skip dummy inference and run_shape_analysis (#3212)

py/torch_tensorrt/_compile.py

@@ -502,19 +502,24 @@ def save(
                 "Provided model is a torch.jit.ScriptModule but the output_format specified is exported_program. Please verify the output_format"
             )
         else:
+            if arg_inputs is not None:
+                logger.warning(
+                    "Provided model is a torch.jit.ScriptModule, inputs or arg_inputs is not necessary during save."
+                )
             torch.jit.save(module, file_path)
     elif module_type == _ModuleType.ep:
         if output_format == "torchscript":
             raise ValueError(
                 "Provided model is a torch.export.ExportedProgram but the output_format specified is torchscript. Please verify the output_format"
             )
         else:
+            if arg_inputs is not None:
+                logger.warning(
+                    "Provided model is a torch.export.ExportedProgram, inputs or arg_inputs is not necessary during save, it uses the inputs or arg_inputs provided during export and compile"
+                )
             torch.export.save(module, file_path)
     elif module_type == _ModuleType.fx:
-        if arg_inputs is None:
-            raise ValueError(
-                "Provided model is a torch.fx.GraphModule however the inputs are empty. Please provide valid torch.tensors as inputs to trace and save the model"
-            )
+
         # The module type is torch.fx.GraphModule
         if output_format == "torchscript":
             module_ts = torch.jit.trace(
@@ -525,11 +530,19 @@ def save(
             if not retrace:
                 from torch_tensorrt.dynamo._exporter import export
 
-                exp_program = export(module, arg_inputs, kwarg_inputs)
+                if arg_inputs is not None:
+                    logger.warning(
+                        "Provided model is a torch.fx.GraphModule and retrace is False, inputs or arg_inputs is not necessary during save."
+                    )
+                exp_program = export(module)
                 torch.export.save(exp_program, file_path)
             else:
                 from torch._higher_order_ops.torchbind import enable_torchbind_tracing
 
+                if arg_inputs is None:
+                    raise ValueError(
+                        "Provided model is a torch.fx.GraphModule and retrace is True, however the inputs or arg_inputs are empty. Please provide valid torch.tensors as inputs or arg_inputs to trace and save the model"
+                    )
                 with enable_torchbind_tracing():
                     exp_program = torch.export.export(
                         module, tuple(arg_inputs), kwargs=kwarg_inputs, strict=False

py/torch_tensorrt/dynamo/_compiler.py

@@ -36,6 +36,7 @@
 )
 from torch_tensorrt.dynamo.utils import (
     get_flat_args_with_check,
+    get_output_metadata,
     parse_graph_io,
     prepare_inputs,
     set_log_level,
@@ -302,7 +303,6 @@ def compile(
 
     settings = CompilationSettings(**compilation_options)
     logger.info("Compilation Settings: %s\n", settings)
-
     exported_program = pre_export_lowering(exported_program, settings)
     exported_program = exported_program.run_decompositions(
         get_decompositions(enable_experimental_decompositions)
@@ -433,6 +433,12 @@ def contains_metadata(gm: torch.fx.GraphModule) -> bool:
     if not settings.use_fast_partitioner:
         dryrun_tracker.to_run_in_torch.extend(parse_non_trt_nodes(partitioned_module))
 
+    submodule_node_dict = {}
+    for node in partitioned_module.graph.nodes:
+        if "_run_on_acc" not in node.name:
+            continue
+        submodule_node_dict[node.name] = node
+
     # Store TRT replicas of Torch subgraphs
     trt_modules = {}
     # Iterate over all components that can be accelerated
@@ -452,6 +458,26 @@ def contains_metadata(gm: torch.fx.GraphModule) -> bool:
             )
             continue
 
