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feat: Add Support for Torch AOTI #477

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Merged
whoisj merged 1 commit into from
Mar 5, 2026
Merged

feat: Add Support for Torch AOTI #477

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6 changes: 5 additions & 1 deletion src/constants.h
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Original file line number Diff line number Diff line change
@@ -1,4 +1,4 @@
// Copyright 2018-2025, NVIDIA CORPORATION & AFFILIATES. All rights reserved.
// Copyright 2018-2026, NVIDIA CORPORATION & AFFILIATES. All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions
Expand Down Expand Up @@ -57,6 +57,10 @@ constexpr char kPyTorchLibTorchPlatform[] = "pytorch_libtorch";
constexpr char kPyTorchLibTorchFilename[] = "model.pt";
constexpr char kPyTorchBackend[] = "pytorch";

constexpr char kPyTorchAotiPlatform[] = "torch_aoti";
constexpr char kPyTorchAotiFilename[] = "model.pt2";
constexpr char kPyTorchAotiBackend[] = "pytorch";

constexpr char kPythonFilename[] = "model.py";
constexpr char kPythonBackend[] = "python";

Expand Down
68 changes: 41 additions & 27 deletions src/model_config_utils.cc
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Original file line number Diff line number Diff line change
@@ -1,4 +1,4 @@
// Copyright 2018-2024, NVIDIA CORPORATION & AFFILIATES. All rights reserved.
// Copyright 2018-2026, NVIDIA CORPORATION & AFFILIATES. All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions
Expand Down Expand Up @@ -1072,7 +1072,7 @@ AutoCompleteBackendFields(

// Trying to fill the 'backend', 'default_model_filename' field.

// TensorFlow
// TensorFlow <-- TensorFlow backend is deprecated -->
// For TF backend, the platform is required
if (config->platform().empty()) {
// Check 'backend', 'default_model_filename', and the actual directory
Expand Down Expand Up @@ -1199,33 +1199,39 @@ AutoCompleteBackendFields(

// PyTorch
if (config->backend().empty()) {
if ((config->platform() == kPyTorchLibTorchPlatform) ||
(config->default_model_filename() == kPyTorchLibTorchFilename)) {
// Torch JIT interface
if (config->platform() == kPyTorchLibTorchPlatform ||
config->default_model_filename() == kPyTorchLibTorchFilename) {
config->set_backend(kPyTorchBackend);
} else if (
config->platform().empty() &&
config->default_model_filename().empty() && has_version) {
bool is_dir = false;
if (version_dir_content.find(kPyTorchLibTorchFilename) !=
version_dir_content.end()) {
RETURN_IF_ERROR(IsDirectory(
JoinPath({version_path, kPyTorchLibTorchFilename}), &is_dir));
if (!is_dir) {
config->set_backend(kPyTorchBackend);
}
} else
// Torch AOTI interface
if (config->platform() == kPyTorchAotiPlatform ||
config->default_model_filename() == kPyTorchAotiFilename) {
config->set_backend(kPyTorchAotiBackend);
} else if (
config->platform().empty() &&
config->default_model_filename().empty() && has_version) {
bool is_dir = false;

// Torch JIT interface
if (version_dir_content.find(kPyTorchLibTorchFilename) !=
version_dir_content.end()) {
RETURN_IF_ERROR(IsDirectory(
JoinPath({version_path, kPyTorchLibTorchFilename}), &is_dir));
if (!is_dir) {
config->set_backend(kPyTorchBackend);
}
} else
// Torch AOTI interface
if (version_dir_content.find(kPyTorchAotiFilename) !=
version_dir_content.end()) {
RETURN_IF_ERROR(IsDirectory(
JoinPath({version_path, kPyTorchAotiFilename}), &is_dir));
if (!is_dir) {
config->set_backend(kPyTorchAotiBackend);
}
}
}
}
}
if (config->backend() == kPyTorchBackend) {
if (config->platform().empty()) {
// do not introduce new platforms, new runtimes may ignore this field.
config->set_platform(kPyTorchLibTorchPlatform);
}
if (config->runtime() != kPythonFilename &&
config->default_model_filename().empty()) {
config->set_default_model_filename(kPyTorchLibTorchFilename);
}
return Status::Success;
}

// Python
Expand Down Expand Up @@ -2369,6 +2375,10 @@ GetBackendTypeFromPlatform(const std::string& platform_name)
return BackendType::BACKEND_TYPE_PYTORCH;
}

if (platform_name == kPyTorchAotiPlatform) {
return BackendType::BACKEND_TYPE_TORCHAOTI;
}

return BackendType::BACKEND_TYPE_UNKNOWN;
}

Expand All @@ -2395,6 +2405,10 @@ GetBackendType(const std::string& backend_name)
return BackendType::BACKEND_TYPE_PYTORCH;
}

if (backend_name == kPyTorchAotiBackend) {
return BackendType::BACKEND_TYPE_TORCHAOTI;
}

return BackendType::BACKEND_TYPE_UNKNOWN;
}

Expand Down
5 changes: 3 additions & 2 deletions src/model_config_utils.h
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Original file line number Diff line number Diff line change
@@ -1,4 +1,4 @@
// Copyright 2018-2024, NVIDIA CORPORATION & AFFILIATES. All rights reserved.
// Copyright 2018-2026, NVIDIA CORPORATION & AFFILIATES. All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions
Expand Down Expand Up @@ -39,7 +39,8 @@ enum BackendType {
BACKEND_TYPE_TENSORRT = 1,
BACKEND_TYPE_TENSORFLOW = 2,
BACKEND_TYPE_ONNXRUNTIME = 3,
BACKEND_TYPE_PYTORCH = 4
BACKEND_TYPE_PYTORCH = 4,
BACKEND_TYPE_TORCHAOTI = 4, // Torch AOTI uses the same backend as PyTorch
};

// Get version of a model from the path containing the model
Expand Down
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