_layer = net->bottom_layer;
int matrix_size = bottom_layer->i_size * bottom_layer->o_size;
SAVE_SCALAR(bottom_layer, input_size);
SAVE_SCALAR(bottom_layer, output_size);
SAVE_SCALAR(bottom_layer, i_size);
SAVE_SCALAR(bottom_layer, o_size);
SAVE_SCALAR(bottom_layer, learn_rate_scale);
SAVE_SCALAR(bottom_layer, overlap);
SAVE_ARRAY(bottom_layer, weights, matrix_size);
}
#undef SAVE_SCALAR
#undef SAVE_ARRAY
cdb_make_finish(&cdbm);
close(fd);
if (backup){
char *backup_filename;
int size = asprintf(&backup_filename, "%s~", filename);
if (size != -1){
if (size == (int)strlen(filename + 2)){
rename(filename, backup_filename);
}
free(backup_filename);
}
}
/*XXX should check the rename errors */
MAYBE_DEBUG("tmpfn is '%s'; filename is %s; fd %d", tmpfn, filename, fd);
rename(tmpfn, filename);
return 0;
error:
cdb_make_finish(&cdbm);
close(fd);
early_error:
DEBUG("failed to save net %p with fd %d ret %d errno %d filename '%s'",
net, fd, ret, errno, filename ? filename : "(nil, which is the problem)");
return -1;
}
RecurNN*
rnn_load_net(const char *filename){
int fd;
uint vlen;
int ret = 0;
RecurNN tmpnet;
RecurNNBPTT tmpbptt;
RecurExtraLayer tmpbl;
RecurNN *net = &tmpnet;
RecurNNBPTT *bptt = &tmpbptt;
RecurExtraLayer *bottom_layer = &tmpbl;
fd = open(filename, O_RDONLY);
if (fd == -1){
DEBUG("can't open '%s' (%s)", filename, strerror(errno));
goto open_error;
}
int version = 0;
if (cdb_seek(fd, FORMAT_VERSION, strlen(FORMAT_VERSION), &vlen) >= 0){
if (vlen == sizeof(version)){
cdb_bread(fd, &version, vlen);
}
}
/*gather up scalar values in tmpnet/tmpbptt*/
#define READ_SCALAR(obj, attr) do {\
char *key = (version >= 4) ? QUOTE(obj) "." QUOTE(attr) : QUOTE(attr); \
ret = cdb_seek(fd, key, strlen(key), &vlen); \
if (ret < 1){ DEBUG("error %d loading '%s'", ret, key); \
goto pre_alloc_error;} \
if (vlen != sizeof(obj->attr)) { \
DEBUG("size mismatch on '%s->%s' want %u, found %zu", \
QUOTE(obj), QUOTE(attr), vlen, sizeof(obj->attr)); \
goto pre_alloc_error; \
} \
cdb_bread(fd, &obj->attr, vlen); \
} while (0)
#define READ_SCALAR_IF_VERSION_ELSE_DEFAULT(obj, attr, min_version, default) \
do { \
if (version >= min_version){ \
READ_SCALAR(obj, attr); \
} \
else{ \
obj->attr = default; \
} \
}while (0)
READ_SCALAR(net, i_size);
READ_SCALAR(net, h_size);
READ_SCALAR(net, o_size);
READ_SCALAR(net, input_size);
READ_SCALAR(net, hidden_size);
READ_SCALAR(net, output_size);
READ_SCALAR(net, ih_size);
READ_SCALAR(net, ho_size);
READ_SCALAR(net, rng);
READ_SCALAR(net, generation);
READ_SCALAR(net, flags);
READ_SCALAR_IF_VERSION_ELSE_DEFAULT(net, presynaptic_noise, 9, 0);
READ_SCALAR_IF_VERSION_ELSE_DEFAULT(net, activation, 10, RNN_RELU);
if (tmpnet.flags & RNN_NET_FLAG_OWN_BPTT){
READ_SCALAR(bptt, depth);
READ_SCALAR(bptt, learn_rate);
READ_SCALAR(bptt, index);
READ_SCALAR(bptt, momentum);
READ_SCALAR(bptt, momentum_weight);
READ_SCALAR_IF_VERSION_ELSE_DEFAULT(bptt, ho_scale, 2,
((float)net->output_size) / net->hidden_size);
READ_SCALAR_IF_VERSION_ELSE_DEFAULT(bptt, min_error_factor, 3,
BASE_MIN_ERROR_FACTOR * net->h_size);
}
if ((tmpnet.flags & RNN_NET_FLAG_BOTTOM_LAYER) && version >= 4){
READ_SCALAR(bottom_layer, learn_rate_scale);
READ_SCALAR(bottom_layer, input_size);
READ_SCALAR(bottom_layer, output_size);
READ_SCALAR(bottom_layer, i_size);
READ_SCALAR(bottom_layer, o_size);
READ_SCALAR(bottom_layer, overlap);
}
#undef READ_SCALAR
if (tmpnet.flags & RNN_NET_FLAG_BOTTOM_LAYER){
net = rnn_new_with_bottom_layer(tmpbl.input_size, tmpbl.output_size,
tmpnet.hidden_size, tmpnet.output_size, tmpnet.flags, 0, NULL,
