tensorrt/include/NvOnnxParser.h

/*

 * SPDX-FileCopyrightText: Copyright (c) 1993-2025 NVIDIA CORPORATION & AFFILIATES. All rights reserved.

 * SPDX-License-Identifier: Apache-2.0

 *

 * Licensed under the Apache License, Version 2.0 (the "License");

 * you may not use this file except in compliance with the License.

 * You may obtain a copy of the License at

 *

 * http://www.apache.org/licenses/LICENSE-2.0

 *

 * Unless required by applicable law or agreed to in writing, software

 * distributed under the License is distributed on an "AS IS" BASIS,

 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

 * See the License for the specific language governing permissions and

 * limitations under the License.

 */

#ifndef NV_ONNX_PARSER_H
#define NV_ONNX_PARSER_H

#include "NvInfer.h"
#include <stddef.h>
#include <string>
#include <vector>

//!
//! \file NvOnnxParser.h
//!
//! This is the API for the ONNX Parser
//!

#define NV_ONNX_PARSER_MAJOR 0
#define NV_ONNX_PARSER_MINOR 1
#define NV_ONNX_PARSER_PATCH 0

static constexpr int32_t NV_ONNX_PARSER_VERSION
    = ((NV_ONNX_PARSER_MAJOR * 10000) + (NV_ONNX_PARSER_MINOR * 100) + NV_ONNX_PARSER_PATCH);

//!
//! \typedef SubGraph_t
//!
//! \brief The data structure containing the parsing capability of
//! a set of nodes in an ONNX graph.
//!
typedef std::pair<std::vector<size_t>, bool> SubGraph_t;

//!
//! \typedef SubGraphCollection_t
//!
//! \brief The data structure containing all SubGraph_t partitioned
//! out of an ONNX graph.
//!
typedef std::vector<SubGraph_t> SubGraphCollection_t;

//!
//! \namespace nvonnxparser
//!
//! \brief The TensorRT ONNX parser API namespace
//!
namespace nvonnxparser
{

//! \return the numerical value of the highest-valued enumerator for type T.
//! It must be specialized for each enum type that uses it.
//! {$nv-internal-release begin}
//! \note This is different from nvinfer1::EnumMax<T>(), which is one more than that.
//! {$nv-internal-release end}
template <typename T>
constexpr int32_t EnumMax() noexcept = delete;

//!
//! \enum ErrorCode
//!
//! \brief The type of error that the parser or refitter may return
//!
enum class ErrorCode : int
{
    kSUCCESS = 0,
    kINTERNAL_ERROR = 1,
    kMEM_ALLOC_FAILED = 2,
    kMODEL_DESERIALIZE_FAILED = 3,
    kINVALID_VALUE = 4,
    kINVALID_GRAPH = 5,
    kINVALID_NODE = 6,
    kUNSUPPORTED_GRAPH = 7,
    kUNSUPPORTED_NODE = 8,
    kUNSUPPORTED_NODE_ATTR = 9,
    kUNSUPPORTED_NODE_INPUT = 10,
    kUNSUPPORTED_NODE_DATATYPE = 11,
    kUNSUPPORTED_NODE_DYNAMIC = 12,
    kUNSUPPORTED_NODE_SHAPE = 13,
    kREFIT_FAILED = 14
};

//! Specialization. See `nvonnxparser::EnumMax()` for details.
template <>
constexpr int32_t EnumMax<ErrorCode>() noexcept
{
    return 14;
}

//!
//! \brief Represents one or more OnnxParserFlag values using binary OR
//! operations, e.g., 1U << OnnxParserFlag::kNATIVE_INSTANCENORM
//!
//! \see IParser::setFlags() and IParser::getFlags()
//!
using OnnxParserFlags
    = uint32_t;