+        if name not in submodule_node_dict:
+            raise ValueError(
+                f"node_name: {name} does not exist in the submodule node dictionary"
+            )
+
+        # set the submodule metadata back to the parent trt_module_node
+        metadata_list = get_output_metadata(submodule)
+        assert len(metadata_list) > 0
+        metadata_keys = ["val", "tensor_meta"]
+        for key in metadata_keys:
+            if key not in submodule_node_dict[name].meta:
+                meta_val_list = [
+                    metadata[key] for metadata in metadata_list if key in metadata
+                ]
+                submodule_node_dict[name].meta[key] = meta_val_list
+                logger.debug(
+                    f"Updated metadata for node: {name} with its corresponding submodule outputs"
+                )
+                break
+
         subgraph_data = PerSubgraphData()
         subgraph_data.subgraph_name = name
         subgraph_data.subgraph_op_count = len(

py/torch_tensorrt/dynamo/_exporter.py

@@ -1,6 +1,6 @@
 import copy
 import operator
-from typing import Any, Dict, Optional, Sequence, Tuple, cast
+from typing import Any, Dict, Sequence, Tuple, cast
 
 import torch
 from torch._guards import detect_fake_mode
@@ -16,31 +16,24 @@
     OutputSpec,
     TensorArgument,
 )
-from torch_tensorrt.dynamo import partitioning
 
 
 def export(
     gm: torch.fx.GraphModule,
-    inputs: Sequence[torch.Tensor],
-    kwarg_inputs: Optional[dict[str, Any]] = None,
 ) -> ExportedProgram:
     """Export the result of TensorRT compilation into the desired output format.
 
     Arguments:
         gm (torch.fx.GraphModule): Compiled Torch-TensorRT module, generated by ``torch_tensorrt.dynamo.compile``
         inputs (torch.Tensor): Torch input tensors
     """
-    if kwarg_inputs is None:
-        kwarg_inputs = {}
-    patched_module = transform(gm, inputs, kwarg_inputs)
+    patched_module = transform(gm)
     exp_program = create_trt_exp_program(patched_module)
     return exp_program
 
 
 def transform(
     gm: torch.fx.GraphModule,
-    inputs: Sequence[torch.Tensor],
-    kwarg_inputs: Optional[dict[str, Any]] = None,
 ) -> torch.fx.GraphModule:
     """
     Transforms the graphmodule by inlining Pytorch and TensorRT submodules.
@@ -55,14 +48,10 @@ def transform(
     """
     # Make a copy the graph since this function transforms the input graph and changes it's attributes.
     # This transformed graph is meant to be consumed by `create_trt_exp_program`
-    if kwarg_inputs is None:
-        kwarg_inputs = {}
     gm = copy.deepcopy(gm)
-    # Run shape analysis
-    _, outputs_map = partitioning.run_shape_analysis(gm, inputs, kwarg_inputs)
 
     # Inline TensorRT submodules
-    inline_trt_modules(gm, outputs_map)
+    inline_trt_modules(gm)
 
     # Inline pytorch submodules
     inline_torch_modules(gm)
@@ -361,9 +350,7 @@ def create_trt_exp_program(
     return trt_exp_program
 
 
-def inline_trt_modules(
-    gm: torch.fx.GraphModule, outputs_map: Dict[Any, Sequence[Any]]
-) -> torch.fx.GraphModule:
+def inline_trt_modules(gm: torch.fx.GraphModule) -> torch.fx.GraphModule:
     """
     Replace TRT submodules with trt engine nodes.
     """
@@ -379,7 +366,11 @@ def inline_trt_modules(
         trt_module_node = trt_module_node[0]
         assert trt_module_node.args
 
