Error when working without entity_columns

[joanvaquer]

• DeepEcho version: 0.1.1
• Python version: Python 3.6.9
• Operating System: Ubuntu 18.04.4 LTS

Description

When working on a dataset without entity_columns, a ValueError is raised when calling method describe: ValueError: No group keys passed!.

What I Did

from deepecho.benchmark.dataset import Dataset, make_dataset
from deepecho.demo import load_demo

demo = load_demo()
make_dataset(name='Demo', data=demo, entity_columns=[])
dataset = Dataset('Demo')
dataset.describe()