mirror of https://github.com/triqs/dft_tools
443 lines
16 KiB
Python
443 lines
16 KiB
Python
import copy
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import numpy as np
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from pytriqs.gf.local import GfImFreq, BlockGf
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from ast import literal_eval
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from warnings import warn
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class BlockStructure(object):
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""" Contains information about the Green function structure.
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This class contains information about the structure of the solver
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and sumk Green functions and the mapping between them.
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Parameters
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----------
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gf_struct_sumk : list of list of tuple
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gf_struct_sumk[ish][idx] = (block_name,list of indices in block)
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for correlated shell ish; idx is just a counter in the list
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gf_struct_solver : list of dict
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gf_struct_solver[ish][block] = list of indices in that block
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for *inequivalent* correlated shell ish
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solver_to_sumk : list of dict
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solver_to_sumk[ish][(from_block,from_idx)] = (to_block,to_idx)
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maps from the solver block and index to the sumk block and index
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for *inequivalent* correlated shell ish
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sumk_to_solver : list of dict
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sumk_to_solver[ish][(from_block,from_idx)] = (to_block,to_idx)
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maps from the sumk block and index to the solver block and index
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for *inequivalent* correlated shell ish
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solver_to_sumk_block : list of dict
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solver_to_sumk_block[ish][from_block] = to_block
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maps from the solver block to the sumk block
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for *inequivalent* correlated shell ish
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"""
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def __init__(self,gf_struct_sumk=None,
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gf_struct_solver=None,
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solver_to_sumk=None,
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sumk_to_solver=None,
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solver_to_sumk_block=None):
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self.gf_struct_sumk = gf_struct_sumk
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self.gf_struct_solver = gf_struct_solver
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self.solver_to_sumk = solver_to_sumk
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self.sumk_to_solver = sumk_to_solver
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self.solver_to_sumk_block = solver_to_sumk_block
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@classmethod
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def full_structure(cls,gf_struct,corr_to_inequiv):
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""" Construct structure that maps to itself.
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This has the same structure for sumk and solver, and the
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mapping solver_to_sumk and sumk_to_solver is one-to-one.
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Parameters
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----------
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gf_struct : list of dict
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gf_struct[ish][block] = list of indices in that block
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for (inequivalent) correlated shell ish
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corr_to_inequiv : list
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gives the mapping from correlated shell csh to inequivalent
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correlated shell icsh, so that corr_to_inequiv[csh]=icsh
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e.g. SumkDFT.corr_to_inequiv
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if None, each inequivalent correlated shell is supposed to
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be correspond to just one correlated shell with the same
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index; there is not default, None has to be set explicitly!
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"""
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solver_to_sumk = []
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s2sblock = []
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gs_sumk = []
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for ish in range(len(gf_struct)):
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so2su = {}
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so2sublock = {}
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gss = []
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for block in gf_struct[ish]:
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so2sublock[block]=block
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for ind in gf_struct[ish][block]:
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so2su[(block,ind)]=(block,ind)
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gss.append((block,gf_struct[ish][block]))
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solver_to_sumk.append(so2su)
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s2sblock.append(so2sublock)
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gs_sumk.append(gss)
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# gf_struct_sumk is not given for each inequivalent correlated
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# shell, but for every correlated shell!
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if corr_to_inequiv is not None:
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gs_sumk_all = [None]*len(corr_to_inequiv)
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for i in range(len(corr_to_inequiv)):
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gs_sumk_all[i] = gs_sumk[corr_to_inequiv[i]]
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else:
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gs_sumk_all = gs_sumk
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return cls(gf_struct_solver=copy.deepcopy(gf_struct),
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gf_struct_sumk = gs_sumk_all,
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solver_to_sumk = copy.deepcopy(solver_to_sumk),
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sumk_to_solver = solver_to_sumk,
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solver_to_sumk_block = s2sblock)
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def pick_gf_struct_solver(self,new_gf_struct):
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""" Pick selected orbitals within blocks.
