cntk: 2.4 -> 2.7

Restrict platforms to x86_64-linux.

pkgs/applications/science/math/cntk/default.nix

@@ -18,17 +18,15 @@ let
 
 in stdenv.mkDerivation rec {
   name = "CNTK-${version}";
-  version = "2.4";
+  version = "2.7";
 
   # Submodules
   src = fetchgit {
     url = "https://github.com/Microsoft/CNTK";
     rev = "v${version}";
-    sha256 = "0m28wb0ljixcpi14g3gcfiraimh487yxqhd9yrglgyvjb69x597y";
+    sha256 = "18l9k7s966a26ywcf7flqyhm61788pcb9fj3wk61jrmgkhy2pcns";
   };
 
-  patches = [ ./fix_std_bind.patch ];
-
   nativeBuildInputs = [ cmake ];
 
   buildInputs = [ openblas opencv3 libzip boost protobuf openmpi ]
@@ -87,6 +85,7 @@ in stdenv.mkDerivation rec {
     homepage = https://github.com/Microsoft/CNTK;
     description = "An open source deep-learning toolkit";
     license = if onebitSGDSupport then licenses.unfreeRedistributable else licenses.mit;
+    platforms = [ "x86_64-linux" ];
     maintainers = with maintainers; [ abbradar ];
   };
 }

pkgs/applications/science/math/cntk/fix_std_bind.patch

@@ -1,11 +0,0 @@
-diff -ru3 CNTK-old/Source/CNTKv2LibraryDll/EvaluatorWrapper.h CNTK-new/Source/CNTKv2LibraryDll/EvaluatorWrapper.h
---- CNTK-old/Source/CNTKv2LibraryDll/EvaluatorWrapper.h	1970-01-01 03:00:01.000000000 +0300
-+++ CNTK-new/Source/CNTKv2LibraryDll/EvaluatorWrapper.h	2018-02-25 18:16:16.330269647 +0300
-@@ -9,6 +9,7 @@
- #include <boost/noncopyable.hpp>
- #include <memory>
- #include <vector>
-+#include <functional>
- 
- #include "CNTKLibrary.h"
- #include "CNTKLibraryC.h"

pkgs/development/python-modules/cntk/default.nix

@@ -1,32 +1,49 @@
 { stdenv
+, lib
 , buildPythonPackage
 , pkgs
 , numpy
 , scipy
+, openmpi
 , enum34
 , protobuf
 , pip
 , python
+, swig
 }:
 
+let
+  cntk = pkgs.cntk;
+in
 buildPythonPackage rec {
-  inherit (pkgs.cntk) name version src;
+  inherit (cntk) name version src;
 
-  nativeBuildInputs = [ pkgs.swig pkgs.openmpi ];
+  nativeBuildInputs = [ swig openmpi ];
-  buildInputs = [ pkgs.cntk pkgs.openmpi ];
+  buildInputs = [ cntk openmpi ];
   propagatedBuildInputs = [ numpy scipy enum34 protobuf pip ];
 
-  CNTK_LIB_PATH = "${pkgs.cntk}/lib";
+  CNTK_LIB_PATH = "${cntk}/lib";
-  CNTK_COMPONENT_VERSION = pkgs.cntk.version;
+  CNTK_COMPONENT_VERSION = cntk.version;
+  CNTK_VERSION = cntk.version;
+  CNTK_VERSION_BANNER = cntk.version;
 
   postPatch = ''
     cd bindings/python
-    sed -i 's,"libmpi.so.12","${pkgs.openmpi}/lib/libmpi.so",g' cntk/train/distributed.py
+    sed -i 's,"libmpi.so.12","${openmpi}/lib/libmpi.so",g' cntk/train/distributed.py
+
+    # Remove distro and libs checks; they aren't compatible with NixOS and besides we guarantee
+    # compatibility by providing a package.
+    cat <<EOF > cntk/cntk_py_init.py
+    def cntk_check_distro_info():
+      pass
+    def cntk_check_libs():
+      pass
+    EOF
   '';
 
   postInstall = ''
     rm -rf $out/${python.sitePackages}/cntk/libs
-    ln -s ${pkgs.cntk}/lib $out/${python.sitePackages}/cntk/libs
+    ln -s ${cntk}/lib $out/${python.sitePackages}/cntk/libs
     # It's not installed for some reason.
     cp cntk/cntk_py.py $out/${python.sitePackages}/cntk
   '';
@@ -38,10 +55,8 @@ buildPythonPackage rec {
   '';
 
   meta = {
-    inherit (pkgs.cntk.meta) homepage description license maintainers;
+    inherit (cntk.meta) homepage description license maintainers platforms;
-    # broken in CNTK 2.4 starting with python-3.7
+    # doesn't support Python 3.7
-    # ("ImportError: cannot import name 'GenericMeta' from 'typing'")
+    broken = lib.versionAtLeast python.version "3.7";
-    broken = stdenv.lib.versionAtLeast python.version "3.7";
-
   };
 }