Returns the number of models used for fitting.
Note that cv and subsampling objects does not containing any models even though nmod returns a positive number.
# NOT RUN {data(SimData)
lambda <- msgl::lambda(x, classes, alpha = .5, d = 50, lambda.min = 0.05)
fit <- msgl::fit(x, classes, alpha = .5, lambda = lambda)
# the number of modelsnmod(fit)
# }