enum class OnnxParserFlag : int32_t
{
    //! Parse the ONNX model into the INetworkDefinition with the intention of using TensorRT's native layer
    //! implementation over the plugin implementation for InstanceNormalization nodes.
    //! This flag is required when building version-compatible or hardware-compatible engines.
    //! This flag is set to be ON by default.
    kNATIVE_INSTANCENORM = 0,
    //! Enable UINT8 as a quantization data type and asymmetric quantization with non-zero zero-point values
    //! in Quantize and Dequantize nodes. This flag is set to be OFF by default.
    //! The resulting engine must be built targeting DLA version >= 3.16.
    kENABLE_UINT8_AND_ASYMMETRIC_QUANTIZATION_DLA = 1,
    //! Parse the ONNX model with per-node validation for DLA. If the model is not fully supported by DLA, then
    //! parsing will fail. If this flag is set, isSubGraphSupported() will also return capability in the context of DLA
    //! support. When this flag is set, a valid IBuilderConfig must be provided to the parser via setBuilderConfig().
    // This flag is set to be OFF by default.
    kREPORT_CAPABILITY_DLA = 2,
    //! Allow a loaded plugin with the same name as an ONNX operator type to override the default ONNX implementation,
    //! even if the plugin namespace attribute is not set.
    //! Useful for custom plugins that replace standard ONNX operators, such as alternative implementations for better
    //! performance. This flag is set to be OFF by default.
    kENABLE_PLUGIN_OVERRIDE = 3,
    //! Opportunistically rewrite or modify layers to make them more amenable to running on DLA.
    kADJUST_FOR_DLA = 4
};

//! Specialization. See `nvonnxparser::EnumMax()` for details.
template <>
constexpr int32_t EnumMax<OnnxParserFlag>() noexcept
{
    return 3;
}

//!
//! \class IParserError
//!
//! \brief an object containing information about an error
//!
class IParserError

{
public:
    //!
    //!\brief the error code.
    //!
    virtual ErrorCode code() const = 0;
    //!
    //!\brief description of the error.
    //!
    virtual char const* desc() const = 0;
    //!
    //!\brief source file in which the error occurred.
    //!
    virtual char const* file() const = 0;
    //!
    //!\brief source line at which the error occurred.
    //!
    virtual int line() const = 0;
    //!
    //!\brief source function in which the error occurred.
    //!
    virtual char const* func() const = 0;
    //!
    //!\brief index of the ONNX model node in which the error occurred.
    //!
    virtual int node() const = 0;
    //!
    //!\brief name of the node in which the error occurred.
    //!
    virtual char const* nodeName() const = 0;
    //!
    //!\brief name of the node operation in which the error occurred.
    //!
    virtual char const* nodeOperator() const = 0;
    //!
    //!\brief A list of the local function names, from the top level down, constituting the current
    //!             stack trace in which the error occurred. A top-level node that is not inside any
    //!             local function would return a nullptr.
    //!
    virtual char const* const* localFunctionStack() const = 0;
    //!
    //!\brief The size of the stack of local functions at the point where the error occurred.
    //!             A top-level node that is not inside any local function would correspond to
    //              a stack size of 0.
    //!
    virtual int32_t localFunctionStackSize() const = 0;

protected:
    virtual ~IParserError() {}
};

//!
//! \class IParser
//!
//! \brief an object for parsing ONNX models into a TensorRT network definition
//!
//! \warning If the ONNX model has a graph output with the same name as a graph input,
//!          the output will be renamed by prepending "__".
//!
//! \warning Do not inherit from this class, as doing so will break forward-compatibility of the API and ABI.
//!
class IParser

{
public:
    //!
    //! \brief Parse a serialized ONNX model into the TensorRT network.
    //!         This method has very limited diagnostics. If parsing the serialized model
    //!         fails for any reason (e.g. unsupported IR version, unsupported opset, etc.)
    //!         it the user responsibility to intercept and report the error.
    //!         To obtain a better diagnostic, use the parseFromFile method below.
    //!
    //! \param serialized_onnx_model Pointer to the serialized ONNX model. Can be freed after this function returns.
    //! \param serialized_onnx_model_size Size of the serialized ONNX model
    //!        in bytes
    //! \param model_path Absolute path to the model file for loading external weights if required
    //! \return true if the model was parsed successfully
    //! \see getNbErrors() getError()
    //!
    virtual bool parse(

        void const* serialized_onnx_model, size_t serialized_onnx_model_size, const char* model_path = nullptr) noexcept
        = 0;

