keskarnitish

from collections import OrderedDict
import numpy as np
import theano
import theano.tensor as T
from theano.ifelse import ifelse


def cg(loss, params, x0=None, max_iters=100, precondition=None, tol=1e-3,
       conv_crit='cg'):
    """(Preconditioned) Conjugate Gradient (CG) updates