1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
extern crate libc;
extern crate crfsuite_sys;
use std::{mem, ptr, fmt, error, slice};
use std::ffi::{CStr, CString};
use crfsuite_sys::*;
#[derive(Debug, Clone, PartialEq)]
pub enum CrfSuiteError {
Incompatible,
InternalLogic,
NotImplemented,
NotSupported,
OutOfMemory,
Overflow,
Unknown
}
impl error::Error for CrfSuiteError {
fn description(&self) -> &str {
match *self {
CrfSuiteError::Incompatible => "Incompatible data",
CrfSuiteError::InternalLogic => "Internal error",
CrfSuiteError::NotImplemented => "Not implemented",
CrfSuiteError::NotSupported => "Unsupported operation",
CrfSuiteError::OutOfMemory => "Insufficient memory",
CrfSuiteError::Overflow => "Overflow",
CrfSuiteError::Unknown => "Unknown error occurred",
}
}
}
impl fmt::Display for CrfSuiteError {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
let desc = match *self {
CrfSuiteError::Incompatible => "Incompatible data",
CrfSuiteError::InternalLogic => "Internal error",
CrfSuiteError::NotImplemented => "Not implemented",
CrfSuiteError::NotSupported => "Unsupported operation",
CrfSuiteError::OutOfMemory => "Insufficient memory",
CrfSuiteError::Overflow => "Overflow",
CrfSuiteError::Unknown => "Unknown error occurred",
};
write!(f, "{}", desc)
}
}
impl From<libc::c_int> for CrfSuiteError {
fn from(code: libc::c_int) -> Self {
match code {
CRFSUITEERR_INCOMPATIBLE => CrfSuiteError::Incompatible,
CRFSUITEERR_INTERNAL_LOGIC => CrfSuiteError::InternalLogic,
CRFSUITEERR_NOTIMPLEMENTED => CrfSuiteError::NotImplemented,
CRFSUITEERR_NOTSUPPORTED => CrfSuiteError::NotSupported,
CRFSUITEERR_OUTOFMEMORY => CrfSuiteError::OutOfMemory,
CRFSUITEERR_OVERFLOW => CrfSuiteError::Overflow,
CRFSUITEERR_UNKNOWN => CrfSuiteError::Unknown,
_ => unreachable!(),
}
}
}
#[derive(Debug, Clone, PartialEq)]
pub enum CrfError {
CrfSuiteError(CrfSuiteError),
CreateInstanceError(String),
ParamNotFound(String),
AlgorithmNotSelected,
EmptyData,
InvalidArgument(String),
ValueError(String),
}
impl error::Error for CrfError {
fn description(&self) -> &str {
match *self {
CrfError::CrfSuiteError(ref err) => err.description(),
CrfError::CreateInstanceError(ref err) => err,
CrfError::ParamNotFound(_) => "Parameter not found",
CrfError::AlgorithmNotSelected => "Trainer algorithm not selected",
CrfError::EmptyData => "Trainer data is empty",
CrfError::InvalidArgument(_) => "Invalid argument",
CrfError::ValueError(_) => "Invalid value",
}
}
}
impl fmt::Display for CrfError {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
match *self {
CrfError::CrfSuiteError(ref err) => err.fmt(f),
CrfError::ParamNotFound(ref name) => write!(f, "Parameter {} not found", name),
CrfError::AlgorithmNotSelected => write!(f, "The trainer is not initialized. Call Trainer::select before Trainer::train."),
CrfError::EmptyData=> write!(f, "The data is empty. Call Trainer::append before Trainer::train."),
CrfError::CreateInstanceError(ref err) |
CrfError::InvalidArgument(ref err) |
CrfError::ValueError(ref err) => err.fmt(f),