    //!
    //! \brief Parse an onnx model file, which can be a binary protobuf or a text onnx model
    //!         calls parse method inside.
    //!
    //! \param onnxModelFile name
    //! \param verbosity Level
    //!
    //! \return true if the model was parsed successfully
    //!
    //!
    virtual bool parseFromFile(const char* onnxModelFile, int verbosity) noexcept = 0;

    //!
    //! [DEPRECATED] Deprecated in TensorRT 10.1. See supportsModelV2.
    //!
    //! \brief Check whether TensorRT supports a particular ONNX model.
    //!        If the function returns True, one can proceed to engine building
    //!        without having to call \p parse or \p parseFromFile.
    //!
    //! \param serialized_onnx_model Pointer to the serialized ONNX model. Can be freed after this function returns.
    //! \param serialized_onnx_model_size Size of the serialized ONNX model
    //!        in bytes
    //! \param sub_graph_collection Container to hold supported subgraphs
    //! \param model_path Absolute path to the model file for loading external weights if required
    //! \return true if the model is supported
    //!
    TRT_DEPRECATED virtual bool supportsModel(void const* serialized_onnx_model, size_t serialized_onnx_model_size,

        SubGraphCollection_t& sub_graph_collection, const char* model_path = nullptr) noexcept = 0;

    //!
    //! [DEPRECATED] Deprecated in TensorRT 10.13. See loadInitializer().
    //!
    //!\brief Parse a serialized ONNX model into the TensorRT network
    //! with consideration of user provided weights
    //!
    //! \param serialized_onnx_model Pointer to the serialized ONNX model. Can be freed after this function returns.
    //! \param serialized_onnx_model_size Size of the serialized ONNX model
    //!        in bytes
    //! \return true if the model was parsed successfully
    //! \see getNbErrors() getError()
    //!
    TRT_DEPRECATED virtual bool parseWithWeightDescriptors(

        void const* serialized_onnx_model, size_t serialized_onnx_model_size) noexcept = 0;

    //!
    //!\brief Returns whether the specified operator may be supported by the
    //!         parser.
    //!
    //! Note that a result of true does not guarantee that the operator will be
    //! supported in all cases (i.e., this function may return false-positives).
    //!
    //! \param op_name The name of the ONNX operator to check for support
    //!
    virtual bool supportsOperator(const char* op_name) const noexcept = 0;

    //!
    //!\brief Get the number of errors that occurred during prior calls to
    //!         \p parse
    //!
    //! \see getError() clearErrors() IParserError
    //!
    virtual int getNbErrors() const noexcept = 0;

    //!
    //!\brief Get an error that occurred during prior calls to \p parse
    //!
    //! \see getNbErrors() clearErrors() IParserError
    //!
    virtual IParserError const* getError(int index) const noexcept = 0;

    //!
    //!\brief Clear errors from prior calls to \p parse
    //!
    //! \see getNbErrors() getError() IParserError
    //!
    virtual void clearErrors() noexcept = 0;

    virtual ~IParser() noexcept = default;

    //!
    //! \brief Query the plugin libraries needed to implement operations used by the parser in a version-compatible
    //! engine.
    //!
    //! This provides a list of plugin libraries on the filesystem needed to implement operations
    //! in the parsed network.  If you are building a version-compatible engine using this network,
    //! provide this list to IBuilderConfig::setPluginsToSerialize to serialize these plugins along
    //! with the version-compatible engine, or, if you want to ship these plugin libraries externally
    //! to the engine, ensure that IPluginRegistry::loadLibrary is used to load these libraries in the
    //! appropriate runtime before deserializing the corresponding engine.
    //!
    //! \param[out] nbPluginLibs Returns the number of plugin libraries in the array, or -1 if there was an error.
    //! \return Array of `nbPluginLibs` C-strings describing plugin library paths on the filesystem if nbPluginLibs > 0,
    //! or nullptr otherwise.  This array is owned by the IParser, and the pointers in the array are only valid until
    //! the next call to parse(), supportsModel(), parseFromFile(), or parseWithWeightDescriptors().
    //!
    virtual char const* const* getUsedVCPluginLibraries(int64_t& nbPluginLibs) const noexcept = 0;

