Update files from the datasets library (from 1.6.0)

Release notes: https://github.com/huggingface/datasets/releases/tag/1.6.0

multi_x_science_sum.py

@@ -16,7 +16,6 @@
 # Lint as: python3
 """Multi-XScience Dataset."""
 
-from __future__ import absolute_import, division, print_function
 
 import json