batchseq(seqs, pad)

Take a list of N sequences, and turn them into a single sequence where each item is a batch of N. Short sequences will be padded by pad.

Examples

			julia> batchseq([[1, 2, 3], [4, 5]], 0)
3-element Vector{Vector{Int64}}:
 [1, 4]
 [2, 5]
 [3, 0]