From b575fb1d02f7a98c94a576284fbcd4ff85970120 Mon Sep 17 00:00:00 2001
From: Benoit Steiner <benoit.steiner.goog@gmail.com>
Date: Thu, 31 Mar 2016 10:43:59 -0700
Subject: [PATCH] Added NumTraits for half floats

---
 Eigen/src/Core/arch/CUDA/Half.h | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/Eigen/src/Core/arch/CUDA/Half.h b/Eigen/src/Core/arch/CUDA/Half.h
index ace250c6f..dc7119c06 100644
--- a/Eigen/src/Core/arch/CUDA/Half.h
+++ b/Eigen/src/Core/arch/CUDA/Half.h
@@ -341,6 +341,18 @@ template<> struct is_arithmetic<half> { enum { value = true }; };
 
 } // end namespace internal
 
+template<> struct NumTraits<Eigen::half>
+    : GenericNumTraits<Eigen::half>
+{
+  EIGEN_DEVICE_FUNC static inline float dummy_precision() { return 1e-3f; }
+  EIGEN_DEVICE_FUNC static inline Eigen::half highest() {
+    return internal::raw_uint16_to_half(0x7bff);
+  }
+  EIGEN_DEVICE_FUNC static inline Eigen::half lowest() {
+    return internal::raw_uint16_to_half(0xfbff);
+  }
+};
+
 // Infinity/NaN checks.
 
 namespace numext {