Use fabsf for a floating point number instead of ::abs which is

iotamudelta · iotamudelta · commit 0dfbc70a9005 · 2018-09-07T14:11:45.000-05:00
integer-only on ROCm.

Still not ideal, but we do not have an intrinsic habs(__half)
diff --git a/aten/src/THC/THCNumerics.cuh b/aten/src/THC/THCNumerics.cuh
@@ -309,7 +309,11 @@ struct THCNumerics<half> {
   }
 
   static inline __host__ __device__ half abs(half a) {
+#if defined(__HIP_PLATFORM_HCC__)
+    return static_cast<at::Half>(fabsf(static_cast<at::Half>(a)));
+#else
     return static_cast<at::Half>(::abs(static_cast<at::Half>(a)));
+#endif
   }
 
   static inline __host__ __device__ half round(half a) {

Original file line number	Diff line number	Diff line change
`@@ -309,7 +309,11 @@ struct THCNumerics<half> {`
`309`	`309`	`}`
`310`	`310`
`311`	`311`	`static inline __host__ __device__ half abs(half a) {`
	`312`	`+#if defined(__HIP_PLATFORM_HCC__)`
	`313`	`+ return static_cast<at::Half>(fabsf(static_cast<at::Half>(a)));`
	`314`	`+#else`
`312`	`315`	`return static_cast<at::Half>(::abs(static_cast<at::Half>(a)));`
	`316`	`+#endif`
`313`	`317`	`}`
`314`	`318`
`315`	`319`	`static inline __host__ __device__ half round(half a) {`