MLUtilsTODO: allow passing a rng as first parameter
"""
randobs(data, [n])
Pick a random observation or a batch of `n` random observations
from `data`.
For this function to work, the type of `data` must implement
[`numobs`](@ref) and [`getobs`](@ref).
"""
randobs
(
data
)
=
getobs
(
data
,
rand
(
1
:
numobs
(
data
)
)
)
randobs
(
data
,
n
)
=
getobs
(
data
,
rand
(
1
:
numobs
(
data
)
,
n
)
)