Consider all prefixes of a tensor sharding so that largest available prefix can be assigned to factors. #223
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Consider all prefixes of a tensor sharding so that largest available prefix can be assigned to factors.
For example, if factor i has [x,y] and [x,z] shardings, and both [y] and [z] are used by other factors, factor i should be able to get assigned to [x] even though neither [x,y] nor [x,z] is available.