make dataset viewer work

proof-pile.py

@@ -16,9 +16,7 @@
 
 import csv
 import json
-import ndjson
 import os
-import sys # just for debugging, delete
 
 import itertools
 from itertools import islice
@@ -142,7 +140,7 @@ class ProofPile(datasets.GeneratorBasedBuilder):
         key = 0 
         for name in data_files: 
             with open(name) as f: 
-                instances = ndjson.load(f)
+                instances = [json.load(x) for x in f.readlines() if x]
             for instance in instances: 
                 yield key, {"text": instance["text"], 
                         "meta": json.dumps(instance["meta"])}