[#8460][feat] Revive and simplify Model Explorer visualization integration

tensorrt_llm/_torch/auto_deploy/transform/library/visualization.py

@@ -1,6 +1,5 @@
 """Transformation to the graph to render nicely in model_explorer."""
 
-import json
 from typing import Tuple
 
 import torch
@@ -9,69 +8,13 @@
 
 from ...models.factory import ModelFactory
 from ...shim.interface import CachedSequenceInterface
+from ...utils.logger import ad_logger
 from ..interface import BaseTransform, SharedConfig, TransformInfo, TransformRegistry
 
 try:
     import model_explorer
-    from model_explorer.graph_builder import GraphNode, KeyValue, MetadataItem
-    from model_explorer.pytorch_exported_program_adater_impl import (
-        PytorchExportedProgramAdapterImpl,
-    )
 except ImportError:
     model_explorer = None
-    GraphNode = KeyValue = MetadataItem = PytorchExportedProgramAdapterImpl = None
-    # Optionally, you can log a warning or handle this gracefully elsewhere
-
-
-def print_tensor(self, tensor: torch.Tensor, size_limit: int = 16):
-    shape = tensor.shape
-    total_size = 1
-    for dim in shape:
-        total_size *= dim
-
-    if size_limit < 0 or size_limit >= total_size:
-        return json.dumps(tensor.cpu().detach().to(torch.float32).numpy().tolist())
-
-    return json.dumps(
-        (tensor.cpu().detach().to(torch.float32).numpy().flatten())[:size_limit].tolist()
-    )
-
-
-def _get_shape(val):
-    return json.dumps(
-        list(
-            map(
-                lambda x: int(x) if str(x).isdigit() else str(x),
-                val.shape,
-            )
-        )
-    )
-
-
-def add_outputs_metadata(self, fx_node: torch.fx.node.Node, node: GraphNode):
-    out_vals = fx_node.meta.get("val")
-    if out_vals is None:
-        return
-
-    if isinstance(out_vals, (tuple, list)):
-        for idx, val in enumerate(out_vals):
-            metadata = MetadataItem(id=str(idx), attrs=[])
-            if val is None:
-                continue
-            dtype = str(val.dtype)
-            shape = _get_shape(val)
-            metadata.attrs.append(KeyValue(key="tensor_shape", value=dtype + shape))
-            node.outputsMetadata.append(metadata)
-    elif isinstance(out_vals, torch.Tensor):
-        dtype = str(out_vals.dtype)
-        shape = _get_shape(out_vals)
-        metadata = MetadataItem(id="0", attrs=[KeyValue(key="tensor_shape", value=dtype + shape)])
-        node.outputsMetadata.append(metadata)
-    elif isinstance(out_vals, bool):
-        metadata = MetadataItem(id="0", attrs=[KeyValue(key="tensor_shape", value="bool[1]")])
-        node.outputsMetadata.append(metadata)
-    else:
-        raise ValueError(f"Unsupported output type: {type(out_vals)}")
 
 
 # TODO(yudong): make custom_ops configurable
@@ -87,24 +30,57 @@ def add_outputs_metadata(self, fx_node: torch.fx.node.Node, node: GraphNode):
 
 @TransformRegistry.register("visualize_namespace")
 class VisualizeNamespace(BaseTransform):
+    """Transform to visualize the graph using Model Explorer.
+
+    This transform exports the graph module to an ExportedProgram and launches
+    Model Explorer for interactive visualization. The visualization helps debug
+    and understand the graph structure after AutoDeploy transformations.
+    """
+
     def _apply(
         self,
         gm: GraphModule,
         cm: CachedSequenceInterface,
         factory: ModelFactory,
         shared_config: SharedConfig,
     ) -> Tuple[GraphModule, TransformInfo]:
-        PytorchExportedProgramAdapterImpl.print_tensor = print_tensor
-        PytorchExportedProgramAdapterImpl.add_outputs_metadata = add_outputs_metadata
+        """Export the graph and launch Model Explorer for visualization.
+
+        Args:
+            gm: The graph module to visualize.
+            cm: The cached sequence interface with input arguments.
+            factory: The model factory (unused).
+            shared_config: Shared configuration across transforms (unused).
+
+        Returns:
+            A tuple of the unchanged graph module and transform info indicating
+            whether visualization was successful or skipped.
+        """
+        if model_explorer is None:
+            return gm, TransformInfo(
+                skipped=True, num_matches=0, is_clean=True, has_valid_shapes=True
+            )
+
+        try:
+            # Export graph module to ExportedProgram for visualization
+            exported_program = te.export(gm, args=(), kwargs=cm.named_args, dynamic_shapes=None)
 
-        # TODO(yudong): make viz as non-block call.
-        ep = te.export(gm, args=cm.args, dynamic_shapes=cm.dynamic_shapes)
-        graph = ep.graph
-        # Ensure the ops land up in the right module for better viz
-        for n in graph.nodes:
-            if n.target in CUSTOM_OPS:
-                n.meta["nn_module_stack"] = n.args[0].meta["nn_module_stack"]
+            # Ensure custom ops appear nested under their parent modules
+            for node in exported_program.graph.nodes:
+                if node.target in CUSTOM_OPS:
+                    if node.args and hasattr(node.args[0], "meta"):
+                        node.meta["nn_module_stack"] = node.args[0].meta.get("nn_module_stack", {})
 
-        model_explorer.visualize_pytorch("model-viz", ep)
+            ad_logger.info("Launching Model Explorer visualization...")
+            model_explorer.visualize_pytorch("model-viz", exported_program)
 
-        return gm, TransformInfo(skipped=False, num_matches=1, is_clean=True, has_valid_shapes=True)
+            return gm, TransformInfo(
+                skipped=False, num_matches=1, is_clean=True, has_valid_shapes=True
+            )
+
+        except Exception as e:
+            ad_logger.error(f"Failed to visualize graph with Model Explorer: {e}")
+            # Don't fail the pipeline if visualization fails
+            return gm, TransformInfo(
+                skipped=True, num_matches=0, is_clean=True, has_valid_shapes=True
+            )