fix building on mac.

Author: foldl

src/tokenizer.cpp

@@ -742,15 +742,15 @@ NearestKeywordSearcher::Node *NearestKeywordSearcher::make_tree(std::vector<Item
     return r;
 }
 
-void NearestKeywordSearcher::rebuild(const std::unordered_map<int, std::string> keywords)
+void NearestKeywordSearcher::rebuild(const std::unordered_map<_vocab::id, std::string> keywords)
 {
     root.reset(nullptr);
 
     std::vector<Item> sub;
 
     for (auto & st: keywords)
     {
-        sub.emplace_back(st.second, st.first);
+        sub.emplace_back(st.second, (int)st.first);
     }
     root.reset(make_tree(sub, 0, -1));
 }

src/tokenizer.h

@@ -196,7 +196,7 @@ class BPEProcessor1: public Processor
 class NearestKeywordSearcher
 {
 public:
-    void rebuild(const std::unordered_map<int, std::string> keywords);
+    void rebuild(const std::unordered_map<_vocab::id, std::string> keywords);
 
     std::string search(std::string &input, int &kw_id) const;