JamesYang007
add discrete wrapper
The lower-case discrete function needs to be the only way of building Discrete objects. So all Discrete tests need to be changed to use this method. I think you will need to apply the transformation to every element in the vector for it to work. James will have some ideas. The goal is for weights_.[5].get_values() to always work, because the value type is always a Variable (or a Constant, e.g.).
We pushed the current impl of discrete with the intention that we weren't really gonna use it with expressions, but just values. Expressions can have different types and using variadic templates with tuple is like the only way to do this. This gets difficult because you must know the index at compile-time.
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