[Clojure] Remove unneeded test files

[gigasquid]

Description

Removes unneeded test files from #14800

Checklist

Essentials

Please feel free to remove inapplicable items for your PR.

• To the my best knowledge, examples are either not affected by this change, or have been fixed to be compatible with this change

[gigasquid]

@Chouffe please take a look 👀

[Chouffe]

Should we add those two files in the .gitignore - similar to what we do for the following files:

test/test-ndarray.clj
test/test-ndarray-api.clj
test/test-symbol.clj
test/test-symbol-api.clj

[Chouffe]

Also, not sure how to deal with @kedarbellare great feedback

1. DRY the code a bit (to share as much as possible between symbol/ndarray api and random api)
2. call the scala SymbolRandomAPI and NDArrayRandomAPI
3. unify the random_ and sample_ methods (and remove them from the ndarray/symbol api namespaces)
4. add unit tests

1. Done
2. I could not get this to work when calling directly the `NDArrayRandomAPI` and the `SymbolRandomAPI`
3. This is not done yet. I am not entirely sure how to do that. Can it be done in a subsequent PR?
4. Done

Should we open issues for the things that were not done yet an tackle them in a subsequent PR? @gigasquid and @kedarbellare?

Also, I would like to see some actual unit tests for the generated random and sample functions in the 2 new namespaces. Let me know how we should proceed :)

[gigasquid]

@Chouffe the adding the file to .gitignore is a great idea.

I'm totally cool with opening issues new PR to address the rest of the feedback from @kedarbellare as long as he is cool with it :)

[kedarbellare]

+1 to adding the test-* files to .gitignore. i did the same with the ndarray-api files.

For the NDArrayRandomAPI part, it took some time but you can do something like:

(import '(org.apache.mxnet NDArrayOrScalar))

;; this calls random_exponential
(util/coerce-return
  (NDArrayRandomAPI/exponential
    (util/->option 1.0) ; lam
    (util/->option (mx-shape/->shape [2 1])) ; shape
    (util/->option nil) ; ctx
    (util/->option nil) ; dtype
    (util/->option nil) ; out
    (NDArrayOrScalar. true) ; input lambda is ndarray or scalar?
    nil ; class type
  ))
;; returns 2 x 1 randomly sampled ndarray

;; this calls sample_exponential (concurrent sampling)
(util/coerce-return
  (NDArrayRandomAPI/exponential
    (util/->option (ndarray/ones [3])) ; lam
    (util/->option (mx-shape/->shape [2 1])) ; shape
    (util/->option nil) ; ctx
    (util/->option nil) ; dtype
    (util/->option nil) ; out
    (NDArrayOrScalar. false) ; input lambda is ndarray or scalar?
    nil ; class type
  ))
;; returns 3 x 2 x 1 concurrently sampled ndarray

you can ignore my comment about unifying random/sample or come up with the clojure way of doing this (e.g. using defmulti and defmethod).

doing it in a subsequent PR is fine by me 😃

[kedarbellare]

lgtm (adding it to .gitignore would be great!)

[Chouffe]

alright then! @gigasquid you can add the files in the .gitignore and merge. I will tackle @kedarbellare comments in subsequent PRs then!

[roywei]

@mxnet-label-bot add[Clojure, Test]