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Summary:
Currently `torchaudio.functional.forced_align` function requires full information on input/target lengths.
When performing non-batched alignment, these can be inferred from the size of Tensor.

Pull Request resolved: https://github.com/pytorch/audio/pull/3533

Reviewed By: nateanl

Differential Revision: D48111041

Pulled By: mthrok

fbshipit-source-id: fbf07124d3959c5cc5533dcd86296851587082fb