Tensors are N-dimensional vectors/matrices. More complicated such as convolution and tensor inner/outer products are difficult to visualize and test. Here's where cymbal steps in.
The most simply way to visualize these is to represent every element in a tensor by a unique id, then represent every tensor operation as single or composite operation against the unique id(s).
The library //cymbal_poc:cymbal provides a basic API for defining a tensor and limited operations against it. See //cymbal_poc:test for examples.
Expression Specs defines the cymbal meta language