Remove FX backward test from GitHub actions runs for now.

tests/test_models.py

@@ -386,11 +386,14 @@ def test_model_forward_fx(model_name, batch_size):
     assert not torch.isnan(outputs).any(), 'Output included NaNs'
 
 
-@pytest.mark.timeout(120)
-@pytest.mark.parametrize('model_name', list_models(
+if 'GITHUB_ACTIONS' not in os.environ:
+    # FIXME this test is causing GitHub actions to run out of RAM and abruptly kill the test process
+
+    @pytest.mark.timeout(120)
+    @pytest.mark.parametrize('model_name', list_models(
         exclude_filters=EXCLUDE_FILTERS + EXCLUDE_FX_FILTERS, name_matches_cfg=True))
-@pytest.mark.parametrize('batch_size', [2])
-def test_model_backward_fx(model_name, batch_size):
+    @pytest.mark.parametrize('batch_size', [2])
+    def test_model_backward_fx(model_name, batch_size):
         """Symbolically trace each model and run single backward pass through the resulting GraphModule"""
         if not has_fx_feature_extraction:
             pytest.skip("Can't test FX. Torch >= 1.10 and Torchvision >= 0.11 are required.")
@@ -418,6 +421,7 @@ def test_model_backward_fx(model_name, batch_size):
         assert num_params == num_grad, 'Some parameters are missing gradients'
         assert not torch.isnan(outputs).any(), 'Output included NaNs'
 
+
 # reason: model is scripted after fx tracing, but beit has torch.jit.is_scripting() control flow
 EXCLUDE_FX_JIT_FILTERS = [
     'deit_*_distilled_patch16_224',