Node data types

Each graph operation creates a node, and each node has a type corresponding to the type of the data it produces.

ConvolutionKernel	A kernel to be used in a convolution.
FilterFunction	A tensor-valued filter function result.
Pwc	A piecewise-constant tensor-valued function of time (or batch of such functions).
SparsePwc	A piecewise-constant sparse-matrix-valued function of time.
Stf	A sampleable tensor-valued function of time (or batch of such functions).
Target	A target gate for an infidelity calculation.
Tensor	A multi-dimensional array of data.