Onnx Parser

class tensorrt.OnnxParser(self: tensorrt.tensorrt.OnnxParser, network: tensorrt.tensorrt.INetworkDefinition, logger: tensorrt.tensorrt.ILogger) → None

This class is used for parsing ONNX models into a TensorRT network definition

Variables

num_errors – int The number of errors that occurred during prior calls to parse()

Parameters

network – The network definition to which the parser will write.
logger – The logger to use.

__del__(self: tensorrt.tensorrt.OnnxParser) → None

__exit__(exc_type, exc_value, traceback): Context managers are deprecated and have no effect. Objects are automatically freed when the reference count reaches 0.

__init__(self: tensorrt.tensorrt.OnnxParser, network: tensorrt.tensorrt.INetworkDefinition, logger: tensorrt.tensorrt.ILogger) → None

Parameters

network – The network definition to which the parser will write.
logger – The logger to use.

clear_errors(self: tensorrt.tensorrt.OnnxParser) → None: Clear errors from prior calls to parse()

clear_flag(self: tensorrt.tensorrt.OnnxParser, flag: nvonnxparser::OnnxParserFlag) → None

Clears the parser flag from the enabled flags.

Parameters: flag – The flag to clear.

get_error(self: tensorrt.tensorrt.OnnxParser, index: int) → nvonnxparser::IParserError

Get an error that occurred during prior calls to parse()

Parameters: index – Index of the error

get_flag(self: tensorrt.tensorrt.OnnxParser, flag: nvonnxparser::OnnxParserFlag) → bool

Check if a build mode flag is set.

Parameters: flag – The flag to check.
Returns: A bool indicating whether the flag is set.

get_layer_output_tensor(self: tensorrt.tensorrt.OnnxParser, name: str, i: int) → tensorrt.tensorrt.ITensor

Get the i-th output ITensor object for the ONNX layer “name”.

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.

arg name

The name of the ONNX layer.

arg i

The index of the output.

returns

The output tensor or None if the layer was not found or an invalid index was provided.

get_subgraph_nodes(self: tensorrt.tensorrt.OnnxParser, index: int) → list

Get the nodes of the specified subgraph. Calling before p supportsModelV2 is an undefined behavior. Will return an empty list by default.

Parameters: index – Index of the subgraph.
Returns: List[int] A list of node indices in the subgraph.

get_used_vc_plugin_libraries(self: tensorrt.tensorrt.OnnxParser) → List[str]

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.set_plugins_to_serialize() 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.load_library() is used to load these libraries in the appropriate runtime before deserializing the corresponding engine.

Returns: List[str] List of plugin libraries found by the parser.
Raises: RuntimeError if an internal error occurred when trying to fetch the list of plugin libraries.

is_subgraph_supported(self: tensorrt.tensorrt.OnnxParser, index: int) → bool

Returns whether the subgraph is supported. Calling before p supportsModelV2 is an undefined behavior. Will return false by default.

Parameters: index – Index of the subgraph to be checked.
Returns: true if subgraph is supported

parse(self: tensorrt.tensorrt.OnnxParser, model: buffer, path: str = None) → bool

Parse a serialized ONNX model into the TensorRT network.

Parameters

model – The serialized ONNX model.
path – The path to the model file. Only required if the model has externally stored weights.

Returns

true if the model was parsed successfully

parse_from_file(self: tensorrt.tensorrt.OnnxParser, model: str) → bool

Parse an ONNX model from file into a TensorRT network.

Parameters: model – The path to an ONNX model.
Returns: true if the model was parsed successfully

parse_with_weight_descriptors(self: tensorrt.tensorrt.OnnxParser, model: buffer) → bool

Parse a serialized ONNX model into the TensorRT network with consideration of user provided weights.

Parameters: model – The serialized ONNX model.
Returns: true if the model was parsed successfully

set_flag(self: tensorrt.tensorrt.OnnxParser, flag: nvonnxparser::OnnxParserFlag) → None

Add the input parser flag to the already enabled flags.

Parameters: flag – The flag to set.

supports_model(self: tensorrt.tensorrt.OnnxParser, model: buffer, path: str = None) → Tuple[bool, List[Tuple[List[int], bool]]]

[DEPRECATED] Deprecated in TensorRT 10.1. See supports_model_v2.

Check whether TensorRT supports a particular ONNX model.

Parameters

model – The serialized ONNX model.
path – The path to the model file. Only required if the model has externally stored weights.

Returns

Tuple[bool, List[Tuple[NodeIndices, bool]]] The first element of the tuple indicates whether the model is supported. The second indicates subgraphs (by node index) in the model and whether they are supported.

supports_model_v2(self: tensorrt.tensorrt.OnnxParser, model: buffer, path: str = None) → bool

Check whether TensorRT supports a particular ONNX model. Query each subgraph with num_subgraphs, is_subgraph_supported, get_subgraph_nodes.

Parameters

model – The serialized ONNX model.
path – The path to the model file. Only required if the model has externally stored weights.

Returns

true if the model is supported

supports_operator(self: tensorrt.tensorrt.OnnxParser, op_name: str) → bool

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).

Parameters: op_name – The name of the ONNX operator to check for support

class tensorrt.OnnxParserRefitter(self: tensorrt.tensorrt.OnnxParserRefitter, refitter: tensorrt.tensorrt.Refitter, logger: tensorrt.tensorrt.ILogger) → None

This is an interface designed to refit weights from an ONNX model.

Parameters

refitter – The Refitter object used to refit the model.
logger – The logger to use.

__init__(self: tensorrt.tensorrt.OnnxParserRefitter, refitter: tensorrt.tensorrt.Refitter, logger: tensorrt.tensorrt.ILogger) → None

Parameters

refitter – The Refitter object used to refit the model.
logger – The logger to use.

clear_errors(self: tensorrt.tensorrt.OnnxParserRefitter) → None: Clear errors from prior calls to refitFromBytes() or refitFromFile().

get_error(self: tensorrt.tensorrt.OnnxParserRefitter, index: int) → tensorrt.tensorrt.ParserError

Get an error that occurred during prior calls to refitFromBytes() or refitFromFile().

Parameters: index – Index of the error

refit_from_bytes(self: tensorrt.tensorrt.OnnxParserRefitter, model: buffer, path: str = None) → bool

Load a serialized ONNX model from memory and perform weight refit.

Parameters

model – The serialized ONNX model.
path – The path to the model file. Only required if the model has externally stored weights.

Returns

true if all the weights in the engine were refit successfully.

refit_from_file(self: tensorrt.tensorrt.OnnxParserRefitter, model: str) → bool

Load and parse a ONNX model from disk and perform weight refit.

Parameters: model – The path to an ONNX model.
Returns: true if the model was loaded successfully, and if all the weights in the engine were refit successfully.

tensorrt.ErrorCode

The type of parser error

Members:

SUCCESS

INTERNAL_ERROR

MEM_ALLOC_FAILED

MODEL_DESERIALIZE_FAILED

INVALID_VALUE

INVALID_GRAPH

INVALID_NODE

UNSUPPORTED_GRAPH

UNSUPPORTED_NODE

UNSUPPORTED_NODE_ATTR

UNSUPPORTED_NODE_INPUT

UNSUPPORTED_NODE_DATATYPE

UNSUPPORTED_NODE_DYNAMIC

UNSUPPORTED_NODE_SHAPE

REFIT_FAILED