Add numpy dev wheel to travis build matrix.

Author: amueller

.travis.yml

@@ -12,13 +12,15 @@ cache:
   - $HOME/sklearn_build_ubuntu
   - $HOME/sklearn_build_oldest
   - $HOME/sklearn_build_latest
+  - $HOME/sklearn_build_numpy_dev
   - $HOME/.cache/pip
   - $HOME/download
 addons:
   apt:
     packages:
       - libatlas3gf-base
       - libatlas-dev
+      # only required by the DISTRIB="ubuntu" build:
       - python-scipy
 
 env:
@@ -41,6 +43,22 @@ env:
       NUMPY_VERSION="1.10.2" SCIPY_VERSION="0.16.1" CYTHON_VERSION="0.23.4"
       CACHED_BUILD_DIR="$HOME/sklearn_build_latest"
 
+matrix:
+  include:
+    # This environment tests scikit-learn against numpy and scipy master
+    # installed from their CI wheels in a virtualenv with the Python
+    # interpreter provided by travis.
+    # Note: libatlas3gf-base is not allowed yet so we need 'sudo':
+    # https://github.com/travis-ci/apt-package-whitelist/issues/2407
+    # Once libatlas3gf-base is on the whitelist it will be possible to replace
+    # the before_install step with and addons/apt/packages declaration.
+    -  python: 3.5
+       env: DISTRIB="scipy-dev-wheels"
+            CACHED_BUILD_DIR="$HOME/sklearn_build_numpy_dev"
+       sudo: True
+       before_install: sudo apt-get install -yqq libatlas3gf-base libatlas-dev
+
+
 install: source continuous_integration/install.sh
 script: bash continuous_integration/test_script.sh
 after_success: source continuous_integration/after_success.sh

continuous_integration/install.sh

@@ -22,8 +22,6 @@ export CXX=g++
 echo 'List files from cached directories'
 echo 'pip:'
 ls $HOME/.cache/pip
-echo 'download'
-ls $HOME/download
 
 
 if [[ "$DISTRIB" == "conda" ]]; then
@@ -78,8 +76,23 @@ elif [[ "$DISTRIB" == "ubuntu" ]]; then
     # Create a new virtualenv using system site packages for numpy and scipy
     virtualenv --system-site-packages testvenv
     source testvenv/bin/activate
-    pip install nose nose-timer
-    pip install cython
+    pip install nose nose-timer cython
+
+elif [[ "$DISTRIB" == "scipy-dev-wheels" ]]; then
+    # Set up our own virtualenv environment to avoid travis' numpy
+    virtualenv --python=python ~/venv
+    source ~/venv/bin/activate
+    pip install --upgrade pip setuptools
+
+    # We use the default Python virtualenv provided by travis
+    echo "Installing numpy master wheel"
+    pip install --pre --upgrade --no-index --timeout=60 \
+        --trusted-host travis-dev-wheels.scipy.org \
+        -f https://travis-dev-wheels.scipy.org/ numpy scipy
+    pip install nose nose-timer cython
+
+    # Install nose-timer via pip
+    pip install nose-timer
 fi
 
 if [[ "$COVERAGE" == "true" ]]; then