* 色々試してみている
** タイムステップとの関係は大丈夫か?
*** challenges = {
  :filter => [:wfr],
  :pos_sigma => [1e-0],
  :input_fetch => [:modal_with_noise],
}の結果
WFR(:wfr_cascade => 12, :deltaT => 5E-3){
{-1.78214,-4.07642,1.62243},
{0.999991,-3.13808e-007,2.2738e-006}
}
WFR(:wfr_cascade => 11, :deltaT => 5E-2){
{-0.533534,-3.18474,0.536492},
{0.999829,3.37221e-005,4.18603e-005}
}
WFR(:wfr_cascade => 10, :deltaT => 1E-2){
{-1.05564,-3.35996,1.03806},
{0.99998,3.5174e-007,4.89242e-006}
}