[CI] Skip Phi-MoE test due to old API util (#31632)

Signed-off-by: Andreas Karatzas <akaratza@amd.com>

.buildkite/test-amd.yaml

@@ -889,7 +889,7 @@ steps:
   commands:
     # Install fast path packages for testing against transformers
     # Note: also needed to run plamo2 model in vLLM
-    - uv pip install --system --no-build-isolation 'git+https://github.com/state-spaces/mamba@v2.2.5'
+    - uv pip install --system --no-build-isolation 'git+https://github.com/AndreasKaratzas/mamba@fix-rocm-7.0-warp-size-constexpr'
     - uv pip install --system --no-build-isolation 'git+https://github.com/Dao-AILab/causal-conv1d@v1.5.2'
     # Shard hybrid language model tests
     - pytest -v -s models/language/generation \
@@ -910,7 +910,7 @@ steps:
   commands:
     # Install fast path packages for testing against transformers
     # Note: also needed to run plamo2 model in vLLM
-    - uv pip install --system --no-build-isolation 'git+https://github.com/state-spaces/mamba@v2.2.5'
+    - uv pip install --system --no-build-isolation 'git+https://github.com/AndreasKaratzas/mamba@fix-rocm-7.0-warp-size-constexpr'
     - uv pip install --system --no-build-isolation 'git+https://github.com/Dao-AILab/causal-conv1d@v1.5.2'
     - pytest -v -s models/language/generation -m '(not core_model) and (not hybrid_model)'
 

tests/models/language/generation/test_phimoe.py

@@ -60,6 +60,19 @@ def test_phimoe_routing_function():
         assert torch.equal(topk_ids, ground_truth[test_id]["topk_ids"])
 
 
+# There is a known issue that triggers `AttributeError: 'DynamicCache'
+# object has no attribute 'seen_tokens'` when running:
+# `tests/models/language/generation/test_phimoe.py::test_models
+#   [5-64-bfloat16-microsoft/Phi-3.5-MoE-instruct]`
+# This issue is being investigated and tracked in:
+#   https://huggingface.co/microsoft/Phi-3.5-MoE-instruct/discussions/58
+# It is platform-agnostic. Therefore, we skip this test on all platforms for now.
+@pytest.mark.skip(
+    reason="Skipping due to known issue: "
+    "'DynamicCache' object has no attribute 'seen_tokens'. See: "
+    "https://huggingface.co/microsoft/Phi-3.5-MoE-instruct/discussions/58 "
+    "for details.",
+)
 @pytest.mark.skipif(
     condition=current_platform.is_cpu(),
     reason="This test takes a lot time to run on CPU, "