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Context: Currently in develop, there is no interface explicitly defined for the handling of batch dims. This makes things such as adding new batch dimensions (e.g. for measurement outcomes) difficult. Additionally, we wish to introduce the concept of "batch labels" where ideally some class is responsible for the handling of batch labels. As such, in this PR we introduce the
Batch
class.Description of the Change: Introduce the
Batch
class.Benefits: Having a concrete interface means a cleaner, safer implementation of batching where we can now define arbitrary batch dims and attribute batch labels to them (for mrm einsum).