tmpbptt.depth, tmpbptt.learn_rate, tmpbptt.momentum,
tmpnet.presynaptic_noise, tmpnet.activation, tmpbl.overlap);
}
else {
net = rnn_new(tmpnet.input_size, tmpnet.hidden_size,
tmpnet.output_size, tmpnet.flags, 0, NULL,
tmpbptt.depth, tmpbptt.learn_rate, tmpbptt.momentum,
tmpnet.presynaptic_noise, tmpnet.activation);
}
bptt = net->bptt;
bottom_layer = net->bottom_layer;
net->rng = tmpnet.rng;
net->generation = tmpnet.generation;
if (bptt){
bptt->index = tmpbptt.index;
bptt->momentum_weight = tmpbptt.momentum_weight;
bptt->ho_scale = tmpbptt.ho_scale;
bptt->min_error_factor = tmpbptt.min_error_factor;
}
#define CHECK_SCALAR(new, tmp, attr) do { \
if (new->attr != tmp.attr){ \
DEBUG("attribute '%s' differs %f vs %f", QUOTE(attr), \
(float)new->attr, (float)tmp.attr); \
goto error;} \
} while (0)
CHECK_SCALAR(net, tmpnet, i_size);
CHECK_SCALAR(net, tmpnet, h_size);
CHECK_SCALAR(net, tmpnet, o_size);
CHECK_SCALAR(net, tmpnet, input_size);
CHECK_SCALAR(net, tmpnet, hidden_size);
CHECK_SCALAR(net, tmpnet, output_size);
CHECK_SCALAR(net, tmpnet, ih_size);
CHECK_SCALAR(net, tmpnet, ho_size);
CHECK_SCALAR(net, tmpnet, rng.a);
CHECK_SCALAR(net, tmpnet, rng.b);
CHECK_SCALAR(net, tmpnet, rng.c);
CHECK_SCALAR(net, tmpnet, rng.d);
CHECK_SCALAR(net, tmpnet, generation);
CHECK_SCALAR(net, tmpnet, flags);
CHECK_SCALAR(net, tmpnet, presynaptic_noise);
CHECK_SCALAR(net, tmpnet, activation);
if (bptt){
CHECK_SCALAR(bptt, tmpbptt, depth);
CHECK_SCALAR(bptt, tmpbptt, index);
CHECK_SCALAR(bptt, tmpbptt, ho_scale);
CHECK_SCALAR(bptt, tmpbptt, min_error_factor);
}
if (net->bottom_layer && 0){//XXX
CHECK_SCALAR(net->bottom_layer, tmpbl, input_size);
CHECK_SCALAR(net->bottom_layer, tmpbl, output_size);
CHECK_SCALAR(net->bottom_layer, tmpbl, i_size);
CHECK_SCALAR(net->bottom_layer, tmpbl, o_size);
CHECK_SCALAR(net->bottom_layer, tmpbl, learn_rate_scale);
CHECK_SCALAR(net->bottom_layer, tmpbl, overlap);
}
#undef CHECK_SCALAR
/* so presumably all the arrays are all allocate and the right size. */
#define READ_ARRAY(obj, attr, size) do { \
char *key = (version >= 4) ? QUOTE(obj) "." QUOTE(attr) : QUOTE(attr); \
ret = cdb_seek(fd, key, strlen(key), &vlen); \
if (ret < 1){ DEBUG("error %d loading '%s'", ret, key); \
goto error;} \
if (vlen != size) { \
DEBUG("array size mismatch on '%s->%s' saved %u, calculated %zu", \
QUOTE(obj), QUOTE(attr), vlen, (size_t)size); \
goto error; \
} \
cdb_bread(fd, obj->attr, size); \
} while (0)
#define READ_FREE_SIZE_ARRAY(obj, attr, max_size, zero_is_error) do { \
char *key = QUOTE(obj) "." QUOTE(attr); \
ret = cdb_seek(fd, key, strlen(key), &vlen); \
if (ret < 1){ \
DEBUG("error %d loading '%s'", ret, key); \
if (zero_is_error){ \
goto error; \
} \
DEBUG("continuing anyway"); \
} \
if (vlen > max_size) { \
DEBUG("size of '%s'(%u) exceeds maximum %u", \
key, vlen, max_size); \
goto error; \
} \
obj->attr = malloc_aligned_or_die(vlen + sizeof(obj->attr[0])); \
cdb_bread(fd, obj->attr, vlen); \
obj->attr[vlen] = 0; /*for strings, restoring terminating \0 */ \
} while (0)
READ_ARRAY(net, ih_weights, net->ih_size * sizeof(float));
READ_ARRAY(net, ho_weights, net->ho_size * sizeof(float));
if (version >= 5){
READ_FREE_SIZE_ARRAY(net, metadata, MAX_METADATA_SIZE, 0);
}
if (bottom_layer){
READ_ARRAY(bottom_layer, weights,
bottom_layer->i_size * bottom_layer->o_size * sizeof(float));
}
#undef READ_ARRAY
#undef READ_FREE_SIZE_ARRAY
close(fd);
DEBUG("successfully loaded net '%s'", filename);
return net;
error:
rnn_delete_net(net);
pre_alloc_error:
close(fd);
open_error:
DEBUG("loading net failed!");
return NULL;
}