}
}
}
pub type Result<T> = ::std::result::Result<T, CrfError>;
#[derive(Debug)]
pub struct Attribute {
pub name: String,
pub value: f64,
}
pub type Item = Vec<Attribute>;
impl Attribute {
pub fn new<T: Into<String>>(name: T, value: f64) -> Self {
Self {
name: name.into(),
value: value
}
}
}
impl<T: Into<String>> From<(T, f64)> for Attribute {
fn from(t: (T, f64)) -> Self {
let (name, value) = t;
Self {
name: name.into(),
value
}
}
}
#[derive(Debug, Clone)]
pub enum Algorithm {
LBFGS,
L2SGD,
AP,
PA,
AROW,
}
impl fmt::Display for Algorithm {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
let desc = match *self {
Algorithm::LBFGS => "lbfgs",
Algorithm::L2SGD => "l2sgd",
Algorithm::AP => "averaged-perceptron",
Algorithm::PA => "passive-aggressive",
Algorithm::AROW => "arow",
};
write!(f, "{}", desc)
}
}
impl ::std::str::FromStr for Algorithm {
type Err = CrfError;
fn from_str(s: &str) -> Result<Self> {
match s {
"lbfgs" => Ok(Algorithm::LBFGS),
"l2sgd" => Ok(Algorithm::L2SGD),
"ap" | "averaged-perceptron" => Ok(Algorithm::AP),
"pa" | "passive-aggressive" => Ok(Algorithm::PA),
"arow" => Ok(Algorithm::AROW),
_ => Err(CrfError::InvalidArgument(s.to_string())),
}
}
}
#[derive(Debug, Clone)]
pub enum GraphicalModel {
CRF1D,
}
impl fmt::Display for GraphicalModel {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
let desc = match *self {
GraphicalModel::CRF1D => "crf1d",
};
write!(f, "{}", desc)
}
}
impl ::std::str::FromStr for GraphicalModel {
type Err = CrfError;
fn from_str(s: &str) -> Result<Self> {
match s {
"1d" | "crf1d" => Ok(GraphicalModel::CRF1D),
_ => Err(CrfError::InvalidArgument(s.to_string())),
}
}
}
#[derive(Debug)]
pub struct Trainer {
data: *mut crfsuite_data_t,
trainer: *mut crfsuite_trainer_t,
}
impl Default for Trainer {
fn default() -> Self {
Trainer::new()
}
}
impl Trainer {
pub fn new() -> Self {
unsafe {
let data_ptr = libc::malloc(mem::size_of::<crfsuite_data_t>()) as *mut crfsuite_data_t;
if !data_ptr.is_null() {
crfsuite_data_init(data_ptr);
}
Self {
data: data_ptr,
trainer: ptr::null_mut()
}
}
}
fn init(&mut self) -> Result<()> {
unsafe {
let interface = CString::new("dictionary").unwrap();
if (*self.data).labels.is_null() {
let ret = crfsuite_create_instance(interface.as_ptr() as *const _, &mut (*self.data).attrs as *mut *mut _ as *mut *mut _);
if ret == 0 {
return Err(CrfError::CreateInstanceError("Failed to create a dictionary instance for attributes.".to_string()));
}
}
if (*self.data).labels.is_null() {
let ret = crfsuite_create_instance(interface.as_ptr() as *const _, &mut (*self.data).labels as *mut *mut _ as *mut *mut _);
if ret == 0 {
return Err(CrfError::CreateInstanceError("Failed to create a dictionary instance for labels.".to_string()));
}
}
}
Ok(())
}
pub fn clear(&mut self) -> Result<()> {
if self.data.is_null() {
return Ok(());
}
unsafe {
if !(*self.data).attrs.is_null() {
(*(*self.data).attrs).release.map(|release| release((*self.data).attrs)).unwrap();
(*self.data).attrs = ptr::null_mut();
}
