message: change the formular of BinaryCrossEntropyLoss bprop
diff: @@ -201,7 +201,8 @@ __global__ void BinaryCrossEntropy_Kernel(float *input, const float *label, floa
  // grad
  if(x > MIN_X && val < 1.0f - MIN_ && val > MIN_){
  - input[i] = -1.0f * val * (y - val) * exp_neg_x / (1.0f - val) / batch_size * scaler;
  + //input[i] = -1.0f * val * (y - val) * exp_neg_x / (1.0f - val) / batch_size * scaler;
  + input[i] = (-y * (1.0f - val) + val * (1.0f - y)) / batch_size * scaler;
  }
  else{
  input[i] = 0.f;
  