In a thread-based environment, you can use reset only with the
following datastores:
ImageDatastore objects
CombinedDatastore, SequentialDatastore, or
TransformedDatastore objects you create from
ImageDatastore objects by using
combine or transform
You can use reset with other datastores if you have Parallel Computing Toolbox™. To do so, run the function using a process-backed parallel pool instead of
using backgroundPool or ThreadPool (use either
ProcessPool or ClusterPool).
You can also select a web site from the following list
How to Get Best Site Performance
Select the China site (in Chinese or English) for best site performance. Other MathWorks country sites are not optimized for visits from your location.