完善相关问题，并增加推理的部分代码

app/model/crud/project_train_crud.py

@@ -26,3 +26,14 @@ def get_train_list(project_id: int, session: Session):
     query = session.query(ProjectTrain).filter_by(project_id=project_id).order_by(asc(ProjectTrain.id))
     train_list = [ProjectTrainOut.from_orm(train) for train in query.all()]
     return train_list
+
+
+def get_train(train_id: int, session: Session):
+    """
+    根据id查询训练信息
+    :param train_id:
+    :param session:
+    :return:
+    """
+    train = session.query(ProjectTrain).filter_by(id=train_id).first()
+    return train