tc/split with k-fold=1 produces only "train" #175
Description
when using tc/split and k-fold with k=1
we don't get [{:train xxx :test xxx]), as expected
but only [{:text xxx})
in my view k=1, should result in the same as :hold-out
{{ message }}
when using tc/split and k-fold with k=1
we don't get [{:train xxx :test xxx]), as expected
but only [{:text xxx})
in my view k=1, should result in the same as :hold-out