Derive clone for TrainerWrapper (#1317)

tokenizers/src/models/mod.rs

@@ -140,7 +140,7 @@ impl Model for ModelWrapper {
     }
 }
 
-#[derive(Serialize, Deserialize)]
+#[derive(Clone, Serialize, Deserialize)]
 pub enum TrainerWrapper {
     BpeTrainer(BpeTrainer),
     WordPieceTrainer(WordPieceTrainer),

tokenizers/src/models/wordpiece/trainer.rs

@@ -88,7 +88,7 @@ impl WordPieceTrainerBuilder {
 }
 
 /// Trains a `WordPiece` model.
-#[derive(Default, Deserialize, Serialize)]
+#[derive(Default, Clone, Deserialize, Serialize)]
 pub struct WordPieceTrainer {
     bpe_trainer: BpeTrainer,
 }