Del un mgpu @ deeplearning/projects/flashlight/flashlight/pkg/speech/…

…third_party/warpctc/include/detail/gpu_ctc_kernels.h:8

Summary:
Removes a `using namespace` from the global namespace in pursuit of enabling `-Wheader-hygiene`.
Qualifies instances that relied on the `using namespace`.

#buildmore - Be thorough

#buildsonlynotests - If it builds, it works

 - If you approve of this diff, please use the "Accept & Ship" button

Reviewed By: palmje, meyering

Differential Revision: D59157511

fbshipit-source-id: 0e688d1c4bfddac986117df580614839fa6f58a0

flashlight/pkg/speech/third_party/warpctc/include/detail/gpu_ctc_kernels.h

@@ -5,7 +5,6 @@
 
 #include "ctc_helper.h"
 
-using namespace mgpu;
 
 template<int NT, int VT, typename T, typename KeyT, typename Op>
 struct CTASegReduce {
@@ -485,4 +484,4 @@ __global__ void prepare_stable_SM_kernel(Op f, ProbT* probs,
         }
         idx += stride;
     }
-}
+}