# 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. |