feat: Add ExportedProgram as an IR (#2191)

Signed-off-by: Dheeraj Peri <[email protected]>

Author: peri044

py/torch_tensorrt/_compile.py

@@ -7,6 +7,7 @@
 import torch
 import torch.fx
 import torch_tensorrt.ts
+from torch._export import ExportedProgram
 from torch_tensorrt._enums import dtype
 from torch_tensorrt._Input import Input
 from torch_tensorrt.dynamo.compile import compile as dynamo_compile
@@ -43,6 +44,7 @@ class _IRType(Enum):
     fx = 1
     dynamo = 2
     torch_compile = 3
+    exported_program = 4
 
 
 class _ModuleType(Enum):
@@ -51,6 +53,7 @@ class _ModuleType(Enum):
     nn = 0
     ts = 1
     fx = 2
+    ep = 3
 
 
 def _parse_module_type(module: Any) -> _ModuleType:
@@ -61,6 +64,8 @@ def _parse_module_type(module: Any) -> _ModuleType:
         return _ModuleType.ts
     elif isinstance(module, torch.fx.GraphModule):
         return _ModuleType.fx
+    elif isinstance(module, ExportedProgram):
+        return _ModuleType.ep
     elif isinstance(module, torch.nn.Module):
         return _ModuleType.nn
     else:
@@ -70,6 +75,7 @@ def _parse_module_type(module: Any) -> _ModuleType:
 def _get_target_ir(module_type: _ModuleType, ir: str) -> _IRType:
     module_is_tsable = any(module_type == t for t in [_ModuleType.nn, _ModuleType.ts])
     module_is_fxable = any(module_type == t for t in [_ModuleType.nn, _ModuleType.fx])
+    module_is_exportable = module_type == _ModuleType.ep
 
     ir_targets_torchscript = any(ir == opt for opt in ["torchscript", "ts"])
     ir_targets_fx = ir == "fx"
@@ -95,8 +101,16 @@ def _get_target_ir(module_type: _ModuleType, ir: str) -> _IRType:
                     "Input graph is a Torchscript module but the ir provided is default (dynamo). Please set ir=torchscript to suppress the warning. Compiling the module with ir=torchscript"
                 )
                 return _IRType.ts
+            elif module_is_exportable:
+                raise ValueError(
+                    "Input graph is an ExportedProgram which is not currently supported. Please provide torch.nn.Module or torch.fx.GraphModule as input."
+                )
             else:
                 raise ValueError("Module was provided in an unsupported format")
+        elif ir == "exported_program":
+            raise ValueError(
+                "ir=exported_program is not currently supported. Supported ir options : ts|fx|dynamo"
+            )
         else:
             raise ValueError("Unknown ir was requested")