if !(*self.data).labels.is_null() {
(*(*self.data).labels).release.map(|release| release((*self.data).labels)).unwrap();
(*self.data).labels = ptr::null_mut();
}
crfsuite_data_finish(self.data);
crfsuite_data_init(self.data);
}
Ok(())
}
pub fn append<T: AsRef<str>>(&mut self, xseq: &[Item], yseq: &[T], group: i32) -> Result<()> {
unsafe {
if (*self.data).attrs.is_null() || (*self.data).labels.is_null() {
self.init()?;
}
let xseq_len = xseq.len();
assert_eq!(xseq_len, yseq.len());
let mut instance: crfsuite_instance_t = mem::uninitialized();
crfsuite_instance_init_n(&mut instance, xseq_len as i32);
let crf_items = slice::from_raw_parts_mut(instance.items, instance.num_items as usize);
let crf_labels = slice::from_raw_parts_mut(instance.labels, instance.num_items as usize);
for t in 0..xseq_len {
let items = &xseq[t];
let mut crf_item = &mut crf_items[t];
crfsuite_item_init_n(crf_item, items.len() as i32);
let mut contents = slice::from_raw_parts_mut(crf_item.contents, crf_item.num_contents as usize);
for (content, item) in contents.iter_mut().zip(items) {
let name_cstr = CString::new(&item.name[..]).unwrap();
let aid = (*(*self.data).attrs).get.map(|f| f((*self.data).attrs, name_cstr.as_ptr())).unwrap();
(*content).aid = aid;
(*content).value = item.value;
}
let y_value = yseq[t].as_ref();
let y_cstr = CString::new(y_value).unwrap();
let label = (*(*self.data).labels).get.map(|f| f((*self.data).labels, y_cstr.as_ptr())).unwrap();
crf_labels[t] = label;
}
instance.group = group;
crfsuite_data_append(self.data, &instance);
crfsuite_instance_finish(&mut instance);
}
Ok(())
}
pub fn select(&mut self, algorithm: &Algorithm, typ: &GraphicalModel) -> Result<()> {
unsafe {
if !self.trainer.is_null() {
(*self.trainer).release.map(|f| f(self.trainer)).unwrap();
self.trainer = ptr::null_mut();
}
let mut tid = String::from("train/");
tid.push_str(&typ.to_string());
tid.push_str("/");
tid.push_str(&algorithm.to_string());
let tid_cstr = CString::new(tid).unwrap();
let ret = crfsuite_create_instance(tid_cstr.as_ptr(), &mut self.trainer as *mut *mut _ as *mut *mut _);
if ret == 0 {
return Err(CrfError::CreateInstanceError("Failed to create a instance for trainer.".to_string()));
}
}
Ok(())
}
pub fn train(&mut self, model: &str, holdout: i32) -> Result<()> {
if self.trainer.is_null() {
return Err(CrfError::AlgorithmNotSelected);
}
unsafe {
if (*self.data).attrs.is_null() || (*self.data).labels.is_null() {
return Err(CrfError::EmptyData);
}
let model_cstr = CString::new(model).unwrap();
let ret = (*self.trainer).train.map(|f| f(self.trainer, self.data, model_cstr.as_ptr(), holdout)).unwrap();
if ret != 0 {
return Err(CrfError::CrfSuiteError(CrfSuiteError::from(ret)));
}
}
Ok(())
}
pub fn params(&self) -> Vec<String> {
unsafe {
let pms = (*self.trainer).params.map(|f| f(self.trainer)).unwrap();
let n = (*pms).num.map(|f| f(pms)).unwrap();
let mut ret = Vec::with_capacity(n as usize);
for i in 0..n {
let mut name: *mut libc::c_char = ptr::null_mut();
(*pms).name.map(|f| f(pms, i, &mut name)).unwrap();
