Using a sorting method may achieve better performance. (#54045)

paddle/phi/kernels/gpu/top_k_kernel.cu

@@ -102,7 +102,7 @@ void TopkKernel(const Context& dev_ctx,
 
     // The conclusion is drawn from the data through multiple sets of
     // statistics
-    if (input_width >= 128 && k >= input_width * 0.75) {
+    if (input_width >= 128 && k >= input_width * 0.25) {
       auto* ctx = reinterpret_cast<const phi::GPUContext*>(&dev_ctx);
       if (phi::funcs::SortTopk<T>(*ctx,
                                   input,