Update pytorch

relaxed constraints on both pytorch and torchvision:

• pytorch >= 0.4.0 (instead of ==)
• torchvision >= 0.2.0 (instead of ==)

Updated the CI (dropping out Python 2)

.gitlab-ci.yml

@@ -48,10 +48,18 @@ stages:
     key: "linux-cache"
 
 
-build_linux_27:
-  <<: *linux_build_job
-  variables:
-    PYTHON_VERSION: "2.7"
+.build_macosx_template: &macosx_build_job
+  <<: *build_job
+  tags:
+    - macosx
+  artifacts:
+    expire_in: 1 week
+    paths:
+      - _ci/
+      - ${CONDA_ROOT}/conda-bld/osx-64/*.tar.bz2
+  cache:
+    <<: *build_caches
+    key: "macosx-cache"
 
 
 build_linux_36:
@@ -68,6 +76,12 @@ build_linux_36:
       - ${CONDA_ROOT}/conda-bld/linux-64/*.tar.bz2
 
 
+build_macosx_36:
+  <<: *macosx_build_job
+  variables:
+    PYTHON_VERSION: "3.6"
+
+
 # Deploy targets
 .deploy_template: &deploy_job
   stage: deploy
@@ -76,8 +90,8 @@ build_linux_36:
   script:
     - ./_ci/deploy.sh
   dependencies:
-    - build_linux_27
     - build_linux_36
+    - build_macosx_36
   tags:
     - deployer