Adding Test for CadenceWith16BitMatmulActivationsQuantizer

backends/cadence/aot/TARGETS

@@ -641,6 +641,9 @@ python_unittest(
     typing = True,
     deps = [
         "//caffe2:torch",
+        "//executorch/backends/cadence/aot:graph_builder",
         "//executorch/backends/cadence/aot/quantizer:quantizer",
+        "//executorch/exir:pass_base",
+        "//pytorch/ao:torchao",
     ],
 )

backends/cadence/aot/tests/test_quantizer_ops.py

@@ -9,14 +9,64 @@
 import unittest
 
 import torch
+from executorch.backends.cadence.aot.graph_builder import GraphBuilder
 from executorch.backends.cadence.aot.quantizer.patterns import AddmmPattern
+from executorch.exir.pass_base import NodeMetadata
 
 from executorch.backends.cadence.aot.quantizer.quantizer import (
     CadenceAtenQuantizer,
     CadenceDefaultQuantizer,
     CadenceW8A32MixedQuantizer,
+    CadenceWith16BitMatmulActivationsQuantizer,
+    qconfig_A16,
     qconfig_A8W8,
 )
+from torchao.quantization.pt2e.quantizer.quantizer import (
+    Q_ANNOTATION_KEY,
+    QuantizationAnnotation,
+)
+
+
+class QuantizerAnnotationTest(unittest.TestCase):
+    """Unit tests for verifying quantizer annotations are correctly applied."""
+
+    def _build_matmul_graph(self) -> tuple[torch.fx.GraphModule, torch.fx.Node]:
+        """Build a simple graph with a matmul operation."""
+        builder = GraphBuilder()
+        x = builder.placeholder("x", torch.randn(4, 8))
+        y = builder.placeholder("y", torch.randn(8, 4))
+        matmul = builder.call_operator(
+            op=torch.ops.aten.matmul.default,
+            args=(x, y),
+            meta=NodeMetadata(
+                {"source_fn_stack": [("matmul", torch.ops.aten.matmul.default)]}
+            ),
+        )
+        builder.output([matmul])
+        gm = builder.get_graph_module()
+
+        matmul_nodes = gm.graph.find_nodes(
+            op="call_function",
+            target=torch.ops.aten.matmul.default,
+        )
+        self.assertEqual(len(matmul_nodes), 1, "Should find exactly one matmul node")
+        return gm, matmul_nodes[0]
+
+    def test_matmul_16bit_quantizer_annotation(self) -> None:
+        """Test that CadenceWith16BitMatmulActivationsQuantizer correctly annotates matmul."""
+        gm, matmul_node = self._build_matmul_graph()
+
+        quantizer = CadenceWith16BitMatmulActivationsQuantizer()
+        quantizer.annotate(gm)
+
+        annotation: QuantizationAnnotation = matmul_node.meta[Q_ANNOTATION_KEY]
+        self.assertTrue(annotation._annotated)
+
+        self.assertEqual(annotation.output_qspec, qconfig_A16.output_activation)
+
+        self.assertEqual(len(annotation.input_qspec_map), 2)
+        for _, input_qspec in annotation.input_qspec_map.items():
+            self.assertEqual(input_qspec, qconfig_A16.input_activation)
 
 
 class QuantizerOpsPreserveTest(unittest.TestCase):