Cache pip packages in GitHub actions.

.github/workflows/run-librispeech-2022-03-12.yml

@@ -22,19 +22,17 @@ on:
     branches:
       - master
   pull_request:
-    types: [labeled]
+    branches:
+      - master
 
 jobs:
   run_librispeech_2022_03_12:
-    if: github.event.label.name == 'ready' || github.event_name == 'push'
+    # if: github.event.label.name == 'ready' || github.event_name == 'push'
     runs-on: ${{ matrix.os }}
     strategy:
       matrix:
         os: [ubuntu-18.04]
         python-version: [3.7, 3.8, 3.9]
-        torch: ["1.10.0"]
-        torchaudio: ["0.10.0"]
-        k2-version: ["1.9.dev20211101"]
 
       fail-fast: false
 
@@ -43,29 +41,22 @@ jobs:
         with:
           fetch-depth: 0
 
+      - name: Install graphviz
+        shell: bash
+        run: |
+          sudo apt-get -qq install graphviz
+
       - name: Setup Python ${{ matrix.python-version }}
-        uses: actions/setup-python@v1
+        uses: actions/setup-python@v2
         with:
           python-version: ${{ matrix.python-version }}
+          cache: 'pip'
+          cache-dependency-path: '**/requirements-ci.txt'
 
       - name: Install Python dependencies
         run: |
-          python3 -m pip install --upgrade pip pytest
-          # numpy 1.20.x does not support python 3.6
-          pip install numpy==1.19
-          pip install torch==${{ matrix.torch }}+cpu torchaudio==${{ matrix.torchaudio }}+cpu -f https://download.pytorch.org/whl/cpu/torch_stable.html
-          pip install k2==${{ matrix.k2-version }}+cpu.torch${{ matrix.torch }} -f https://k2-fsa.org/nightly/
-
-          python3 -m pip install git+https://github.com/lhotse-speech/lhotse
-          python3 -m pip install kaldifeat
-          # We are in ./icefall and there is a file: requirements.txt in it
-          pip install -r requirements.txt
+          pip install -r ./requirements-ci.txt
 
-      - name: Install graphviz
-        shell: bash
-        run: |
-          python3 -m pip install -qq graphviz
-          sudo apt-get -qq install graphviz
 
       - name: Download pre-trained model
         shell: bash

requirements-ci.txt

@@ -0,0 +1,23 @@
+# dependencies for GitHub actions
+#
+# See https://github.com/actions/setup-python#caching-packages-dependencies
+
+# numpy 1.20.x does not support python 3.6
+numpy==1.19
+pytest==7.1.0
+graphviz==0.19.1
+
+-f https://download.pytorch.org/whl/cpu/torch_stable.html
+torch==1.10.0+cpu
+torchaudio==0.10.0+cpu
+
+-f https://k2-fsa.org/nightly/
+k2==1.9.dev20211101+cpu.torch1.10.0
+
+lhotse==0.12.0
+kaldifeat==1.12
+kaldilm==1.11
+kaldialign==0.2
+sentencepiece==0.1.96
+tensorboard==2.8.0
+typeguard==2.13.3