Remove FX backward test from GitHub actions runs for now.

tests/test_models.py

@@ -386,6 +386,9 @@ def test_model_forward_fx(model_name, batch_size):
     assert not torch.isnan(outputs).any(), 'Output included NaNs'
 
 
+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))
@@ -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',