Given that DataLoader implements `length` shouldn't it also be able to provide size? about flux.jl

[ToucheSir]

size is defined to return a tuple, instead of a single int, so almost. I'd have a look at the docs/REPL help for size and try it out on a couple of different AbstractVector subtypes to get a feel for how it should be implemented.

[mcabbott]

Note BTW that the code for this lives in MLUtils.jl, not in the Flux.jl repository: https://github.com/JuliaML/MLUtils.jl/blob/main/src/eachobs.jl#L186

Should be an easy PR to add this, Base.size(d::DataLoader) = (length(d),) and a test.

At least if I'm thinking correctly. The size should always be the size of collect(d), and this will always be a 1-dimensional container, Vector, I think.

[re1san]

Where should the tests be added? Should it be added in https://github.com/JuliaML/MLUtils.jl/blob/main/test/dataloader.jl?

[re1san]

Hey, I would like to work on it. If I am understanding it correctly there should be a function Base.size(d::DataLoader) that returns the same thing as length right?