[CI/Build] Add is_quant_method_supported to control quantization test configurations (#5253)

tests/quantization/utils.py

@@ -0,0 +1,14 @@
+import torch
+
+from vllm.model_executor.layers.quantization import QUANTIZATION_METHODS
+
+
+def is_quant_method_supported(quant_method: str) -> bool:
+    # Currently, all quantization methods require Nvidia or AMD GPUs
+    if not torch.cuda.is_available():
+        return False
+
+    capability = torch.cuda.get_device_capability()
+    capability = capability[0] * 10 + capability[1]
+    return (capability <
+            QUANTIZATION_METHODS[quant_method].get_min_capability())