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This throws away parts of the Green's function that (for some
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reason - be sure that you know what you're doing) shouldn't be
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included in the calculation.
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To drop an entire block, just don't include it.
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To drop a certain index within a block, just don't include it.
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If it was before:
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[{'up':[0,1],'down':[0,1],'left':[0,1]}]
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to choose the 0th index of the up block and the 1st index of
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the down block and drop the left block, the new_gf_struct would
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have to be
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[{'up':[0],'down':[1]}]
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Note that the indices will be renamed to be a 0-based
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sequence of integers, i.e. the new structure will actually
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be [{'up':[0],'down':[0]}].
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For dropped indices, sumk_to_solver will map to (None,None).
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Parameters
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----------
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new_gf_struct : list of dict
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formatted the same as gf_struct_solver:
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new_gf_struct[ish][block]=list of indices in that block.
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"""
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for ish in range(len(self.gf_struct_solver)):
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gf_struct = new_gf_struct[ish]
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# create new solver_to_sumk
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so2su={}
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so2su_block = {}
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for blk,idxs in gf_struct.items():
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for i in range(len(idxs)):
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so2su[(blk,i)]=self.solver_to_sumk[ish][(blk,idxs[i])]
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so2su_block[blk]=so2su[(blk,i)][0]
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self.solver_to_sumk[ish] = so2su
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self.solver_to_sumk_block[ish] = so2su_block
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# create new sumk_to_solver
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for k,v in self.sumk_to_solver[ish].items():
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blk,ind=v
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if blk in gf_struct and ind in gf_struct[blk]:
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new_ind = gf_struct[blk].index(ind)
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self.sumk_to_solver[ish][k]=(blk,new_ind)
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else:
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self.sumk_to_solver[ish][k]=(None,None)
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# reindexing gf_struct so that it starts with 0
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for k in gf_struct:
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gf_struct[k]=range(len(gf_struct[k]))
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self.gf_struct_solver[ish]=gf_struct
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def pick_gf_struct_sumk(self,new_gf_struct):
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""" Pick selected orbitals within blocks.
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This throws away parts of the Green's function that (for some
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reason - be sure that you know what you're doing) shouldn't be
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included in the calculation.
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To drop an entire block, just don't include it.
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To drop a certain index within a block, just don't include it.
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If it was before:
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[{'up':[0,1],'down':[0,1],'left':[0,1]}]
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to choose the 0th index of the up block and the 1st index of
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the down block and drop the left block, the new_gf_struct would
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have to be
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[{'up':[0],'down':[1]}]
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Note that the indices will be renamed to be a 0-based
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sequence of integers.
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For dropped indices, sumk_to_solver will map to (None,None).
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Parameters
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----------
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new_gf_struct : list of dict
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formatted the same as gf_struct_solver:
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new_gf_struct[ish][block]=list of indices in that block.
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However, the indices are not according to the solver Gf
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but the sumk Gf.
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"""
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gfs = []
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# construct gfs, which is the equivalent of new_gf_struct
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# but according to the solver Gf, by using the sumk_to_solver
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# mapping
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for ish in range(len(new_gf_struct)):
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gfs.append({})
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for block in new_gf_struct[ish].keys():
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for ind in new_gf_struct[ish][block]:
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ind_sol = self.sumk_to_solver[ish][(block,ind)]
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if not ind_sol[0] in gfs[ish]:
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gfs[ish][ind_sol[0]]=[]
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gfs[ish][ind_sol[0]].append(ind_sol[1])
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self.pick_gf_struct_solver(gfs)
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def map_gf_struct_solver(self,mapping):
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""" Map the Green function structure from one struct to another.
