Enabled refit on Python 3.13

Author: cehongwang

py/torch_tensorrt/_features.py

@@ -37,7 +37,7 @@
 _TORCHTRT_RT_AVAIL = _TS_FE_AVAIL or os.path.isfile(linked_file_runtime_full_path)
 _DYNAMO_FE_AVAIL = version.parse(sanitized_torch_version()) >= version.parse("2.1.dev")
 _FX_FE_AVAIL = True
-_REFIT_AVAIL = version.parse(sys.version.split()[0]) < version.parse("3.13")
+_REFIT_AVAIL = version.parse(sys.version.split()[0]) < version.parse("3.14")
 
 ENABLED_FEATURES = FeatureSet(
     _TS_FE_AVAIL, _TORCHTRT_RT_AVAIL, _DYNAMO_FE_AVAIL, _FX_FE_AVAIL, _REFIT_AVAIL

py/torch_tensorrt/dynamo/_refit.py

@@ -62,26 +62,13 @@ def construct_refit_mapping(
     Returns:
         Mapping from weight name in TensorRT to actual weight value in np.ndarray
     """
-    MODULE_MAP = {
-        "SCALE": (trt.IScaleLayer, [("scale", "SCALE"), ("shift", "SHIFT")]),
-        "CONVOLUTION": (
-            trt.IConvolutionLayer,
-            [("kernel", "KERNEL"), ("bias", "BIAS")],
-        ),
-        "DECONVOLUTION": (
-            trt.IDeconvolutionLayer,
-            [("kernel", "KERNEL"), ("bias", "BIAS")],
-        ),
-        "CONSTANT": (trt.IConstantLayer, [("weights", "CONSTANT")]),
-    }
 
     output_dtypes = infer_module_output_dtypes(
         module,
         truncate_double=settings.truncate_double,
     )
 
     # Use Interpreter
-    weight_map = {}
     interpreter = TRTInterpreter(
         module,
         inputs,
@@ -90,24 +77,8 @@ def construct_refit_mapping(
         compilation_settings=settings,
     )
     interpreter._construct_trt_network_def()
-    net = interpreter.ctx.net
-    for i in range(net.num_layers):
-        layer = net[i]
-        layer_type: str = layer.type.name
-        if layer_type in MODULE_MAP:
-            # Cast the parent class to child class to access attributes
-            # For example: ILayer does not have ILayer.kernel/ILayer.bias
-            # So we cast it to IConvolutionLayer and access the attributes
-            layer.__class__ = MODULE_MAP[layer_type][0]
-            for weight_type, weight_name in MODULE_MAP[layer_type][1]:
-                weight = layer.__getattribute__(weight_type).copy()
-                weight_dtype = dtype.try_from(weight.dtype).to(trt.DataType)
-                weight_map[f"{layer.name} {weight_name}"] = (
-                    weight,
-                    weight_dtype,
-                )
 
-    return weight_map
+    return interpreter.ctx.mapping
 
 
 @needs_refit
@@ -118,13 +89,12 @@ def construct_refit_mapping_from_weight_name_map(
 ) -> dict[Any, Any]:
     engine_weight_map = {}
     for engine_weight_name, (sd_weight_name, np_weight_type) in weight_name_map.items():
-        trt_dtype = dtype.try_from(np_weight_type).to(trt.DataType)
-        torch_dtype = dtype.try_from(np_weight_type).to(torch.dtype)
-
         if sd_weight_name not in state_dict:
             # If weights is not in sd, we can leave it unchanged
             continue
         else:
+            trt_dtype = dtype.try_from(np_weight_type).to(trt.DataType)
+            torch_dtype = dtype.try_from(np_weight_type).to(torch.dtype)
             engine_weight_map[engine_weight_name] = state_dict[sd_weight_name].to(
                 to_torch_device(settings.device)
             )
@@ -208,8 +178,9 @@ def _refit_single_trt_engine_with_gm(
                 if layer_name not in mapping:
                     raise AssertionError(f"{layer_name} is not found in weight mapping")
                 # Use Numpy to create weights
-                weight, datatype = mapping[layer_name]
-                trt_wt_tensor = trt.Weights(datatype, weight.ctypes.data, weight.size)
+                weight = mapping[layer_name]
+                trt_dtype = dtype.try_from(weight.dtype).to(trt.DataType)
+                trt_wt_tensor = trt.Weights(trt_dtype, weight.ctypes.data, weight.size)
                 refitter.set_named_weights(layer_name, trt_wt_tensor, trt_wt_location)
                 refitted.add(layer_name)
 

py/torch_tensorrt/dynamo/conversion/_ConversionContext.py

@@ -1,4 +1,5 @@
 from dataclasses import dataclass, field
+from typing import Any, Dict
 
 from torch_tensorrt.dynamo._settings import CompilationSettings
 from torch_tensorrt.fx.types import TRTNetwork
@@ -19,3 +20,4 @@ class ConversionContext:
         default_factory=CompilationSettings
     )
     requires_output_allocator: bool = False
+    mapping: Dict[str, Any] = field(default_factory=dict)

py/torch_tensorrt/dynamo/conversion/_TRTInterpreter.py

@@ -498,19 +498,15 @@ def _save_weight_mapping(self) -> None:
             for k, v in self.module.state_dict().items()
         }
         weight_name_map: dict[str, Any] = {}
-        np_map = {}
-        constant_mapping = {}
+        np_map = self.ctx.mapping
+        constant_mapping = {k: v for k, v in np_map.items() if v.size == 1}
         net = self.ctx.net
         for i in range(net.num_layers):
             layer = net[i]
             layer_type: str = layer.type.name
             if layer_type in MODULE_MAP:
-                layer.__class__ = MODULE_MAP[layer_type][0]
                 # Name mapping
                 for weight_type, weight_name, torch_attr in MODULE_MAP[layer_type][1]:
-                    weight = layer.__getattribute__(weight_type).copy()
-                    if weight.size == 0:
-                        continue
                     engine_weight_name = f"{layer.name} {weight_name}"
                     # Infer the corresponding weight name(s) in state_dict
                     sd_weight_name_list = (
@@ -538,17 +534,15 @@ def _save_weight_mapping(self) -> None:
                         elif "bias" in suffix:
                             sd_weight_name = f"{sd_weight_name}.bias"
                         else:
-                            # Save the constant weights for future fast refit
                             sd_weight_name = f"{sd_weight_name}.unknown"
-                            constant_mapping[engine_weight_name] = weight
                     elif layer_type == "SCALE":
                         # Batch norm needs all weights to calculate scale and shift
                         sd_weight_name = [f"{sd_weight_name}.{n}" for n in torch_attr]
                     else:
                         sd_weight_name = f"{sd_weight_name}.{torch_attr}"
 
-                    weight_name_map[engine_weight_name] = sd_weight_name
-                    np_map[engine_weight_name] = weight
+                    if engine_weight_name in np_map:
+                        weight_name_map[engine_weight_name] = sd_weight_name
 
         # Stage 2: Value mapping
         for engine_weight_name, sd_weight_name in weight_name_map.items():

py/torch_tensorrt/dynamo/conversion/converter_utils.py

@@ -363,6 +363,7 @@ def create_constant(
             else:
                 numpy_value = torch_value.numpy()
 
+            ctx.mapping[name + " CONSTANT"] = numpy_value.reshape(-1)
             constant = ctx.net.add_constant(
                 shape,
                 numpy_value,