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Python Runtime for ONNX models, other helpers to convert machine learned models in C++.

Project description


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The packages explores ways to productionize machine learning predictions. One approach uses ONNX and tries to implement a runtime in python / numpy or wraps onnxruntime into a single class. The package provides tools to compare predictions, to benchmark models converted with sklearn-onnx. The second approach consists in converting a pipeline directly into C and is not much developed.

from sklearn.linear_model import LinearRegression
from sklearn.datasets import load_iris
from mlprodict.onnxrt import OnnxInference, measure_relative_difference
import numpy

iris = load_iris()
X =[:, :2]
y =
lr = LinearRegression(), y)

# Predictions with scikit-learn.
expected = lr.predict(X[:5])

# Conversion into ONNX.
from mlprodict.onnx_conv import to_onnx
model_onnx = to_onnx(lr, X.astype(numpy.float32))

# Predictions with onnxruntime
oinf = OnnxInference(model_onnx, runtime='onnxruntime1')
ypred ={'X': X[:5]})

# Measuring the maximum difference.
print(measure_relative_difference(expected, ypred))


The project relies on sklearn-onnx which is in active development. Continuous integration relies on a specific branch of this project to benefit from the lastest changes:

pip install git+

The project is currently in active development. It is safer to install the package directly from github:

pip install git+

On Linux and Windows, the package must be compiled with openmp. Full instructions to build the module and run the documentation are described in config.yml for Linux. When this project becomes more stable, it will changed to be using official releases. Experiments with float64 are not supported with sklearn-onnx <= 1.5.0. The code is available at GitHub/mlprodict and has online documentation.


current - 2019-09-15 - 0.00Mb

  • 57: ONNX: handles dataframe when converting a model (2019-09-15)
  • 56: ONNX: implements cdist operator (2019-09-12)
  • 54: ONNX: fix summary, it produces multiple row when model are different when opset is different (2019-09-12)
  • 51: ONNX: measure the time performance obtained by using optimization (2019-09-11)
  • 52: ONNC-cli: add a command line to optimize an onnx model (2019-09-10)
  • 49: ONNX optimization: remove redundant subparts of a graph (2019-09-09)
  • 48: ONNX optimization: reduce the number of Identity nodes (2019-09-09)
  • 47: Implements statistics on onnx graph and sklearn models, add them to the documentation (2019-09-06)
  • 46: Implements KNearestNeibhorsRegressor supporting batch mode (ONNX) (2019-08-31)
  • 45: KNearestNeighborsRegressor (2019-08-30)
  • 44: Add an example to look into the performance of every node for a particular dataset (2019-08-30)
  • 43: LGBMClassifier has wrong shape (2019-08-29)

0.2.452 - 2019-08-28 - 0.13Mb

  • 42: Adds a graph which visually summarize the validating benchmark (ONNX). (2019-08-27)
  • 41: Enables to test multiple number of features at the same time (ONNX) (2019-08-27)
  • 40: Add a parameter to change the number of featuress when validating a model (ONNX). (2019-08-26)
  • 39: Add a parameter to dump all models even if they don’t produce errors when being validated (ONNX) (2019-08-26)
  • 24: support double for TreeEnsembleClassifier (python runtime ONNX) (2019-08-23)
  • 38: See issue on onnxmltools. (2019-08-19)
  • 35: Supports parameter time_kwargs in the command line (ONNX) (2019-08-09)
  • 34: Add intervals when measuring time ratios between scikit-learn and onnx (ONNX) (2019-08-09)
  • 31: Implements shape inference for the python runtime (ONNX) (2019-08-06)
  • 15: Tells operator if the execution can be done inplace for unary operators (ONNX). (2019-08-06)
  • 27: Bug fix (2019-08-02)
  • 23: support double for TreeEnsembleRegressor (python runtime ONNX) (2019-08-02)

0.2.363 - 2019-08-01 - 0.11Mb

  • 26: Tests all converters in separate processeses to make it easier to catch crashes (2019-08-01)
  • 25: Ensures operator clip returns an array of the same type (ONNX Python Runtime) (2019-07-30)
  • 22: Implements a function to shake an ONNX model and test float32 conversion (2019-07-28)
  • 21: Add customized converters (2019-07-28)
  • 20: Enables support for TreeEnsemble operators in python runtime (ONNX). (2019-07-28)
  • 19: Enables support for SVM operators in python runtime (ONNX). (2019-07-28)
  • 16: fix documentation, visual graph are not being rendered in notebooks (2019-07-23)
  • 18: implements python runtime for SVM (2019-07-20)

0.2.272 - 2019-07-15 - 0.09Mb

  • 17: add a mechanism to use ONNX with double computation (2019-07-15)
  • 13: add automated benchmark of every scikit-learn operator in the documentation (2019-07-05)
  • 12: implements a way to measure time for each node of the ONNX graph (2019-07-05)
  • 11: implements a better ZipMap node based on dedicated container (2019-07-05)
  • 8: implements runtime for decision tree (2019-07-05)
  • 7: implement python runtime for scaler, pca, knn, kmeans (2019-07-05)
  • 10: implements full runtime with onnxruntime not node by node (2019-06-16)
  • 9: implements a onnxruntime runtime (2019-06-16)
  • 6: first draft of a python runtime for onnx (2019-06-15)
  • 5: change style highlight-ipython3 (2018-01-05)

0.1.11 - 2017-12-04 - 0.03Mb

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