[Bugfix] add a patch to fix T.abs on float16 (#325)

* [bug] fix T.abs on float16

* [lint] lint

src/tl_templates/cuda/common.h

@@ -23,6 +23,13 @@ using int4_t = int4;
 
 #define TL_DEVICE __forceinline__ __device__
 #define TL_DEVICE_NOINLINE __noinline__ __device__
+#define TL_PATCH
+
+// abs function for bfloat_t and half_t since there is no implicit convertion
+// method
+TL_PATCH TL_DEVICE half_t __habs(const half_t x) {
+  return half_t(__habs(x.to_half()));
+}
 
 // Pack two half values.
 TL_DEVICE unsigned __pack_half2(const half x, const half y) {