let c_str = CStr::from_ptr(name);
ret.push(c_str.to_string_lossy().into_owned());
(*pms).free.map(|f| f(pms, name)).unwrap();
}
ret
}
}
pub fn set(&mut self, name: &str, value: &str) -> Result<()> {
let name_cstr = CString::new(name).unwrap();
let value_cstr = CString::new(value).unwrap();
unsafe {
let pms = (*self.trainer).params.map(|f| f(self.trainer)).unwrap();
if (*pms).set.map(|f| f(pms, name_cstr.as_ptr(), value_cstr.as_ptr())).unwrap() != 0 {
(*pms).release.map(|f| f(pms)).unwrap();
return Err(CrfError::ParamNotFound(name.to_string()));
}
(*pms).release.map(|f| f(pms)).unwrap();
}
Ok(())
}
pub fn get(&self, name: &str) -> Result<String> {
let name_cstr = CString::new(name).unwrap();
let value;
unsafe {
let mut value_ptr: *mut libc::c_char = ptr::null_mut();
let pms = (*self.trainer).params.map(|f| f(self.trainer)).unwrap();
if (*pms).get.map(|f| f(pms, name_cstr.as_ptr(), &mut value_ptr)).unwrap() != 0 {
(*pms).release.map(|f| f(pms)).unwrap();
return Err(CrfError::ParamNotFound(name.to_string()));
}
value = CStr::from_ptr(value_ptr).to_string_lossy().into_owned();
(*pms).free.map(|f| f(pms, value_ptr)).unwrap();
(*pms).release.map(|f| f(pms)).unwrap();
}
Ok(value)
}
pub fn help(&self, name: &str) -> Result<String> {
let name_cstr = CString::new(name).unwrap();
let value;
unsafe {
let mut value_ptr: *mut libc::c_char = ptr::null_mut();
let pms = (*self.trainer).params.map(|f| f(self.trainer)).unwrap();
if (*pms).help.map(|f| f(pms, name_cstr.as_ptr(), ptr::null_mut(), &mut value_ptr)).unwrap() != 0 {
(*pms).release.map(|f| f(pms)).unwrap();
return Err(CrfError::ParamNotFound(name.to_string()));
}
value = CStr::from_ptr(value_ptr).to_string_lossy().into_owned();
(*pms).free.map(|f| f(pms, value_ptr)).unwrap();
(*pms).release.map(|f| f(pms)).unwrap();
}
Ok(value)
}
}
impl Drop for Trainer {
fn drop(&mut self) {
unsafe {
if !self.data.is_null() {
libc::free(self.data as *mut _);
self.data = ptr::null_mut();
}
if !self.trainer.is_null() {
}
}
}
}
#[derive(Debug)]
pub struct Model(*mut crfsuite_model_t);
#[derive(Debug)]
pub struct Tagger<'a> {
model: &'a Model,
tagger: *mut crfsuite_tagger_t,
}
impl Model {
fn new() -> Self {
Model(ptr::null_mut())
}
pub fn from_file(name: &str) -> Result<Self> {
let mut model = Model::new();
model.open(name)?;
Ok(model)
}
fn open(&mut self, name: &str) -> Result<()> {
let name_cstr = CString::new(name).unwrap();
unsafe {
let ret = crfsuite_create_instance_from_file(name_cstr.as_ptr(), &mut self.0 as *mut *mut _ as *mut *mut _);
if ret != 0 {
return Err(CrfError::CreateInstanceError("Failed to create a model instance.".to_string()));
}
}
Ok(())
}
fn close(&mut self) {
unsafe {
if !self.0.is_null() {
(*self.0).release.map(|f| f(self.0)).unwrap();
}
}
}
pub fn tagger(&self) -> Result<Tagger> {
unsafe {
let mut tagger = ptr::null_mut();
let ret = (*self.0).get_tagger.map(|f| f(self.0, &mut tagger)).unwrap();
if ret != 0 {
return Err(CrfError::CrfSuiteError(CrfSuiteError::from(ret)));
}
Ok(Tagger {
model: self,
tagger: tagger
})
}
}
