The data science story in Clojure is good and improving fast. Neanderthal is the fastest matrix library available on the JVM. Bayadera is ridiculously fast probabilistic programming (not to mention Anglican, which has a slightly easier API in exchange for perf). There's a lot of activity around Clojure bindings for MXNet, if you want deep learning. It's not mainstream Python, but it's far from limited by community or libraries.