CI for notebooks (#174)

* Update example notebooks to write under examples/data/

* Update example notebooks for TileDB-Cloud

* Run notebook examples on CI Github action

* Set num_workers based on available #cores in example notebooks

.github/workflows/ci.yml

@@ -6,9 +6,6 @@ jobs:
   build:
     runs-on: ubuntu-latest
     timeout-minutes: 30
-    defaults:
-      run:
-        shell: bash -l {0}
     strategy:
       fail-fast: false
       matrix:
@@ -48,6 +45,16 @@ jobs:
         mypyenv/bin/mypy .
         rm -rf mypyenv
 
+    - name: Run notebook examples
+      if: ${{ github.ref == 'refs/heads/master' }}
+      run: |
+        pip install pytest-xdist nbmake matplotlib torchvision idx2numpy
+        pytest --disable-warnings --nbmake examples/{models,readers}
+        # Run tiledb-cloud in parallel
+        if [[ "${{ secrets.TILEDB_API_TOKEN }}" != "" ]]; then
+          TILEDB_API_TOKEN="${{ secrets.TILEDB_API_TOKEN }}" pytest --disable-warnings --nbmake -n3 examples/cloud
+        fi
+
     - name: Run tests
       if: ${{ !fromJSON(env.run_coverage) }}
       run: pytest --disable-warnings tests/