Deduplicate TorchTitan main function #1995
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Stack from [ghstack](https://github.com/ezyang/ghstack/tree/0.12.0) (oldest at bottom): * #2002 * #2001 * #1995 * __->__ #1985 We are adding more actions to convert the raw inputs and label. 1. The new CP can do the input/label/BlockMask sharding this in this method. 2. The experimental full dtensor model can simply override this method without changing too many Trainer code. This method is extracted from #1857 Makeing this a standalone PR allows us to continue the two projects above without one blocks another.
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Stack from ghstack (oldest at bottom):
People are creating different train.py and duplicate the
mainfunction. But in realitly people just want to use different Trainer subclasses. This PR creates a main() in torchtitan/train.py to deduplicate the code.