Cache dependencies

.github/workflows/tests.yml

@@ -9,7 +9,12 @@ on:
 jobs:
   build:
 
-    runs-on: ubuntu-latest
+    runs-on: ${{ matrix.os }} 
+    strategy:
+      matrix:
+        os: [ubuntu-latest, maxos-latest]
+        python-version: 3.11
+        pytorch-version: 1.12.0
 
     steps:
     - name: Checkout
@@ -18,7 +23,20 @@ jobs:
       uses: actions/setup-python@v2
       with:
         python-version: 3.11
-        cache: 'pip'
+
+    - name: Get pip cache dir
+      id: pip-cache
+      run: |
+        echo "::set-output name=dir::$(pip cache dir)"
+
+    - name: Cache dependencies
+      uses: actions/cache@v3
+      with:
+        path: ${{ steps.pip-cache.outputs.dir }}
+        key: ${{ matrix.os }}-py${{ matrix.python-version }}-pt${{ matrix.pytorch-version }}-pip-${{ hashFiles('**/requirements.txt') }}
+        restore-keys: |
+          ${{ matrix.os }}-py${{ matrix.python-version }}-pt${{ matrix.pytorch-version }}-pip-
+
     - name: Install dependencies
       run: |
         python -m pip install --upgrade pip