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Parameters
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----------
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mapping : list of dict
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the dict consists of elements
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(from_block,from_index) : (to_block,to_index)
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that maps from one structure to the other
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"""
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for ish in range(len(mapping)):
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gf_struct = {}
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so2su = {}
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su2so = {}
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so2su_block = {}
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for frm,to in mapping[ish].iteritems():
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if not to[0] in gf_struct:
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gf_struct[to[0]]=[]
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gf_struct[to[0]].append(to[1])
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so2su[to]=self.solver_to_sumk[ish][frm]
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su2so[self.solver_to_sumk[ish][frm]]=to
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if to[0] in so2su_block:
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if so2su_block[to[0]] != \
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self.solver_to_sumk_block[ish][frm[0]]:
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warn("solver block '{}' maps to more than one sumk block: '{}', '{}'".format(
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to[0],so2su_block[to[0]],self.solver_to_sumk_block[ish][frm[0]]))
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else:
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so2su_block[to[0]]=\
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self.solver_to_sumk_block[ish][frm[0]]
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for k in self.sumk_to_solver[ish].keys():
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if not k in su2so:
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su2so[k] = (None,None)
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self.gf_struct_solver[ish]=gf_struct
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self.solver_to_sumk[ish]=so2su
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self.sumk_to_solver[ish]=su2so
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self.solver_to_sumk_block[ish]=so2su_block
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def create_gf(self,ish=0,gf_function=GfImFreq,**kwargs):
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""" Create a zero BlockGf having the gf_struct_solver structure.
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When using GfImFreq as gf_function, typically you have to
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supply beta as keyword argument.
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Parameters
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----------
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ish : int
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shell index
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gf_function : constructor
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function used to construct the Gf objects constituting the
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individual blocks; default: GfImFreq
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**kwargs :
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options passed on to the Gf constructor for the individual
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blocks
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"""
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names = self.gf_struct_solver[ish].keys()
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blocks=[]
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for n in names:
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G = gf_function(indices=self.gf_struct_solver[ish][n],**kwargs)
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blocks.append(G)
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G = BlockGf(name_list = names, block_list = blocks)
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return G
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def convert_gf(self,G,G_struct,ish=0,show_warnings=True,**kwargs):
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""" Convert BlockGf from its structure to this structure.
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.. warning::
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Elements that are zero in the new structure due to
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the new block structure will be just ignored, thus
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approximated to zero.
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Parameters
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----------
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G : BlockGf
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the Gf that should be converted
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G_struct : GfStructure
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the structure ofthat G
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ish : int
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shell index
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show_warnings : bool
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whether to show warnings when elements of the Green's
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function get thrown away
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**kwargs :
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options passed to the constructor for the new Gf
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"""
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G_new = self.create_gf(ish=ish,**kwargs)
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for block in G_struct.gf_struct_solver[ish].keys():
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for i1 in G_struct.gf_struct_solver[ish][block]:
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for i2 in G_struct.gf_struct_solver[ish][block]:
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i1_sumk = G_struct.solver_to_sumk[ish][(block,i1)]
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i2_sumk = G_struct.solver_to_sumk[ish][(block,i2)]
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i1_sol = self.sumk_to_solver[ish][i1_sumk]
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i2_sol = self.sumk_to_solver[ish][i2_sumk]
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if i1_sol[0] is None or i2_sol[0] is None:
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if show_warnings:
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warn(('Element {},{} of block {} of G is not present '+
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'in the new structure').format(i1,i2,block))
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continue
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if i1_sol[0]!=i2_sol[0]:
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if show_warnings:
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warn(('Element {},{} of block {} of G is approximated '+
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'to zero to match the new structure.').format(
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i1,i2,block))
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continue
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G_new[i1_sol[0]][i1_sol[1],i2_sol[1]] = \
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G[block][i1,i2]
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return G_new
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def approximate_as_diagonal(self):
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""" Create a structure for a GF with zero off-diagonal elements.
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.. warning::
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In general, this will throw away non-zero elements of the
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Green's function. Be sure to verify whether this approximation
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is justified.
