'Extract the coefficients and intercepts from packed_parameters.'

def _unpack(self, packed_parameters):

    for i in range((self.n_layers_ - 1)):
        (start, end, shape) = self._coef_indptr[i]
        self.coefs_[i] = np.reshape(packed_parameters[start:end], shape)
        (start, end) = self._intercept_indptr[i]
        self.intercepts_[i] = packed_parameters[start:end]
