Better shorthand for expand transformation about tsalib

[ekshaks]

For example, how do we write this down crisply?
np.tile(np.expand_dims([1,2,3],-1), [1,2]).reshape([-1])

[ekshaks]

Option1: Use alignto when all dim vars are defined properly.

B, D = dim_vars('B(b):3, D(d):2')
x: 'b' = np.array([1,2,3])
x = alignto((x,'b'), 'bd', tile=True).reshape(B*D)