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@ -505,10 +505,11 @@ def eigsolve(num_modes: int,
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symZtD = _symmetrize(Z.conj().T @ D)
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symZtAD = _symmetrize(Z.conj().T @ AD)
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def Qi_func(theta, memo=[None, None]):
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if memo[0] == theta:
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return memo[1]
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Qi_memo = [None, None]
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def Qi_func(theta):
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nonlocal Qi_memo
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if Qi_memo[0] == theta:
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return Qi_memo[1]
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c = numpy.cos(theta)
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s = numpy.sin(theta)
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@ -519,15 +520,15 @@ def eigsolve(num_modes: int,
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logger.info('taylor Qi')
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# if c or s small, taylor expand
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if c < 1e-4 * s and c != 0:
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Qi = numpy.linalg.inv(DtD)
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Qi = Qi / (s*s) - 2*c/(s*s*s) * (Qi @ (Qi @ symZtD).conj().T)
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DtDi = numpy.linalg.inv(DtD)
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Qi = DtDi / (s*s) - 2*c/(s*s*s) * (DtDi @ (DtDi @ symZtD).conj().T)
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elif s < 1e-4 * c and s != 0:
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Qi = numpy.linalg.inv(ZtZ)
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Qi = Qi / (c*c) - 2*s/(c*c*c) * (Qi @ (Qi @ symZtD).conj().T)
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ZtZi = numpy.linalg.inv(ZtZ)
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Qi = ZtZi / (c*c) - 2*s/(c*c*c) * (ZtZi @ (ZtZi @ symZtD).conj().T)
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else:
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raise Exception('Inexplicable singularity in trace_func')
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memo[0] = theta
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memo[1] = Qi
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Qi_memo[0] = theta
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Qi_memo[1] = Qi
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return Qi
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def trace_func(theta):
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