Print delegation info in export_llama in verbose (#7803)

Co-authored-by: Martin Yuan <[email protected]>

examples/models/llama/export_llama_lib.py

@@ -21,6 +21,7 @@
 
 import pkg_resources
 import torch
+from executorch.devtools.backend_debug import get_delegation_info
 
 from executorch.devtools.etrecord import generate_etrecord
 from executorch.exir.passes.init_mutable_pass import InitializedMutableBufferPass
@@ -43,6 +44,7 @@
     get_vulkan_quantizer,
 )
 from executorch.util.activation_memory_profiler import generate_memory_trace
+from tabulate import tabulate
 
 from ..model_factory import EagerModelFactory
 from .source_transformation.apply_spin_quant_r1_r2 import (
@@ -777,6 +779,12 @@ def _export_llama(args) -> LLMEdgeManager:  # noqa: C901
     for partitioner in partitioners:
         logging.info(f"--> {partitioner.__class__.__name__}")
 
+    def print_delegation_info(graph_module: torch.fx.GraphModule):
+        delegation_info = get_delegation_info(graph_module)
+        print(delegation_info.get_summary())
+        df = delegation_info.get_operator_delegation_dataframe()
+        print(tabulate(df, headers="keys", tablefmt="fancy_grid"))
+
     additional_passes = []
     if args.model in TORCHTUNE_DEFINED_MODELS:
         additional_passes = [InitializedMutableBufferPass(["kv_cache_pos"])]
@@ -788,6 +796,8 @@ def _export_llama(args) -> LLMEdgeManager:  # noqa: C901
         # Copy the edge manager which will be serialized into etrecord. This is memory-wise expensive.
         edge_manager_copy = copy.deepcopy(builder_exported_to_edge.edge_manager)
         builder = builder_exported_to_edge.to_backend(partitioners)
+        if args.verbose:
+            print_delegation_info(builder.edge_manager.exported_program().graph_module)
         if args.num_sharding > 0 and args.qnn:
             from executorch.backends.qualcomm.utils.utils import canonicalize_program
 
@@ -808,6 +818,8 @@ def _export_llama(args) -> LLMEdgeManager:  # noqa: C901
             logging.info("Generated etrecord.bin")
     else:
         builder = builder_exported_to_edge.to_backend(partitioners)
+        if args.verbose:
+            print_delegation_info(builder.edge_manager.exported_program().graph_module)
         if args.num_sharding > 0 and args.qnn:
             from executorch.backends.qualcomm.utils.utils import canonicalize_program