def test_hstack(self):
a1 = ctf.astensor(numpy.ones(4))
a2 = ctf.astensor(numpy.ones(5))
self.assertTrue(ctf.hstack((a1, a2)).shape == (9, ))
a1 = ctf.astensor(numpy.ones((2, 4)))
a2 = ctf.astensor(numpy.ones((2, 5)))
self.assertTrue(ctf.hstack((a1, a2)).shape == (2, 9))
a1 = ctf.astensor(numpy.ones((2, 4)))
a2 = ctf.astensor(numpy.ones((2, 5)) + 0j)
self.assertTrue(ctf.hstack((a1, a2)).shape == (2, 9))
self.assertTrue(ctf.hstack((a1, a2)).dtype == numpy.complex128)
a1 = numpy.ones((2, 4))
a2 = ctf.astensor(numpy.ones((2, 5)) + 0j)
self.assertTrue(ctf.hstack((a1, a2)).shape == (2, 9))
na2 = numpy.ones((2, 5)) + 0j
self.assertTrue(
ctf.all(ctf.hstack((a1, a2)) == numpy.hstack((a1, na2))))
a1 = ctf.astensor(numpy.ones(4))
self.assertTrue(ctf.hstack((a1, 1.5)).shape == (5, ))
a1 = ctf.astensor(numpy.ones((2, 4, 2)))
a2 = ctf.astensor(numpy.ones((2, 5, 2)))
self.assertTrue(ctf.hstack((a1, a2)).shape == (2, 9, 2))
def test_hstack(self):
a1 = ctf.astensor(numpy.ones(4))
a2 = ctf.astensor(numpy.ones(5))
self.assertTrue(ctf.hstack((a1, a2)).shape == (9,))
a1 = ctf.astensor(numpy.ones((2,4)))
a2 = ctf.astensor(numpy.ones((2,5)))
self.assertTrue(ctf.hstack((a1, a2)).shape == (2,9))
a1 = ctf.astensor(numpy.ones((2,4)))
a2 = ctf.astensor(numpy.ones((2,5))+0j)
self.assertTrue(ctf.hstack((a1, a2)).shape == (2,9))
self.assertTrue(ctf.hstack((a1, a2)).dtype == numpy.complex128)
a1 = numpy.ones((2,4))
a2 = ctf.astensor(numpy.ones((2,5))+0j)
self.assertTrue(ctf.hstack((a1, a2)).shape == (2,9))
na2 = numpy.ones((2,5))+0j
self.assertTrue(ctf.all(ctf.hstack((a1, a2)) == numpy.hstack((a1,na2))))
a1 = ctf.astensor(numpy.ones(4))
self.assertTrue(ctf.hstack((a1, 1.5)).shape == (5,))
a1 = ctf.astensor(numpy.ones((2,4,2)))
a2 = ctf.astensor(numpy.ones((2,5,2)))
self.assertTrue(ctf.hstack((a1, a2)).shape == (2,9,2))
def amplitudes_to_vector(self, t1, t2, out=None):
vector = ctf.hstack((t1.array.ravel(), t2.array.ravel()))
return vector
def davidson(mult_by_A, N, neig, x0=None, Adiag=None, verbose=4):
"""Diagonalize a matrix via non-symmetric Davidson algorithm.
mult_by_A() is a function which takes a vector of length N
and returns a vector of length N.
neig is the number of eigenvalues requested
"""
if rank == 0:
log = lib.logger.Logger(sys.stdout, verbose)
else:
log = lib.logger.Logger(sys.stdout, 0)
cput1 = (time.clock(), time.time())
Mmin = min(neig, N)
Mmax = min(N, 2000)
tol = 1e-6
def mult(arg):
return mult_by_A(arg)
if Adiag is None:
Adiag = np.zeros(N, np.complex)
for i in range(N):
test = np.zeros(N, np.complex)
test[i] = 1.0
Adiag[i] = mult(test)[i]
else:
Adiag = Adiag.to_nparray()
idx = Adiag.argsort()
lamda_k_old = 0
lamda_k = 0
target = 0
conv = False
if x0 is not None:
assert x0.shape == (Mmin, N)
b = x0.copy()
Ab = tuple([mult(b[m, :]) for m in range(Mmin)])
Ab = ctf.vstack(Ab).transpose()
evals = np.zeros(neig, dtype=np.complex)
evecs = []
for istep, M in enumerate(range(Mmin, Mmax + 1)):
if M == Mmin:
b = ctf.zeros((N, M))
if rank == 0:
ind = [i * M + m for m, i in zip(range(M), idx)]
fill = np.ones(len(ind))
b.write(ind, fill)
else:
b.write([], [])
Ab = tuple([mult(b[:, m]) for m in range(M)])
Ab = ctf.vstack(Ab).transpose()
else:
Ab = ctf.hstack((Ab, mult(b[:, M - 1]).reshape(N, -1)))
Atilde = ctf.dot(b.conj().transpose(), Ab)
Atilde = Atilde.to_nparray()
lamda, alpha = diagonalize_asymm(Atilde)
lamda_k_old, lamda_k = lamda_k, lamda[target]
alpha_k = ctf.astensor(alpha[:, target])
if M == Mmax:
break
q = ctf.dot(Ab - lamda_k * b, alpha_k)
qnorm = ctf.norm(q)
log.info(
'davidson istep = %d root = %d E = %.15g dE = %.9g residual = %.6g',
istep, target, lamda_k.real, (lamda_k - lamda_k_old).real, qnorm)
cput1 = log.timer('davidson iter', *cput1)
if ctf.norm(q) < tol:
evecs.append(ctf.dot(b, alpha_k))
evals[target] = lamda_k
if target == neig - 1:
conv = True
break
else:
target += 1
eps = 1e-10
xi = q / (lamda_k - Adiag + eps)
bxi, R = ctf.qr(ctf.hstack((b, xi.reshape(N, -1))))
nlast = bxi.shape[-1] - 1
b = ctf.hstack(
(b, bxi[:, nlast].reshape(N, -1))
) #can not replace nlast with -1, (inconsistent between numpy and ctf)
evecs = ctf.vstack(tuple(evecs))
return conv, evals, evecs
def hstack(self, tensors):
return self.tensor(ctf.hstack(tuple(tsr.unwrap() for tsr in tensors)))
def amplitudes_to_vector(eom, r1, r2):
vector = ctf.hstack((r1.array.ravel(), r2.array.ravel()))
return vector
