update PyTorch 1.4 easyconfigs to use custom easyblock (and do less downloading during installations)

easybuild/easyconfigs/p/PyTorch/PyTorch-1.4.0_fix-missing-source-dir.patch

@@ -0,0 +1,30 @@
+From 2720d63c0cb11cdd96523e3ac22a6d54811ef661 Mon Sep 17 00:00:00 2001
+From: Alexander Grund <alexander.grund@tu-dresden.de>
+Date: Fri, 10 Jul 2020 09:57:00 +0200
+Subject: [PATCH] Define PSIMD_SOURCE_DIR when including FP16
+
+Avoids a superflous redownload when *NNPACK is not used (e.g. on Power)
+---
+ cmake/Dependencies.cmake | 7 ++++++-
+ 1 file changed, 6 insertions(+), 1 deletion(-)
+
+diff --git a/cmake/Dependencies.cmake b/cmake/Dependencies.cmake
+index d6ffc50660675..6fb5a91338718 100644
+--- a/cmake/Dependencies.cmake
++++ b/cmake/Dependencies.cmake
+@@ -673,8 +673,13 @@ endif()
+
+ # ---[ Caffe2 depends on FP16 library for half-precision conversions
+ if (NOT TARGET fp16)
+-  if (NOT DEFINED FP16_SOURCE_DIR)
+-    set(FP16_SOURCE_DIR "${CMAKE_CURRENT_LIST_DIR}/../third_party/FP16" CACHE STRING "FP16 source directory")
++  set(CAFFE2_THIRD_PARTY_ROOT "${PROJECT_SOURCE_DIR}/third_party")
++  # PSIMD is required by FP16
++  if(NOT DEFINED PSIMD_SOURCE_DIR)
++    set(PSIMD_SOURCE_DIR "${CAFFE2_THIRD_PARTY_ROOT}/psimd" CACHE STRING "PSimd source directory")
++  endif()
++  if(NOT DEFINED FP16_SOURCE_DIR)
++    set(FP16_SOURCE_DIR "${CAFFE2_THIRD_PARTY_ROOT}/FP16" CACHE STRING "FP16 source directory")
+   endif()
+
+   set(FP16_BUILD_TESTS OFF CACHE BOOL "")

easybuild/easyconfigs/p/PyTorch/PyTorch-1.4.0_fix-system-pybind11.patch

@@ -0,0 +1,23 @@
+From 4a48ba57e0cab63d357faf7adf93cf61106221f0 Mon Sep 17 00:00:00 2001
+From: Alexander Grund <alexander.grund@tu-dresden.de>
+Date: Mon, 7 Sep 2020 12:40:56 +0200
+Subject: [PATCH] Remove pybind11 from required submodules
+
+This can be taken from the system in which case it is not used from the
+submodule. Hence the check here limits the usage unneccessarily
+---
+ setup.py | 1 -
+ 1 file changed, 1 deletion(-)
+
+diff --git a/setup.py b/setup.py
+index 8c060a1c5e3f3..c91916ab1b1e8 100644
+--- a/setup.py
++++ b/setup.py
+@@ -309,7 +309,6 @@ def check_file(f):
+             sys.exit(1)
+
+     check_file(os.path.join(third_party_path, "gloo", "CMakeLists.txt"))
+-    check_file(os.path.join(third_party_path, "pybind11", "CMakeLists.txt"))
+     check_file(os.path.join(third_party_path, 'cpuinfo', 'CMakeLists.txt'))
+     check_file(os.path.join(third_party_path, 'tbb', 'Makefile'))
+     check_file(os.path.join(third_party_path, 'onnx', 'CMakeLists.txt'))