Implement basic operations

[jonysy]

Implement operations commonly found in standard neural network frameworks/libraries. This would allow for benchmarking and comparison testing against other frameworks.

• Basic arithmetic

• 2D Convolution

• 2D Max pooling

• Element-wise nonlinearities (tanh, sin, cos, softplus, log, exp, etc.)

• Basic linear algebra (matrix multiplication, transpose, determinant, trace, inverse)

• Basic reductions (sum, product, etc.)

• Basic logical operators (and, or, not, <=, >=, etc.)

• Logical reductions (all true, any true...)

• Basic shape operators (reorder, reshape, etc.)

• Broadcasting as an explicit operation