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"""
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self.gf_struct_solver=[]
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self.solver_to_sumk=[]
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self.solver_to_sumk_block=[]
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for ish in range(len(self.sumk_to_solver)):
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self.gf_struct_solver.append({})
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self.solver_to_sumk.append({})
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self.solver_to_sumk_block.append({})
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for frm,to in self.sumk_to_solver[ish].iteritems():
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if to[0] is not None:
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self.gf_struct_solver[ish][frm[0]+'_'+str(frm[1])]=[0]
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self.sumk_to_solver[ish][frm]=(frm[0]+'_'+str(frm[1]),0)
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self.solver_to_sumk[ish][(frm[0]+'_'+str(frm[1]),0)]=frm
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self.solver_to_sumk_block[ish][frm[0]+'_'+str(frm[1])]=frm[0]
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def __eq__(self,other):
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def compare(one,two):
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if type(one)!=type(two):
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return False
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if one is None and two is None:
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return True
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if isinstance(one,list) or isinstance(one,tuple):
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if len(one) != len(two):
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return False
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for x,y in zip(one,two):
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if not compare(x,y):
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return False
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return True
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elif isinstance(one,int):
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return one==two
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elif isinstance(one,str):
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return one==two
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elif isinstance(one,dict):
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if set(one.keys()) != set(two.keys()):
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return False
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for k in set(one.keys()).intersection(two.keys()):
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if not compare(one[k],two[k]):
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return False
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return True
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warn('Cannot compare {}'.format(type(one)))
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return False
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for prop in [ "gf_struct_sumk", "gf_struct_solver",
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"solver_to_sumk", "sumk_to_solver", "solver_to_sumk_block"]:
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if not compare(getattr(self,prop),getattr(other,prop)):
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return False
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return True
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def copy(self):
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return copy.deepcopy(self)
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def __reduce_to_dict__(self):
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""" Reduce to dict for HDF5 export."""
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ret = {}
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for element in [ "gf_struct_sumk", "gf_struct_solver",
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"solver_to_sumk_block"]:
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ret[element] = getattr(self,element)
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def construct_mapping(mapping):
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d = []
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for ish in range(len(mapping)):
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d.append({})
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for k,v in mapping[ish].iteritems():
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d[ish][repr(k)] = repr(v)
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return d
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ret['solver_to_sumk']=construct_mapping(self.solver_to_sumk)
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ret['sumk_to_solver']=construct_mapping(self.sumk_to_solver)
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return ret
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@classmethod
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def __factory_from_dict__(cls,name,D) :
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""" Create from dict for HDF5 import."""
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def reconstruct_mapping(mapping):
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d = []
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for ish in range(len(mapping)):
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d.append({})
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for k,v in mapping[ish].iteritems():
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# literal_eval is a saje alternative to eval
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d[ish][literal_eval(k)] = literal_eval(v)
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return d
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D['solver_to_sumk']=reconstruct_mapping(D['solver_to_sumk'])
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D['sumk_to_solver']=reconstruct_mapping(D['sumk_to_solver'])
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return cls(**D)
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def __str__(self):
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s=''
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s+= "gf_struct_sumk "+str( self.gf_struct_sumk)+'\n'
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s+= "gf_struct_solver "+str(self.gf_struct_solver)+'\n'
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s+= "solver_to_sumk_block "+str(self.solver_to_sumk_block)+'\n'
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for el in ['solver_to_sumk','sumk_to_solver']:
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s+=el+'\n'
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element=getattr(self,el)
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for ish in range(len(element)):
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s+=' shell '+str(ish)+'\n'
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def keyfun(el):
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return '{}_{:05d}'.format(el[0],el[1])
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keys = sorted(element[ish].keys(),key=keyfun)
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for k in keys:
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s+=' '+str(k)+str(element[ish][k])+'\n'
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return s
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from pytriqs.archive.hdf_archive_schemes import register_class
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register_class(BlockStructure)
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