Fix XNNPACK Example for MV3 (#147)

Summary:
Pull Request resolved: #147

xnnpack requires dequant nodes to be duplicated such that len(dq.users) == 1. We run this pass on our internal XNNPACK tests

From Jerry: This will be a config that is used within the XNNPACKQuantizer. This will be added later, for the sake of enabling this in the example, we add the duplicatedequantnodepass to our edge compile config

Additionally, graph_validation is failing for MV3, so we have to disable_validation for now. cccclai is looking into it

Reviewed By: digantdesai

Differential Revision: D48703639

fbshipit-source-id: 4521243d120b401da47d048a10e1363b444b2cbb

Author: mcr229

examples/backend/xnnpack_examples.py

@@ -15,6 +15,9 @@
     XnnpackQuantizedPartitioner2,
 )
 from executorch.exir.backend.backend_api import to_backend
+from executorch.exir.backend.canonical_partitioners.duplicate_dequant_node_pass import (
+    DuplicateDequantNodePass,
+)
 
 from ..models import MODEL_NAME_TO_MODEL
 from ..quantization.utils import quantize
@@ -78,7 +81,13 @@
     # It will eventually be changed to a lifted graph, in which _unlift=False,
     edge = exir.capture(
         model, example_inputs, exir.CaptureConfig(enable_aot=True, _unlift=True)
-    ).to_edge(exir.EdgeCompileConfig(_check_ir_validity=False))
+    ).to_edge(
+        exir.EdgeCompileConfig(
+            # TODO(T162080278): Duplicated Dequant nodes will be in quantizer spec
+            _check_ir_validity=False,
+            passes=[DuplicateDequantNodePass()],
+        )
+    )
     logging.info(f"Exported graph:\n{edge.exported_program.graph}")
 
     edge.exported_program = to_backend(edge.exported_program, partitioner)