Remove unused functions in `mlflow.data` module (#6408)
Remove unused functions in `mlflow.data` module (#6408)

* remove unused functions in data

Signed-off-by: harupy <e7c128a96f7b207246da7c828c67136267e8d868@gmail.com>

* Remove unused functions and variables

Signed-off-by: harupy <e7c128a96f7b207246da7c828c67136267e8d868@gmail.com>
mlflow/mlflow,mlflow/mlflow,mlflow/mlflow,mlflow/mlflow,mlflow/mlflow,mlflow/mlflow,mlflow/mlflow