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Horizon Smart Car Developer Community
Horizon Official Website
Guide
Horizon Smart Car Developer Community
Horizon Official Website
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The HBRuntime Inference Library

The HBRuntime is a x86-side model inference library provided by Horizon, which supports inference on the original ONNX models directly exported by commonly used training frameworks, the ONNX models at various stages generated during the PTQ conversion process of the Horizon toolchain, and the HBIR(*.bc) models generated during the Horizon toolchain conversion process. The usage flow is shown as follows:

model_inference

Usage

Reference usage when using HBRuntime for model inference is as follows:

import numpy as np # Load Horizon dependency library from horizon_tc_ui.hb_runtime import HBRuntime # Prepare the input for model running, here the `input.py` is the processed data data = np.load("input.npy") # Load model file, specify according to the actual model # ONNX model sess = HBRuntime("model.onnx") # HBIR model sess = HBRuntime("model.bc") # Obtain the model input & output node information input_names = sess.input_names output_names = sess.output_names # Prepare the input data according to the actual input type and layout # The format needs to be the dict, where the input name and input data form a key-value pair # If the model has only one input input_feed = {input_names[0]: data} # If the model has multi inputs input_feed = {input_names[0]: data1, input_names[1]: data2} # Model inference, the return value is a list that corresponds in order to the names specified by output_names output = sess.run(output_names, input_feed)
Note
  • output_names: used to specify the output name, support to specify as None or custom configuration. If there are no special requirements, here we recommend you to set it to None.
    • Specify as None, the tool will internally read the information of the output nodes in the model and give the inference result in the order of parsing.
    • If you customize the configuration, you can specify full or partial output_name and support modifying the order of outputs. Then, when the inference is complete, the output will be returned according to the output name and order that you specified.
  • input_feed: Used to configure the inputs for the model running, which need to be prepared according to the input type and layout. The format needs to be the dict, where the input name and input data form a key-value pair

In addition, HBRuntime supports you to view model attribute information during usage, the following model attribute information is supported to be viewed. For example, if you want to print to see the model input number, you can use print(f"input_num: {sess.input_num}").

model_attributeDESCRIPTION
input_numNumber of model input
output_numNumber of model output
input_namesNames of model input
output_namesNames of model output
input_typesTypes of model input
output_typesTypes of model output
input_shapesShapes of model input
ouput_shapesShapes of model output

Usage Example

In the following, we provide you with the usage examples of HBRuntime for two scenarios, ONNX model inference and HBIR model inference, respectively.

ONNX Model Inference

The basic flow for loading ONNX model inference using HBRuntime is shown below, and this sample code applies to inference for all ONNX models. Prepare the data according to the input type and layout requirements of different models:

import numpy as np # Load Horizon dependency library from horizon_tc_ui.hb_runtime import HBRuntime # Prepare the input for model running, here the `input.py` is the processed data data = np.load("input.npy") # Load model file sess = HBRuntime("model.onnx") # Obtain the model input node information input_names = sess.input_names # Model inference, here we assume the model has only one input output = sess.run(None, {input_names[0]: data})

HBIR Model Inference

The basic flow for loading HBIR model inference using HBRuntime is shown below, and this sample code applies to inference for all HBIR models. Prepare the data according to the input type and layout requirements of different models:

import numpy as np # Load Horizon dependency library from horizon_tc_ui.hb_runtime import HBRuntime # Prepare the input for model running, here the `input.py` is the processed data data = np.load("input.npy") # Load model file sess = HBRuntime("model.bc") # Obtain the model input node information input_names = sess.input_names # Model inference, here we assume the model has only one input output = sess.run(None, {input_names[0]: data})