Changed typing of DatabaseSplit from dict to abc.Mapping

src/ptbench/data/typing.py

@@ -4,6 +4,7 @@
 
 """Defines most common types used in code."""
 
+import collections.abc
 import typing
 
 import torch
@@ -47,12 +48,11 @@ Typically used in data-processing pipelines inside pytorch.
 TransformSequence = typing.Sequence[Transform]
 """A sequence of transforms."""
 
-DatabaseSplit = dict[str, typing.Sequence[typing.Any]]
-"""The definition of a database script.
+DatabaseSplit = collections.abc.Mapping[str, typing.Sequence[typing.Any]]
+"""The definition of a database split.
 
-A database script maps subset names to sequences of objects that,
-through RawDataLoader's eventually become Samples in the processing
-pipeline.
+A database split maps subset names to sequences of objects that, through
+RawDataLoader's eventually become Samples in the processing pipeline.
 """