    //!
    //! \brief Set the parser flags.
    //!
    //! The flags are listed in the OnnxParserFlag enum.
    //!
    //! \param OnnxParserFlags The flags used when parsing an ONNX model.
    //!
    //! \note This function will override the previous set flags, rather than bitwise ORing the new flag.
    //!
    //! \see getFlags()
    //!
    virtual void setFlags(OnnxParserFlags onnxParserFlags) noexcept = 0;

    //!
    //! \brief Get the parser flags. Defaults to 0.
    //!
    //! \return The parser flags as a bitmask.
    //!
    //! \see setFlags()
    //!
    virtual OnnxParserFlags getFlags() const noexcept = 0;

    //!
    //! \brief clear a parser flag.
    //!
    //! clears the parser flag from the enabled flags.
    //!
    //! \see setFlags()
    //!
    virtual void clearFlag(OnnxParserFlag onnxParserFlag) noexcept = 0;

    //!
    //! \brief Set a single parser flag.
    //!
    //! Add the input parser flag to the already enabled flags.
    //!
    //! \see setFlags()
    //!
    virtual void setFlag(OnnxParserFlag onnxParserFlag) noexcept = 0;

    //!
    //! \brief Returns true if the parser flag is set
    //!
    //! \see getFlags()
    //!
    //! \return True if flag is set, false if unset.
    //!
    virtual bool getFlag(OnnxParserFlag onnxParserFlag) const noexcept = 0;

    //!
    //!\brief Return the i-th output ITensor object for the ONNX layer "name".
    //!
    //! Return the i-th output ITensor object for the ONNX layer "name".
    //! If "name" is not found or i is out of range, return nullptr.
    //! In the case of multiple nodes sharing the same name this function will return
    //! the output tensors of the first instance of the node in the ONNX graph.
    //!
    //! \param name The name of the ONNX layer.
    //!
    //! \param i The index of the output. i must be in range [0, layer.num_outputs).
    //!
    virtual nvinfer1::ITensor const* getLayerOutputTensor(char const* name, int64_t i) noexcept = 0;

    //!
    //! \brief Check whether TensorRT supports a particular ONNX model.
    //!            If the function returns True, one can proceed to engine building
    //!            without having to call \p parse or \p parseFromFile.
    //!            Results can be queried through \p getNbSubgraphs, \p isSubgraphSupported,
    //!            \p getSubgraphNodes.
    //!
    //! \param serializedOnnxModel Pointer to the serialized ONNX model. Can be freed after this function returns.
    //! \param serializedOnnxModelSize Size of the serialized ONNX model in bytes
    //! \param modelPath Absolute path to the model file for loading external weights if required
    //! \return true if the model is supported
    //!
    virtual bool supportsModelV2(

        void const* serializedOnnxModel, size_t serializedOnnxModelSize, char const* modelPath = nullptr) noexcept = 0;

    //!
    //! \brief Get the number of subgraphs. Calling this function before calling \p supportsModelV2 results in undefined
    //! behavior.
    //!
    //!
    //! \return Number of subgraphs.
    //!
    virtual int64_t getNbSubgraphs() noexcept = 0;

    //!
    //! \brief Returns whether the subgraph is supported. Calling this function before calling \p supportsModelV2
    //! results in undefined behavior.
    //!
    //!
    //! \param index Index of the subgraph.
    //! \return Whether the subgraph is supported.
    //!
    virtual bool isSubgraphSupported(int64_t const index) noexcept = 0;

    //!
    //! \brief Get the nodes of the specified subgraph. Calling this function before calling \p supportsModelV2 results
    //! in undefined behavior.
    //!
    //!
    //! \param index Index of the subgraph.
    //! \param subgraphLength Returns the length of the subgraph as reference.
    //!
    //! \return Pointer to the subgraph nodes array. This pointer is owned by the Parser.
    //!
    virtual int64_t* getSubgraphNodes(int64_t const index, int64_t& subgraphLength) noexcept = 0;

