hack to stop tqdm hanging

allennlp/common/tqdm.py

@@ -4,6 +4,13 @@
 """
 
 from tqdm import tqdm as _tqdm
+# This is neccesary to stop tqdm from hanging
+# when exceptions are raised inside iterators.
+# It should have been fixed in 4.2.1, but it still
+# occurs.
+# TODO(Mark): Remove this once tqdm cleans up after itself properly.
+# https://github.com/tqdm/tqdm/issues/469
+_tqdm.monitor_interval = 0
 
 class Tqdm:
     # These defaults are the same as the argument defaults in tqdm.