Mapping from logical cores in a computation to the physical TPU topology.

Prefer to use the helper to construct a DeviceAssignment; it is easier if less flexible than constructing a DeviceAssignment directly.

topology A Topology object that describes the physical TPU topology.
core_assignment A logical to physical core mapping, represented as a rank 3 numpy array. See the description of the core_assignment property for more details.

ValueError If topology is not Topology object.
ValueError If core_assignment is not a rank 3 numpy array.

core_assignment The logical to physical core mapping.
num_cores_per_replica The number of cores per replica.
num_replicas The number of replicas of the computation.
topology A Topology that describes the TPU topology.