unsafe fn get_attrs(&self) -> Result<*mut crfsuite_dictionary_t> {
let mut attrs: *mut crfsuite_dictionary_t = ptr::null_mut();
let ret = (*self.0).get_attrs.map(|f| f(self.0, &mut attrs)).unwrap();
if ret != 0 {
return Err(CrfError::CrfSuiteError(CrfSuiteError::from(ret)));
}
Ok(attrs)
}
unsafe fn get_labels(&self) -> Result<*mut crfsuite_dictionary_t> {
let mut labels: *mut crfsuite_dictionary_t = ptr::null_mut();
let ret = (*self.0).get_labels.map(|f| f(self.0, &mut labels)).unwrap();
if ret != 0 {
return Err(CrfError::CrfSuiteError(CrfSuiteError::from(ret)));
}
Ok(labels)
}
}
impl Drop for Model {
fn drop(&mut self) {
self.close();
}
}
unsafe impl Send for Model {}
unsafe impl Sync for Model {}
impl<'a> Drop for Tagger<'a> {
fn drop(&mut self) {
unsafe { (*self.tagger).release.map(|f| f(self.tagger)).unwrap(); }
}
}
impl<'a> Tagger<'a> {
pub fn labels(&self) -> Result<Vec<String>> {
unsafe {
let labels = self.model.get_labels()?;
let length = (*labels).num.map(|f| f(labels)).unwrap();
let mut lseq = Vec::with_capacity(length as usize);
for i in 0..length {
let mut label: *mut libc::c_char = ptr::null_mut();
let ret = (*labels).to_string.map(|f| f(labels, i, &mut label as *mut *mut _ as *mut *const _)).unwrap();
if ret != 0 {
(*labels).release.map(|f| f(labels)).unwrap();
return Err(CrfError::CrfSuiteError(CrfSuiteError::from(ret)));
}
lseq.push(CStr::from_ptr(label).to_string_lossy().into_owned());
(*labels).free.map(|f| f(labels, label)).unwrap();
}
(*labels).release.map(|f| f(labels)).unwrap();
Ok(lseq)
}
}
pub fn tag(&mut self, xseq: &[Item]) -> Result<Vec<String>> {
self.set(xseq)?;
self.viterbi()
}
fn set(&mut self, xseq: &[Item]) -> Result<()> {
unsafe {
let mut instance: crfsuite_instance_t = mem::uninitialized();
let attrs = self.model.get_attrs()?;
let xseq_len = xseq.len();
crfsuite_instance_init_n(&mut instance, xseq_len as i32);
let crf_items = slice::from_raw_parts_mut(instance.items, instance.num_items as usize);
for t in 0..xseq_len {
let items = &xseq[t];
let mut crf_item = &mut crf_items[t];
crfsuite_item_init(crf_item);
for attr in items.iter() {
let name_cstr = CString::new(&attr.name[..]).unwrap();
let aid = (*attrs).to_id.map(|f| f(attrs, name_cstr.as_ptr())).unwrap();
if aid >= 0 {
let mut cont: crfsuite_attribute_t = mem::uninitialized();
crfsuite_attribute_set(&mut cont, aid, attr.value);
crfsuite_item_append_attribute(crf_item, &cont);
}
}
}
let ret = (*self.tagger).set.map(|f| f(self.tagger, &mut instance)).unwrap();
if ret != 0 {
(*attrs).release.map(|f| f(attrs)).unwrap();
return Err(CrfError::CrfSuiteError(CrfSuiteError::from(ret)));
}
crfsuite_instance_finish(&mut instance);
(*attrs).release.map(|f| f(attrs)).unwrap();
}
Ok(())
}
pub fn viterbi(&self) -> Result<Vec<String>> {
unsafe {
let length = (*self.tagger).length.map(|f| f(self.tagger)).unwrap();
if length <= 0 {
return Ok(Vec::new());
}
let labels = self.model.get_labels()?;
let mut score: floatval_t = 0.0;
let mut paths: Vec<libc::c_int> = Vec::with_capacity(length as usize);
