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[parser] fix another valgrind error in parser training (cstring_array memory can get moved around when using string pointers obtained before adding to it, which can potentially cause a realloc), no longer using the dummy START tags as the feature function can choose to add features for those cases

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Al
2017-03-06 21:39:14 -05:00
parent 754f22c79a
commit cc58ec9db2
1 changed files with 17 additions and 18 deletions
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35
src/averaged_perceptron_trainer.c
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@@ -322,8 +322,8 @@ bool averaged_perceptron_trainer_update_counts(averaged_perceptron_trainer_t *se
bool averaged_perceptron_trainer_train_example(averaged_perceptron_trainer_t *self, void *tagger, void *context, cstring_array *features, cstring_array *prev_tag_features, cstring_array *prev2_tag_features, ap_tagger_feature_function feature_function, tokenized_string_t *tokenized, cstring_array *labels) {
// Keep two tags of history in training
char *prev = START;
char *prev2 = START2;
char *prev = NULL;
char *prev2 = NULL;
uint32_t prev_id = 0;
uint32_t prev2_id = 0;
@@ -337,22 +337,14 @@ bool averaged_perceptron_trainer_train_example(averaged_perceptron_trainer_t *se
for (uint32_t i = 0; i < num_tokens; i++) {
cstring_array_clear(features);
cstring_array_clear(prev_tag_features);
cstring_array_clear(prev2_tag_features);
char *label = cstring_array_get_string(labels, i);
if (label == NULL) {
log_error("label is NULL\n");
}
if (i > 0) {
prev = cstring_array_get_string(self->class_strings, prev_id);
}
if (i > 1) {
prev2 = cstring_array_get_string(self->class_strings, prev2_id);
} else if (i == 1) {
prev2 = START;
}
if (!feature_function(tagger, context, tokenized, i)) {
log_error("Could not add address parser features\n");
return false;
@@ -368,13 +360,20 @@ bool averaged_perceptron_trainer_train_example(averaged_perceptron_trainer_t *se
uint32_t fidx;
const char *feature;
cstring_array_foreach(prev_tag_features, fidx, feature, {
feature_array_add(features, 2, (char *)feature, prev);
})
if (i > 0) {
prev = cstring_array_get_string(self->class_strings, prev_id);
cstring_array_foreach(prev2_tag_features, fidx, feature, {
feature_array_add(features, 3, (char *)feature, prev2, prev);
})
cstring_array_foreach(prev_tag_features, fidx, feature, {
feature_array_add(features, 3, "prev", prev, (char *)feature);
})
if (i > 1) {
prev2 = cstring_array_get_string(self->class_strings, prev2_id);
cstring_array_foreach(prev2_tag_features, fidx, feature, {
feature_array_add(features, 5, "prev2", prev2, "prev", prev, (char *)feature);
})
}
}
uint32_t guess = averaged_perceptron_trainer_predict(self, features);