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+// Copyright 2016 Google Inc.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.!
+
+#ifndef WORD_MODEL_TRAINER_H_
+#define WORD_MODEL_TRAINER_H_
+
+#include "sentencepiece_model.pb.h"
+#include "trainer_interface.h"
+
+namespace sentencepiece {
+namespace word {
+
+// Trainer class for word model.
+//
+// Word model simply counts the frequency of
+// space-delimited tokens, then keep top
+// |vocab_size| frequent tokens.
+class Trainer : public TrainerInterface {
+ public:
+  Trainer(const TrainerSpec &trainer_spec,
+          const NormalizerSpec &normalizer_spec)
+      : TrainerInterface::TrainerInterface(trainer_spec, normalizer_spec) {}
+
+  void Train() override;
+};
+}  // namespace word
+}  // namespace sentencepiece
+#endif  // WORD_MODEL_TRAINER_H_