Enable the vectorization of adds and mult on fp16s. This improves the

performance of the toy mnist training by 1 order of magnitude
Change: 124374286

eigen.BUILD

 package(default_visibility = ["//visibility:public"])
 
-archive_dir = "eigen-eigen-62a2305d5734"
+archive_dir = "eigen-eigen-5f86b31739cd"
 
 cc_library(
     name = "eigen",

tensorflow/contrib/cmake/external/eigen.cmake

@@ -7,7 +7,7 @@
 
 include (ExternalProject)
 
-set(eigen_archive_hash "62a2305d5734")
+set(eigen_archive_hash "5f86b31739cd")
 
 set(eigen_INCLUDE_DIRS
     ${CMAKE_CURRENT_BINARY_DIR}
@@ -16,7 +16,7 @@ set(eigen_INCLUDE_DIRS
     ${tensorflow_source_dir}/third_party/eigen3
 )
 set(eigen_URL https://bitbucket.org/eigen/eigen/get/${eigen_archive_hash}.tar.gz)
-set(eigen_HASH SHA256=d5da5c60f7225bc2f104f3494323b929e68e3a188ccf01dcee61df32ff536888)
+set(eigen_HASH SHA256=e1101422f198a5d8c07e008eb801aeac385bf3022d88a0f041acc9f77e09d26e)
 set(eigen_BUILD ${CMAKE_CURRENT_BINARY_DIR}/eigen/src/eigen)
 set(eigen_INSTALL ${CMAKE_CURRENT_BINARY_DIR}/eigen/install)
 

tensorflow/workspace.bzl

@@ -6,8 +6,8 @@
 def tf_workspace(path_prefix = "", tf_repo_name = ""):
   native.new_http_archive(
     name = "eigen_archive",
-    url = "https://bitbucket.org/eigen/eigen/get/62a2305d5734.tar.gz",
-    sha256 = "d5da5c60f7225bc2f104f3494323b929e68e3a188ccf01dcee61df32ff536888",
+    url = "https://bitbucket.org/eigen/eigen/get/5f86b31739cd.tar.gz",
+    sha256 = "e1101422f198a5d8c07e008eb801aeac385bf3022d88a0f041acc9f77e09d26e",
     build_file = path_prefix + "eigen.BUILD",
   )
 

third_party/eigen3/Eigen/Cholesky

-#include "eigen-eigen-62a2305d5734/Eigen/Cholesky"
+#include "eigen-eigen-5f86b31739cd/Eigen/Cholesky"

third_party/eigen3/Eigen/Core

-#include "eigen-eigen-62a2305d5734/Eigen/Core"
+#include "eigen-eigen-5f86b31739cd/Eigen/Core"

third_party/eigen3/Eigen/Eigenvalues

-#include "eigen-eigen-62a2305d5734/Eigen/Eigenvalues"
+#include "eigen-eigen-5f86b31739cd/Eigen/Eigenvalues"

third_party/eigen3/Eigen/LU

-#include "eigen-eigen-62a2305d5734/Eigen/LU"
+#include "eigen-eigen-5f86b31739cd/Eigen/LU"

third_party/eigen3/Eigen/QR

-#include "eigen-eigen-62a2305d5734/Eigen/QR"
+#include "eigen-eigen-5f86b31739cd/Eigen/QR"

third_party/eigen3/unsupported/Eigen/CXX11/Tensor

-#include "eigen-eigen-62a2305d5734/unsupported/Eigen/CXX11/Tensor"
+#include "eigen-eigen-5f86b31739cd/unsupported/Eigen/CXX11/Tensor"