    //!
    //! \brief Load a serialized ONNX model into the parser. Unlike the parse(), parseFromFile(), or
    //! parseWithWeightDescriptors() functions, this function does not immediately convert the model into a TensorRT
    //! INetworkDefinition. Using this function allows users to provide their own initializers for the ONNX model
    //! through the loadInitializer() function.
    //!
    //! Only one model can be loaded at a time. Subsequent calls to loadModelProto() will result in an error.
    //!
    //! To begin the conversion of the model into a TensorRT INetworkDefinition, use parseModelProto().
    //!
    //! \param serializedOnnxModel Pointer to the serialized ONNX model. Can be freed after this function returns.
    //! \param serializedOnnxModelSize Size of the serialized ONNX model in bytes.
    //! \param modelPath Absolute path to the model file for loading external weights if required.
    //! \return true if the model was loaded successfully
    //! \see getNbErrors() getError()
    //!
    virtual bool loadModelProto(

        void const* serializedOnnxModel, size_t serializedOnnxModelSize, char const* modelPath = nullptr) noexcept = 0;

    //!
    //! \brief Prompt the ONNX parser to load an initializer with user-provided binary data.
    //! The lifetime of the data must exceed the lifetime of the parser.
    //!
    //! All user-provided initializers must be provided prior to calling refitModelProto().
    //!
    //! This function can be called multiple times to specify the names of multiple initializers.
    //!
    //! Calling this function with an initializer previously specified will overwrite the previous instance.
    //!
    //!
    //! This function will return false if initializer validation fails. Possible validation errors are:
    //! * This function was called prior to loadModelProto().
    //! * The requested initializer was not found in the model.
    //! * The size of the data provided is different from the corresponding initializer in the model.
    //!
    //! \param name Name of the initializer.
    //! \param data Binary data containing the values of the initializer.
    //! \param size Size of the initializer in bytes.
    //! \return true if the initializer was loaded successfully
    //! \see loadModelProto()
    //!
    virtual bool loadInitializer(char const* name, void const* data, size_t size) noexcept = 0;

    //! \brief Begin the parsing and conversion process of the loaded ONNX model into a TensorRT INetworkDefinition.
    //!
    //! \return true if conversion was successful
    //! \see getNbErrors() getError() loadModelProto() loadModelProtoFromFile()
    //!
    virtual bool parseModelProto() noexcept = 0;

    //!
    //! \brief Set the BuilderConfig for the parser.
    //!
    //! \return true if the IBuilderConfig was set successfully, false otherwise.
    //!
    virtual bool setBuilderConfig(const nvinfer1::IBuilderConfig* const builderConfig) noexcept = 0;
};

//!
//! \class IParserRefitter
//!
//! \brief An interface designed to refit weights from an ONNX model.
//!
//! \warning Do not inherit from this class, as doing so will break forward-compatibility of the API and ABI.
//!
class IParserRefitter

{
public:
    //!
    //! \brief Load a serialized ONNX model from memory and perform weight refit.
    //!
    //! \param serializedOnnxModel Pointer to the serialized ONNX model
    //! \param serializedOnnxModelSize Size of the serialized ONNX model
    //!        in bytes
    //! \param modelPath Absolute path to the model file for loading external weights if required
    //! \return true if all the weights in the engine were refit successfully.
    //!
    //! The serialized ONNX model must be identical to the one used to generate the engine
    //! that will be refit.
    //!
    virtual bool refitFromBytes(

        void const* serializedOnnxModel, size_t serializedOnnxModelSize, char const* modelPath = nullptr) noexcept
        = 0;

    //!
    //! \brief Load and parse a ONNX model from disk and perform weight refit.
    //!
    //! \param onnxModelFile Path to the ONNX model to load from disk.
    //!
    //! \return true if the model was loaded successfully, and if all the weights in the engine were refit successfully.
    //!
    //! The provided ONNX model must be identical to the one used to generate the engine
    //! that will be refit.
    //!
    virtual bool refitFromFile(char const* onnxModelFile) noexcept = 0;

    //!
    //!\brief Get the number of errors that occurred during prior calls to \p refitFromBytes or \p refitFromFile
    //!
    //! \see getError() IParserError
    //!
    virtual int32_t getNbErrors() const noexcept = 0;

    //!
    //!\brief Get an error that occurred during prior calls to \p refitFromBytes or \p refitFromFile
    //!
    //! \see getNbErrors() IParserError
    //!
    virtual IParserError const* getError(int32_t index) const noexcept = 0;

