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TruncateU.py
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TruncateU.py
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import pyUni10 as uni10
#import sys
#import numpy as np
#import matplotlib.pyplot as plt
#import matplotlib
#import pylab
#import random
import copy
#import time
#import line_profiler
def bond_list_dist(T):
bond_list=list(T.bond())
bond_Inlist=[]
bond_OUTlist=[]
for i in xrange(len(bond_list)):
if bond_list[i].type()== 1:
bond_Inlist.append(bond_list[i])
else:
bond_OUTlist.append(bond_list[i])
return bond_Inlist, bond_OUTlist
#@profile
def setTruncation(theta, chi):
LA=uni10.UniTensor(theta.bond())
GA=uni10.UniTensor(theta.bond())
GB=uni10.UniTensor(theta.bond())
bond_In_list,bond_OUT_list =bond_list_dist(theta)
#print "chi", chi
svds = {}
blk_qnums = theta.blockQnum()
dim_svd=[]
for qnum in blk_qnums:
M_tem=theta.getBlock(qnum)
svds[qnum] = M_tem.svd()
dim_svd.append(int(svds[qnum][1].col()))
svs = []
bidxs = []
for bidx in xrange(len(blk_qnums)):
svs, bidxs = sv_merge1(svs, bidxs, bidx, svds[blk_qnums[bidx]][1], chi, len(blk_qnums))
dims = [0] * len(blk_qnums)
for bidx in bidxs:
dims[bidx] += 1
qnums = []
for bidx in xrange(len(blk_qnums)):
qnums += [blk_qnums[bidx]] * dims[bidx]
bdi_mid = uni10.Bond(uni10.BD_IN, qnums)
#print bdi_mid, "chi", chi
bdo_mid = uni10.Bond(uni10.BD_OUT, qnums)
bond_In_list.append(bdo_mid)
GA.assign(bond_In_list)
bond_OUT_list.insert(0, bdi_mid)
GB.assign(bond_OUT_list)
LA.assign([bdi_mid, bdo_mid])
degs = bdi_mid.degeneracy()
for qnum, dim in degs.iteritems():
if qnum not in svds:
raise Exception("In setTruncaton(): Fatal error.")
svd = svds[qnum]
GA.putBlock(qnum, svd[0].resize(svd[0].row(), dim))
GB.putBlock(qnum, svd[2].resize(dim, svd[2].col()))
LA.putBlock(qnum, svd[1].resize(dim, dim) )
return GA, GB, LA
def sv_merge(svs, bidxs, bidx, sv_mat, chi, len_qn):
#print "chi_in", chi
if(len(svs)):
length = len(svs) + sv_mat.elemNum()
length = length if length < chi else chi
ori_svs = svs
ori_bidxs = bidxs
svs = [0] * length
bidxs = [0] * length
svs = []
bidxs = []
cnt = 0
cur1 = 0
cur2 = 0
while cnt < length:
if(cur1 < len(ori_svs)) and cur2 < sv_mat.elemNum():
if ori_svs[cur1] >= sv_mat[cur2]:
if (ori_svs[cur1] > 1.0e-12):
svs.append(ori_svs[cur1])
bidxs.append(ori_bidxs[cur1])
cur1 += 1
else:
if (sv_mat[cur2] > 1.0e-12):
svs.append( sv_mat[cur2])
bidxs.append(bidx)
cur2 += 1
elif cur2 < sv_mat.elemNum() :
for i in xrange(cnt, length):
if (sv_mat[cur2] > 1.0e-12):
svs.append(sv_mat[cur2])
bidxs.append(bidx)
cur2 += 1
break
else:
for i in xrange(cur1, len(ori_svs)):
svs.append(ori_svs[i])
bidxs.append(ori_bidxs[i])
break
cnt += 1
else:
if (len_qn is 1):
bidxs = [bidx] * chi
svs = [sv_mat[i] for i in xrange(chi)]
elif (sv_mat[0] > 1.0e-12):
bidxs = [bidx] * sv_mat.elemNum()
svs = [sv_mat[i] for i in xrange(sv_mat.elemNum())]
else: bidxs = [bidx]; svs = [sv_mat[0]];
return svs, bidxs
def sv_merge1(svs, bidxs, bidx, sv_mat, chi, len_qn):
if(len(svs)):
length = len(svs) + sv_mat.elemNum()
length = length if length < chi else chi
ori_svs = svs
ori_bidxs = bidxs
svs = [0] * length
bidxs = [0] * length
svs = []
bidxs = []
cnt = 0
cur1 = 0
cur2 = 0
while cnt < length:
if(cur1 < len(ori_svs)) and cur2 < sv_mat.elemNum():
if ori_svs[cur1] >= sv_mat[cur2]:
if (ori_svs[cur1] > -0.01):
svs.append(ori_svs[cur1])
bidxs.append(ori_bidxs[cur1])
cur1 += 1
else:
if (sv_mat[cur2] > -0.01):
svs.append( sv_mat[cur2])
bidxs.append(bidx)
cur2 += 1
elif cur2 < sv_mat.elemNum() :
for i in xrange(cnt, length):
if (sv_mat[cur2] > -0.01):
svs.append(sv_mat[cur2])
bidxs.append(bidx)
cur2 += 1
break
else:
for i in xrange(cur1, len(ori_svs)):
svs.append(ori_svs[i])
bidxs.append(ori_bidxs[i])
break
cnt += 1
else:
if (len_qn is 1):
bidxs = [bidx] * chi
svs = [sv_mat[i] for i in xrange(chi)]
elif (sv_mat[0] > -0.01):
bidxs = [bidx] * sv_mat.elemNum()
svs = [sv_mat[i] for i in xrange(sv_mat.elemNum())]
else: bidxs = [bidx]; svs = [sv_mat[0]];
return svs, bidxs