-        num_outputs = len(outputs_map[trt_module_node.name])
+        if "val" not in trt_module_node.meta:
+            raise ValueError(
+                f"trt_module_node: {trt_module_node.name} does not have the metadata which should be set during dynamo compile_module step."
+            )
+        num_outputs = len(trt_module_node.meta["val"])
         # Insert a call_function node to perform inference on TRT engine
         with gm.graph.inserting_before(trt_module_node):
             engine_name = f"{name}_engine"
@@ -390,19 +381,9 @@ def inline_trt_modules(
                 torch.ops.tensorrt.execute_engine.default,
                 (trt_module_node.args, engine_node),
             )
-            trt_node.meta["val"] = []
+            # set trt_node.meta with trt_module_node.meta
             assert num_outputs > 0
-            # Generate meta data for TRT node (a FakeTensor with corresponding output shape)
-            for idx in range(num_outputs):
-                trt_node.meta["val"].append(
-                    cast(
-                        FakeTensor,
-                        torch.empty_strided(
-                            tuple(outputs_map[trt_module_node.name][idx]),
-                            tuple([1] * len(outputs_map[trt_module_node.name][idx])),
-                        ),
-                    )
-                )
+            trt_node.meta["val"] = trt_module_node.meta["val"]
 
             # meta["val"] should be a lighter version of a tensor. For eg: it should be a FakeTensor (with output shape and dtype properties)
             # Lighter version of a custom_obj is not defined clearly. meta["val"] does not have any type expectations but

py/torch_tensorrt/dynamo/_refit.py

@@ -74,8 +74,6 @@ def construct_refit_mapping(
 
     output_dtypes = infer_module_output_dtypes(
         module,
-        inputs,
-        settings.device,
         truncate_double=settings.truncate_double,
     )
 

py/torch_tensorrt/dynamo/conversion/_conversion.py

@@ -5,8 +5,6 @@
 
 import tensorrt as trt
 import torch
-from torch.fx.experimental.proxy_tensor import unset_fake_temporarily
-from torch_tensorrt._Device import Device
 from torch_tensorrt._enums import dtype
 from torch_tensorrt._features import ENABLED_FEATURES
 from torch_tensorrt._Input import Input
@@ -17,58 +15,22 @@
     TRTInterpreterResult,
 )
 from torch_tensorrt.dynamo.runtime import PythonTorchTensorRTModule, TorchTensorRTModule
-from torch_tensorrt.dynamo.utils import get_model_device, get_torch_inputs
+from torch_tensorrt.dynamo.utils import get_output_dtypes
 
 logger = logging.getLogger(__name__)
 
 
 def infer_module_output_dtypes(
     module: torch.fx.GraphModule,
-    inputs: Sequence[Input],
-    device: Device,
-    kwarg_inputs: Optional[dict[str, Any]] = None,
     truncate_double: bool = False,
 ) -> List[dtype]:
     """
-    This function performs model inference to determine the output dtypes
-    and truncates them accordingly. inputs can be either arg_inputs or flattened input list.
-    If it is flattened list, kwarg_inputs should be None, as it is already included in the flattened input.
+    This function get the output dtypes from node.meta['val'] which was set during dynamo compile_module step
+    and truncates them accordingly.
     """
-    # TODO: We can also determine output dtypes from the module.graph based on node metadata.
-    # However, our converter tests use fx.symbolic_trace which sometimes does not provide metadata,
-    # so we stick to the model inference approach currently.
-    with unset_fake_temporarily():
-        # Get the device on which the model exists
-        # For large models, this can be done on CPU to save GPU memory allocation for TRT.
-        device = get_model_device(module)
-        torch_inputs = get_torch_inputs(inputs, device)
-        if kwarg_inputs is None:
-            kwarg_inputs = {}
-        torch_kwarg_inputs = get_torch_inputs(kwarg_inputs, device)
-        module_outputs = module(*torch_inputs, **torch_kwarg_inputs)
-        if not isinstance(module_outputs, (list, tuple)):
-            module_outputs = [module_outputs]
-
-    # Int64 outputs can sometimes be generated from within other operators
-    # such as aten.sum - such outputs can be truncated
-    output_dtypes = []
-    for output in module_outputs:
-        output_ = output
-        # We don't need to check if output is nested here because the input module will be flattened
-        if not isinstance(output, torch.Tensor):
-            if isinstance(output, str):
-                raise ValueError(
-                    f"Received an output type {type(output)} that's not in the acceptable datatypes (https://pytorch.org/docs/stable/tensor_attributes.html#torch.dtype)"
-                )
-            else:
-                output_ = torch.tensor(output)
-
-        if truncate_double and output_.dtype == dtype.float64:
-            output_dtypes.append(dtype.float32)
-        else:
-            output_dtypes.append(dtype._from(output_.dtype))
-
-    return output_dtypes
+    outputs = [node for node in module.graph.nodes if node.op == "output"]
+    outputs = outputs[0].args
+    return get_output_dtypes(outputs, truncate_double)
 
