True Scalar Support

[jeff-hykin]

Love the library! I've been pseudo-polyfilling some of the other pytorch methods, but there was an issue I ran into that I can't find a good workaround for. Because of that I'm not sure if this should be classified as a bug, since its more of a design issue.

In pytorch, doing an operation such as .sum() doesn't produce a vector (shape = [1]), it produces a scalar (shape = []). This solves some edgecases and makes shape validation practical.

Is there any chance js-pytorch will be getting scalar support?