Fetch multi-dimensions arrays

[judah]

Currently, the only options for fetching a multi-dimensional Tensor are lists or Vectors, both of which concatenate it into one dimension. (For example, a shape of [2,2,2] will turn into a shape of [8]). We should allow using a more appropriate Haskell type for such Fetches.

[blackgnezdo]

Is it mostly predicated on us deciding what we want tensors to look like abstracted from TF?