fix format (#567)

colossalai/kernel/cuda_native/csrc/kernels/include/softmax.h

@@ -10,9 +10,8 @@
 
 using namespace std;
 
-template <typename T>
-class Softmax {
- public:
+template <typename T> class Softmax {
+public:
   struct Config {
     size_t nhead;
     Config(size_t nhead) : nhead(nhead) {}
@@ -35,10 +34,8 @@ class Softmax {
                               stream);
   }
 
-  void reset_size(size_t nhead) {
-    config_.nhead = nhead;
-  }
+  void reset_size(size_t nhead) { config_.nhead = nhead; }
 
- private:
+private:
   Config config_;
 };