Enable generic dimentionality for input #41
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MegaBlocks currently assumes a 3D input
[sl, bs, hs]when in fact MegaBlocks should be able to operate on inputs of any multi-dim shape[*, hs]The changes in this PR enable that.
Useful for padded inputs. If we flatten padded inputs with shape:
[sl, bs, hs]into input with shape:[sl * bs - num_pad_tok, hs], then pad tokens are not part of all2all routing and lbl isn't computed on padding tokens.