Port ensemble. Add Display to naive_bayes (#208)

src/svm/svc.rs

@@ -1119,10 +1119,8 @@ mod tests {
         let svc = SVC::fit(&x, &y, &params).unwrap();
 
         // serialization
-        let _serialized_svc = &serde_json::to_string(&svc).unwrap();
+        let serialized_svc = &serde_json::to_string(&svc).unwrap();
 
-        // println!("{:?}", serialized_svc);
-
-        // TODO: for deserialization, deserialization is needed for `linalg::basic::matrix::DenseMatrix`
+        println!("{:?}", serialized_svc);
     }
 }