from .module import Module
from .container import Container


class CrossMapLRN2d(Module):
    def __init__(self, size, alpha=1e-4, beta=0.75, k=1):
        super(CrossMapLRN2d, self).__init__()
        self.size = size
        self.alpha = alpha
        self.beta = beta
        self.k = k

    def forward(self, input):
        return self._backend.CrossMapLRN2d(self.size, self.alpha, self.beta,
                                           self.k)(input)

    def __repr__(self):
        return self.__class__.__name__ + ' (' \
            + ', alpha=' + str(self.alpha) \
            + ', beta=' + str(self.beta) \
            + ', k=' + str(self.k) \
            + ')'


# TODO: ContrastiveNorm2d
# TODO: DivisiveNorm2d
# TODO: SubtractiveNorm2d