optimizer#

Quantum natural gradient descent#

`QNGD`	Abstract class of quantum natural gradient descent.
`SR`	Stochastic reconfiguration (SR).
`SPRING`	SPRING optimizer.
`MARCH`	MARCH optimizer.
`ER`	Exact reconfiguration, performed by a full summation in the whole Hilbert space.
`MinSR_Structured`	MinSR optimization, specifically designed for `Sequential` networks.

`auto_pinv_eig`	Obtain the least-square minimum-norm solver for the linear equation \(Ax=b\) using pseudo-inverse.
`auto_shift_eig`