let ret = (*self.tagger).viterbi.map(|f| f(self.tagger, paths.as_mut_ptr(), &mut score)).unwrap();
if ret != 0 {
(*labels).release.map(|f| f(labels)).unwrap();
return Err(CrfError::CrfSuiteError(CrfSuiteError::from(ret)));
}
paths.set_len(length as usize);
let mut yseq = Vec::with_capacity(length as usize);
for path in paths {
let mut label: *mut libc::c_char = ptr::null_mut();
let ret = (*labels).to_string.map(|f| f(labels, path, &mut label as *mut *mut _ as *mut *const _)).unwrap();
if ret != 0 {
(*labels).release.map(|f| f(labels)).unwrap();
return Err(CrfError::CrfSuiteError(CrfSuiteError::from(ret)));
}
yseq.push(CStr::from_ptr(label).to_string_lossy().into_owned());
(*labels).free.map(|f| f(labels, label)).unwrap();
}
(*labels).release.map(|f| f(labels)).unwrap();
Ok(yseq)
}
}
pub fn probability<T: AsRef<str>>(&self, yseq: &[T]) -> Result<f64> {
let mut score: floatval_t = 0.0;
unsafe {
let length = (*self.tagger).length.map(|f| f(self.tagger)).unwrap() as usize;
if length == 0 {
return Ok(score);
}
if length != yseq.len() {
return Err(CrfError::InvalidArgument(format!("The numbers of items and labels differ: |x| = {}, |y| = {}", length, yseq.len())));
}
let labels = self.model.get_labels()?;
let mut paths: Vec<libc::c_int> = Vec::with_capacity(length);
for y in yseq.iter() {
let y_cstr = CString::new(y.as_ref()).unwrap();
let l = (*labels).to_id.map(|f| f(labels, y_cstr.as_ptr())).unwrap();
if l < 0 {
(*labels).release.map(|f| f(labels)).unwrap();
return Err(CrfError::ValueError(format!("Failed to convert into label identifier: {}", y.as_ref())));
}
paths.push(l);
}
let ret = (*self.tagger).score.map(|f| f(self.tagger, paths.as_mut_ptr(), &mut score)).unwrap();
if ret != 0 {
(*labels).release.map(|f| f(labels)).unwrap();
return Err(CrfError::CrfSuiteError(CrfSuiteError::from(ret)));
}
let mut lognorm: floatval_t = 0.0;
let ret = (*self.tagger).lognorm.map(|f| f(self.tagger, &mut lognorm)).unwrap();
(*labels).release.map(|f| f(labels)).unwrap();
if ret != 0 {
return Err(CrfError::CrfSuiteError(CrfSuiteError::from(ret)));
}
Ok((score - lognorm).exp())
}
}
pub fn marginal(&self, label: &str, position: i32) -> Result<f64> {
let mut prob: floatval_t = 0.0;
unsafe {
let length = (*self.tagger).length.map(|f| f(self.tagger)).unwrap() as usize;
if length == 0 {
return Ok(prob);
}
if position < 0 || length <= position as usize {
return Err(CrfError::InvalidArgument(format!("The position {} is out of range of {}", position, length)));
}
let labels = self.model.get_labels()?;
let y_cstr = CString::new(label).unwrap();
let l = (*labels).to_id.map(|f| f(labels, y_cstr.as_ptr())).unwrap();
if l < 0 {
(*labels).release.map(|f| f(labels)).unwrap();
return Err(CrfError::ValueError(format!("Failed to convert into label identifier: {}", label)));
}
let ret = (*self.tagger).marginal_point.map(|f| f(self.tagger, l, position, &mut prob)).unwrap();
(*labels).release.map(|f| f(labels)).unwrap();
if ret != 0 {
return Err(CrfError::CrfSuiteError(CrfSuiteError::from(ret)));
}
Ok(prob)
}
}
}