Fix ManagedDeviceMesh composability issues #86
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There are missing gaps of ManagedDeviceMesh to be actually used in TorchTitan. This PR fixes the gpas: 1. ManagedDeviceMesh is now able to be torch.save()/torch.load(). 2. ManagedDeviceMesh will lie if there are zero replicated group participants. Size 0 DeviceMesh will cause confusion for training loops. 3. Corretly returns coordinates.
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There are missing gaps of ManagedDeviceMesh to be actually used in TorchTitan. This PR fixes the gpas: