restore lrn fix error

src/operators/kernel/arm/lrn_kernel.cpp

@@ -23,15 +23,10 @@ namespace operators {
 
 template <>
 void LrnKernel<CPU, float>::Compute(const LrnParam &param) const {
-  const float alpha = param.Alpha();
   const Tensor *input_x = param.InputX();
   auto x_dims = input_x->dims();
   Tensor *out = param.Out();
   out->mutable_data<float>();
-  if (alpha < 0.001) {
-    // coarse precision
-    out->ShareDataWith(*input_x);
-  } else {
   /// data_format = NCHW
   const int N = x_dims[0];
   const int C = x_dims[1];
@@ -39,11 +34,11 @@ void LrnKernel<CPU, float>::Compute(const LrnParam &param) const {
   const int W = x_dims[3];
 
   const int n = param.N();
+  const float alpha = param.Alpha();
   const float beta = param.Beta();
   const float k = param.K();
   LRNFunctor<float> lrnFunctor;
   lrnFunctor(*input_x, out, N, C, H, W, n, k, alpha, beta);
-  }
 }
 
 template class LrnKernel<CPU, float>;