 
 def interpret_module_to_result(
@@ -91,22 +53,9 @@ def interpret_module_to_result(
     Returns:
         TRTInterpreterResult
     """
-    if arg_inputs is not None:
-        output_dtypes = infer_module_output_dtypes(
-            module,
-            arg_inputs,
-            settings.device,
-            kwarg_inputs=kwarg_inputs,
-            truncate_double=settings.truncate_double,
-        )
-    else:
-        # args and kwargs are combined and flattened to one list
-        output_dtypes = infer_module_output_dtypes(
-            module,
-            inputs,
-            settings.device,
-            truncate_double=settings.truncate_double,
-        )
+    output_dtypes = infer_module_output_dtypes(
+        module, truncate_double=settings.truncate_double
+    )
 
     interpreter = TRTInterpreter(
         module,

py/torch_tensorrt/dynamo/lowering/passes/lower_linear.py

@@ -1,11 +1,11 @@
 import logging
-from typing import Callable, Tuple
 
 import torch
 from torch_tensorrt.dynamo._settings import CompilationSettings
 from torch_tensorrt.dynamo.lowering.passes.pass_utils import (
     clean_up_graph_after_modifications,
 )
+from torch_tensorrt.dynamo.utils import get_metadata, set_metadata
 
 logger = logging.getLogger(__name__)
 
@@ -14,33 +14,29 @@ def lower_linear(
     gm: torch.fx.GraphModule, settings: CompilationSettings
 ) -> torch.fx.GraphModule:
     """Replace aten.linear with an equivalent implementation which can be easily converted to TRT"""
-    orig, replacement = linear_replacement()
-
-    if torch.fx.subgraph_rewriter.replace_pattern(gm, orig, replacement):
-        gm = clean_up_graph_after_modifications(gm)
-        logger.debug(f"Graph after lowering linear:\n{gm.graph}")
-
-    return gm
-
-
-def linear_replacement() -> Tuple[
-    torch.fx.GraphModule,
-    Callable[[torch.Tensor, torch.Tensor, torch.Tensor], torch.Tensor],
-]:
-    """Constructs the original and replacement functions for linear"""
+    orig_op = torch.ops.aten.addmm.default
+    replacement_op = torch.ops.aten.linear.default
 
     # Original graph
     def orig(
         input: torch.Tensor, weight: torch.Tensor, bias: torch.Tensor
     ) -> torch.Tensor:
         W_T = torch.ops.aten.permute.default(weight, [1, 0])
-        out = torch.ops.aten.addmm.default(bias, input, W_T)
+        out = orig_op(bias, input, W_T)
         return out
 
     # Replacement graph
     def replacement(
         input: torch.Tensor, weight: torch.Tensor, bias: torch.Tensor
     ) -> torch.Tensor:
-        return torch.ops.aten.linear.default(input, weight, bias)
+        return replacement_op(input, weight, bias)
+
+    metadata = get_metadata(gm, orig_op)
+    replaced_nodes = torch.fx.subgraph_rewriter.replace_pattern(gm, orig, replacement)
+
+    if len(replaced_nodes) > 0:
+        gm = clean_up_graph_after_modifications(gm)
+        set_metadata(gm, replacement_op, metadata)
+        logger.debug(f"Graph after lowering linear:\n{gm.graph}")
 
-    return orig, replacement
+    return gm