fix CMAKE

paddle/fluid/train/CMakeLists.txt

@@ -25,4 +25,6 @@ function(train_test TARGET_NAME)
 endfunction(train_test)
 
 
-train_test(recognize_digits ARGS mlp conv)
+if(WITH_TESTING)
+  train_test(recognize_digits ARGS mlp conv)
+endif()

paddle/fluid/train/test_train_recognize_digits.cc

@@ -52,8 +52,6 @@ void Train() {
 
   PADDLE_ENFORCE_NE(loss_name, "", "loss not found");
 
-  // init all parameters
-
   // prepare data
   auto x_var = scope.Var("img");
   auto x_tensor = x_var->GetMutable<framework::LoDTensor>();