    //!
    //!\brief Clear errors from prior calls to \p refitFromBytes or \p refitFromFile
    //!
    //! \see getNbErrors() getError() IParserError
    //!
    virtual void clearErrors() = 0;

    virtual ~IParserRefitter() noexcept = default;

    //!
    //! \brief Load a serialized ONNX model into the parser. Unlike the refit(), or refitFromFile()
    //! functions, this function does not immediately begin the refit process. Using this function
    //! allows users to provide their own initializers for the ONNX model through the loadInitializer() function.
    //!
    //! Only one model can be loaded at a time. Subsequent calls to loadModelProto() will result in an error.
    //!
    //! To begin the refit process, use refitModelProto().
    //!
    //! \param serializedOnnxModel Pointer to the serialized ONNX model. Can be freed after this function returns.
    //! \param serializedOnnxModelSize Size of the serialized ONNX model in bytes.
    //! \param modelPath Absolute path to the model file for loading external weights if required.
    //! \return true if the model was loaded successfully
    //! \see getNbErrors() getError()
    //!
    virtual bool loadModelProto(

        void const* serializedOnnxModel, size_t serializedOnnxModelSize, char const* modelPath = nullptr) noexcept = 0;

    //!
    //! \brief Prompt the ONNX refitter to load an initializer with user-provided binary data.
    //! The lifetime of the data must exceed the lifetime of the refitter.
    //!
    //! All user-provided initializers must be provided prior to calling refitModelProto().
    //!
    //! This function can be called multiple times to specify the names of multiple initializers.
    //!
    //! Calling this function with an initializer previously specified will overwrite the previous instance.
    //!
    //! This function will return false if initializer validation fails. Possible validation errors are:
    //! * This function was called prior to loadModelProto()
    //! * The requested initializer was not found in the model.
    //! * The size of the data provided is different from the corresponding initializer in the model.
    //!
    //! \param name Name of the initializer.
    //! \param data Binary data containing the values of the initializer.
    //! \param size Size of the initializer in bytes.
    //! \return true if the initializer was loaded successfully
    //! \see loadModelProto()
    //!
    virtual bool loadInitializer(char const* name, void const* data, size_t size) noexcept = 0;

    //! \brief Begin the refit process from the loaded ONNX model.
    //!
    //! \return true if refit was successful
    //! \see getNbErrors() getError() loadModelProto()
    //!
    virtual bool refitModelProto() noexcept = 0;
};

} // namespace nvonnxparser

extern "C" TENSORRTAPI void* createNvOnnxParser_INTERNAL(void* network, void* logger, int version) noexcept;
extern "C" TENSORRTAPI void* createNvOnnxParserRefitter_INTERNAL(

    void* refitter, void* logger, int32_t version) noexcept;
extern "C" TENSORRTAPI int getNvOnnxParserVersion() noexcept;

namespace nvonnxparser
{

namespace
{

//!
//! \brief Create a new parser object
//!
//! \param network The network definition that the parser will write to
//! \param logger The logger to use
//! \return a new parser object or NULL if an error occurred
//!
//! Any input dimensions that are constant should not be changed after parsing,
//! because correctness of the translation may rely on those constants.
//! Changing a dynamic input dimension, i.e. one that translates to -1 in
//! TensorRT, to a constant is okay if the constant is consistent with the model.
//! Each instance of the parser is designed to only parse one ONNX model once.
//!
//! \see IParser
//!
inline IParser* createParser(nvinfer1::INetworkDefinition& network, nvinfer1::ILogger& logger) noexcept
{
    return static_cast<IParser*>(createNvOnnxParser_INTERNAL(&network, &logger, NV_ONNX_PARSER_VERSION));
}

//!
//! \brief Create a new ONNX refitter object
//!
//! \param refitter The Refitter object used to refit the model
//! \param logger The logger to use
//! \return a new ParserRefitter object or NULL if an error occurred
//!
//! \see IParserRefitter
//!
inline IParserRefitter* createParserRefitter(nvinfer1::IRefitter& refitter, nvinfer1::ILogger& logger) noexcept
{
    return static_cast<IParserRefitter*>(
        createNvOnnxParserRefitter_INTERNAL(&refitter, &logger, NV_ONNX_PARSER_VERSION));
}

} // namespace

} // namespace nvonnxparser

#endif // NV_ONNX_PARSER_H