Add a CI runner with torchaudio absent

.github/workflows/unit_tests.yml

@@ -23,9 +23,11 @@ jobs:
           - python-version: "3.9"
             torch-install-cmd: "pip install torch==1.8.2+cpu torchaudio==0.8.2 -f https://download.pytorch.org/whl/lts/1.8/torch_lts.html"
           - python-version: "3.10"
-            torch-install-cmd: "pip install torch==1.12.1 torchaudio==0.12.1 torchdata==0.4.1 --extra-index-url https://download.pytorch.org/whl/cpu"
+            torch-install-cmd: "pip install torch==1.12.1 torchaudio==0.12.1 --extra-index-url https://download.pytorch.org/whl/cpu"
           - python-version: "3.11"
-            torch-install-cmd: "pip install torch==2.0 torchaudio==2.0 torchdata==0.6 --extra-index-url https://download.pytorch.org/whl/cpu"
+            torch-install-cmd: "pip install torch==2.0 torchaudio==2.0 --extra-index-url https://download.pytorch.org/whl/cpu"
+          - python-version: "3.11"
+            torch-install-cmd: "pip install torch==2.0 --extra-index-url https://download.pytorch.org/whl/cpu"
 
       fail-fast: false
 
@@ -49,7 +51,8 @@ jobs:
         pip install wheel numpy
         # Force the installation of a CPU-only PyTorch
         ${{ matrix.torch-install-cmd }}
-        pip install '.[tests]'
+        # the torchaudio env var does nothing when torchaudio is installed, but doesn't require it's presence when it's not
+        LHOTSE_REQUIRE_TORCHAUDIO=0 pip install '.[tests]'
         # Enable some optional tests
         pip install h5py dill smart_open[http] kaldifeat kaldi_native_io webdataset==0.2.5 s3prl scipy nara_wpe pyloudnorm
     - name: Install sph2pipe

setup.py

@@ -58,7 +58,7 @@
 )  # False = public release, True = otherwise
 
 
-LHOTSE_USE_TORCHAUDIO = os.environ.get("LHOTSE_USE_TORCHAUDIO", "1") in (
+LHOTSE_REQUIRE_TORCHAUDIO = os.environ.get("LHOTSE_REQUIRE_TORCHAUDIO", "1") in (
     "1",
     "True",
     "true",
@@ -173,7 +173,7 @@ def mark_lhotse_version(version: str) -> None:
     # Otherwise, we'll just install the latest versions from PyPI for the user.
     import torch
 
-    if LHOTSE_USE_TORCHAUDIO:
+    if LHOTSE_REQUIRE_TORCHAUDIO:
         try:
             import torchaudio
         except ImportError:
@@ -188,7 +188,7 @@ def mark_lhotse_version(version: str) -> None:
             )
 except ImportError:
     extras = ["torch"]
-    if LHOTSE_USE_TORCHAUDIO:
+    if LHOTSE_REQUIRE_TORCHAUDIO:
         extras.append("torchaudio")
     install_requires.extend(extras)