Using Streams
Specifying the Stream
All operations (including random number generation) take an optional
keyword argument stream. The stream kwarg specifies which
Stream the operation should run on. If the stream is unspecified then
the operation is run on the default stream of the default device:
mx.default_stream(mx.default_device()).  The stream kwarg can also
be a Device (e.g. stream=my_device) in which case the operation is
run on the default stream of the provided device
mx.default_stream(my_device).