Create Sparse CP ALS Proof of concept

[ntjohnson1]

• Sparse Tensor Methods
  • ndims
  • norm
  • shape slice
  • mttkrp (partial implementation that only takes in factors, but not full ktensor)
    • ttv (needed for mttkrp)
      • Might require rust version of accumarray from numpy groupies or workaround
  • innerprod
    • find
• CP ALS
  • Update Args Struct to handle Sparse and Dense tensors (potentially via traits/generics)

[ntjohnson1]

An option to define a variety of tensor traits then per algorithm can name the required combination https://stackoverflow.com/questions/26983355/is-there-a-way-to-combine-multiple-traits-in-order-to-define-a-new-trait