[language_classifier] Language classifier structs, I/O and API

src/language_classifier.h

@@ -0,0 +1,55 @@
+#ifndef LANGUAGE_CLASSIFIER_H
+#define LANGUAGE_CLASSIFIER_H
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <stdint.h>
+#include <stdbool.h>
+
+#include "collections.h"
+#include "language_features.h"
+#include "logistic_regression.h"
+#include "tokens.h"
+#include "string_utils.h"
+#include "trie.h"
+
+#define LANGUAGE_CLASSIFIER_FILENAME "language_classifier.dat"
+#define LANGUAGE_CLASSIFIER_COUNTRY_FILENAME "language_classifier_country.dat"
+
+typedef struct language_classifier {
+    size_t num_labels;
+    size_t num_features;
+    trie_t *features;
+    cstring_array *labels;
+    matrix_t *weights;
+} language_classifier_t;
+
+
+typedef struct language_classifier_response {
+    size_t num_languages;
+    char **languages;
+    double *probs;
+} language_classifier_response_t;
+
+// General usage
+
+language_classifier_t *language_classifier_new(void);
+language_classifier_t *get_language_classifier(void);
+language_classifier_t *get_language_classifier_country(void);
+
+language_classifier_response_t *classify_languages(char *address, char *country);
+
+void language_classifier_destroy(language_classifier_t *self);
+
+// I/O methods
+
+language_classifier_t *language_classifier_load(char *path);
+bool language_classifier_save(language_classifier_t *self, char *output_dir);
+
+// Module setup/teardown
+
+bool language_classifier_module_setup(char *dir);
+void language_classifier_module_teardown(void);
+
+
+#endif