ncon¶
full name: tenpy.algorithms.network_contractor.ncon
parent module:
tenpy.algorithms.network_contractortype: function
-
tenpy.algorithms.network_contractor.ncon(tensor_list, leg_links, sequence)[source]¶ Implementation of
ncon.mfor TeNPy Arrays.This function is a python implementation of
ncon.m(arXiv:1304.6112) for tenpyArray.contract()is a wrapper that translates from a more python/tenpy input style- Parameters
- tensor_listlist of :class:’Array’
Tensors to be contracted.
- leg_linkslist of list of int
Each entry of leg_links describes the connectivity of the corresponding tensor in tensor_list. Each entry is a list that has an entry for each leg of the corresponding tensor. Values
0,1,2,...are labels of contracted legs and should appear exactly twice in leg_links. Values-1,-2,-3,...are labels of uncontracted legs and indicate the final ordering (-1is first axis).- sequencelist of int
The order in which the contractions are to be performed. An entry of network_contractor.outer_product indicates performing an outer product. This corresponds to the zero-in-sequence convention of arXiv:1304.6112
- Returns
- result
Array| complex The number or tensor resulting from the contraction.
- result