Update files from the datasets library (from 1.6.0)

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

README.md

@@ -13,12 +13,8 @@ size_categories:
   - 10K<n<100K
   dictionary:
   - 100K<n<1M
-  phrases:
-  - 100K<n<1M
   ptb:
   - 10K<n<100K
-  sentences:
-  - 10K<n<100K
 source_datasets: []
 task_categories:
 - text-classification

sst.py

@@ -14,7 +14,6 @@
 # limitations under the License.
 """TODO: Add a description here."""
 
-from __future__ import absolute_import, division, print_function
 
 import csv
 import os